Layered Lithium Cobalt-Oxide Battery Cathode
Full Analysis

Invention Disclosure Review

Layered Lithium Cobalt-Oxide Battery Cathode

Generated
Jul 20, 2026

Generated on a public invention disclosure — no confidential material involved. First-pass analysis — not an opinion of counsel or drafted claims.

1.

Cross-Domain Application Map

Rechargeable batteries (portable electronics, electric vehicles) — High-voltage layered transition-metal oxide positive electrode for secondary lithium cells, operated over the deep-extraction composition window.

This is the demonstrated embodiment of the generalized function: reversible cation extraction/insertion in a layered host stores charge, and because the host is an oxide the cell voltage steps up markedly versus a chalcogenide host, delivering high energy density. The measured voltage, sustained current density, and cation diffusion coefficient directly support a practical high-rate cathode. This is the lead filing target and the location of the closest, most threatening prior art (chalcogenide intercalation electrodes).

Evidence: data_backed · Application distance: near

Grid-scale and stationary energy storage — Layered oxide cathode operated with sodium or potassium as the mobile intercalant for lower-cost, abundance-driven stationary cells.

The same interlayer insertion/extraction mechanism and vacancy-governed capacity apply when the mobile alkali cation is Na or K, which the disclosure explicitly names. The value proposition (abundant, cheap alkali source) targets a distinct commercial need where lithium scarcity matters, even though the underlying charge-storage function is identical.

Evidence: described_not_demonstrated · Application distance: near

Materials synthesis / solid-state chemistry (method asset) — Low-temperature electrochemical extraction (and re-insertion) as a general topotactic route to metastable cation-deficient phases that thermal synthesis cannot produce, applied to host families beyond the lead oxide.

The core enabling insight is that electrochemistry, not heat, creates and stabilizes an otherwise-inaccessible vacancy-rich phase while preserving the host framework. As a synthesis platform this decouples target composition from thermal stability limits, which is broadly valuable for making metastable functional materials (catalysts, magnets, correlated-electron phases) that decompose at preparative temperatures. Filed as a process, it can reach well past batteries.

Evidence: speculative · Application distance: adjacent

Thermoelectric energy conversion / waste-heat harvesting — Alkali-deficient layered transition-metal oxide as a high-temperature thermoelectric (Seebeck) material whose carrier concentration is tuned by controlling alkali/vacancy content.

The disclosure's central material relationship — vacancy concentration governs electronic properties — is exactly the knob that sets carrier density and thermopower in layered cobaltate-type oxides. Here the function is repurposed to convert a temperature gradient into voltage rather than to store charge, and the electrochemical route offers vacancy control finer than thermal doping. This is a composition-repurposing target an origin-field cathode practitioner would not list.

Evidence: speculative · Application distance: far

Electrocatalysis / green hydrogen and fuel production — Deeply extracted (alkali-deficient) layered cobalt/nickel oxide surfaces as oxygen-evolution-reaction catalysts for water electrolysis.

Extracting alkali raises the transition-metal oxidation state and creates high-valent oxide surface sites; the same vacancy-creation function that raises cell voltage also produces the electron-deficient metal centers associated with catalytic oxygen evolution. The electrochemical route both generates and can regenerate the active alkali-deficient surface. A separately filable far-field use of the substance itself.

Evidence: speculative · Application distance: far

Solid oxide fuel cells / gas separation — Layered transition-metal oxide as a mixed ionic-electronic conductor for a fuel-cell air electrode or an oxygen-transport membrane.

The disclosure characterizes the material as a fast-ion conductor with high electronic conductivity; that combination of rapid cation transport and electronic conduction is precisely what enables surface oxygen exchange and bulk transport in mixed-conductor electrodes/membranes. The function is redeployed for gas conversion/separation rather than charge storage.

Evidence: speculative · Application distance: far

2.

Claim Architecture

The claim-level view (the primary analysis): the broadest defensible claim is on the mechanism itself — it covers every use — while a standalone same-mechanism application claim is weak. This is engineering work-product / a scaffold for counsel, NOT drafted claims or a patentability conclusion. Grounded in the prior art available to this report; confirm against a full search before relying on it.

Broadest mechanism (the dominating claim): A metastable, alkali-cation-deficient layered oxide of the form A_xM_yO2 (A = Li, Na, or K mobile intercalant; M = redox-active transition metal such as Co or Ni; y approximately 1) adopting the rhombohedral alpha-NaCrO2 layered structure, in which the mobile-cation content x is held substantially below 1 (down to roughly 0.067, preferred operating band ~0.2-0.8) with the layered host framework retained across that deep-extraction range, together with the low-temperature electrochemical route (extraction of A+ from a stoichiometric parent oxide) that creates the cation-vacancy population governing cell voltage and capacity — a phase not obtainable by conventional high-temperature synthesis.

Composition claim set

Covers: A_x M_y O2 composition with layered alpha-NaCrO2 (rhombohedral) structure, Alkali-deficient layered oxide phase (x substantially less than 1), Composition window x ~= 0.067 to ~1 (preferred x ~= 0.2 to 0.8); y approximately 1, Li_0.99 Co_1.01 O2 example phase, Li_0.85 Ni_1.15 O2 example phase, Metastable alkali-deficient phase inaccessible by conventional high-temperature synthesis, Layered oxide host framework preserved across deep-delithiation composition range

Closest prior art: D2 (alpha-NaCrO2 prototype layered structure) read with CN107273559B, which lists stoichiometric LiCoO2 and LiNiO2 among candidate cathode materials (verify)

Distinguishing limitation: The composition claimed is the cation-DEFICIENT metastable phase in which x is held substantially below 1 (down to ~0.067) with the alpha-NaCrO2 layered framework retained; D2 discloses only the prototype structure and the cited references address the stoichiometric (x≈1) parent oxide, not a stable vacancy-bearing composition across the deep-extraction window

Standard: §102/§103 (for counsel to assess)

Process claim set

Covers: Electrochemical extraction of A+ cations at low temperature to create A+ vacancies, Stoichiometric parent oxide LiCoO2 as starting material, Metastable alkali-deficient phase inaccessible by conventional high-temperature synthesis, Composition window x ~= 0.067 to ~1

Closest prior art: D3 (conventional high-temperature synthesis of layered oxides, expressly noted as unable to produce the alkali-deficient phases); modern delithiation-mechanism papers (e.g., 'Electrochemically Driven Phase Transition in LiCoO2', 'Sustainable LiCoO2 by collective glide of CoO6 slabs')

Distinguishing limitation: Producing the metastable cation-deficient host by LOW-TEMPERATURE electrochemical extraction of A+ from a stoichiometric parent, rather than by thermal/solid-state synthesis; D3 is the high-temperature route the disclosure identifies as incapable of reaching these vacancy concentrations. (Counsel should note the retrieved delithiation papers describe the same electrochemical route and must be assessed for date/priority.)

Standard: §102/§103 (for counsel to assess)

Structure claim set

Covers: Transition metal M (e.g., Co or Ni) as the redox-active framework cation, Alkali cation A = Li, Na, or K as the mobile intercalant, Alkali-deficient layered oxide phase (x substantially less than 1) as intercalation electrode, Chemical diffusion coefficient of mobile cation ~5e-9 cm^2/s, Sustained current density up to ~4 mA/cm^2

Closest prior art: D1 (Li_aTiS2 chalcogenide intercalation electrode — the baseline comparator)

Distinguishing limitation: The electrode active material is the alkali-deficient layered OXIDE host (A_xM_yO2, alpha-NaCrO2) rather than a chalcogenide (TiS2) framework. Rest the distinction on the oxide host/redox-metal framework itself, NOT on the headline 'roughly twice the OCV of TiS2' figure — the voltage is a downstream consequence of the oxide chemistry, so the durable limitation is the layered transition-metal-oxide intercalation host that D1 does not disclose

Standard: §103 obviousness (for counsel to assess)

Method-of-use claim set

Covers: Reversible A+ intercalation/deintercalation as charge-storage mechanism, Preferred operating composition window x ~= 0.2 to 0.8 for cycle life with structural stability, Layered oxide host framework preserved across deep-delithiation composition range

Closest prior art: D1 (reversible cation intercalation/deintercalation cycling in Li_aTiS2)

Distinguishing limitation: Reversible cycling within a deep cation-deficient window (x ~0.2-0.8) while maintaining the alpha-NaCrO2 layered oxide framework. This set is the weakest as a standalone use claim (reversible intercalation cycling is itself known from D1); its independent weight depends on whether operating within the deep-extraction window on this oxide host required non-obvious adaptation — for counsel to assess. Better pursued as dependent on the composition/structure sets

Standard: §103 obviousness (for counsel to assess)

3.

Novelty & Nonobviousness Stress Test

Inventive-Step Stress Test

The adversarial pass: the strongest case AGAINST the moat, so counsel sees the threats before an examiner or opponent does. Challenges rest only on the prior art available to this report; inventor-asserted premises are checked against that art rather than repeated as fact. Engineering work-product — it names §102/§103, it does not conclude.

The gravest threat is priority/date, not subject-matter novelty. On the merits, the retrieved record squarely occupies almost every distinguishing limitation: deep electrochemical delithiation of LiCoO2 to vacancy-rich LixCoO2 (down to x=0, CoO2), the low-temperature electrochemical extraction route, the layered-oxide host, and reversible cycling are all described in the second-round art (and the oxide host is flagged by D2 + CN107273559B). If those 2001-2022 references post-date the effective filing date — plausible if this is the foundational electrochemically-delithiated LiCoO2 concept — they are not prior art and the moat is intact; if they pre-date or the priority chain is weak, the composition, process, and structure sets face substantial §102/§103 pressure. Independently, two inventor premises are affirmatively CONTRADICTED by the provided art regardless of date logic if the examiner uses them as admissions/background: 'framework preserved to x=0.067' and 'structurally stable across the deep-delithiation range' are refuted by a consistent degradation/phase-transition literature (rock-salt transformation, CoO6-slab gliding, delithiation damage), which is precisely why the disclosure retreats to a preferred 0.2-0.8 window. The strongest SURVIVING position for the attorney: (1) anchor validity on the priority date and force any challenger to prove their references are prior art; and (2) narrow the durable claim to reversible cycling within the intermediate deficient window (~0.2-0.8) on the specific O3/alpha-NaCrO2 oxide host produced by low-temperature extraction — abandon reliance on the full 0.067 extreme, the raw 'twice-TiS2 voltage' figure, and the two contradicted stability premises, none of which the provided art will support and the last two of which it affirmatively undercuts.

Strongest challenges to the distinguishing limitations

  • Composition: cation-deficient metastable Li_xCoO2 (x substantially below 1, down to ~0.067) with the alpha-NaCrO2 (O3) layered framework retained across the deep-extraction window — substantial — counsel must weigh

    • Multiple second-round references disclose exactly this vacancy-bearing composition family produced across the deep-extraction range. 'Electronic phase diagram of LixCoO2 revisited with potentiostatically de-intercalated single crystals' maps LixCoO2 across the composition range; 'Structure and electron density analysis of electrochemically and chemically delithiated LiCoO2 single crystals' characterizes the deficient layered phase; 'Electrochemical synthesis and properties of CoO2, the x=0 phase of the AxCoO2 systems (A=Li,Na)' reaches x=0 as a bulk single phase; 'Lithium Electrochemical Deintercalation from O2-LiCoO2' reaches Li0.15CoO2 with single-phase domains characterized by XRD. On the merits these bear directly on the deep-deficiency composition (§102/§103 — for counsel to weigh). The decisive question is priority: this disclosure appears to be the foundational electrochemically-delithiated LiCoO2 concept and these references are dated 2001-2022; if they post-date the effective filing date they fall away entirely, and counsel must resolve dates before crediting them.
    • Rests on: Electronic phase diagram of LixCoO2 revisited (single crystals); Electrochemical synthesis of CoO2 x=0 phase of AxCoO2 (A=Li,Na); Lithium Electrochemical Deintercalation from O2-LiCoO2; Structure and electron density analysis of delithiated LiCoO2 single crystals (provenance: verify_full_doc)

  • Process: producing the metastable cation-deficient host by low-temperature electrochemical extraction of A+ from a stoichiometric parent, rather than by thermal/solid-state synthesis — substantial — counsel must weigh

    • 'Electrochemical synthesis and properties of CoO2, the x=0 phase of the AxCoO2 systems (A=Li,Na)' and 'Electrochemical De-intercalation... NaxCoO2-δ' describe the identical low-temperature electrochemical extraction route yielding metastable deficient phases not obtained by conventional thermal synthesis. 'Soft Chemistry Synthesis and Characterization of Layered Li1-xNi1-yCoyO2-δ (0≤x≤1)' further shows deficient layered phases obtained by a low-temperature (soft-chemistry/chemical) route — which weakens any argument that the ELECTROCHEMICAL route specifically is the only path to the deficient phase. On the merits these bear directly on the process limitation (§102/§103 — for counsel to weigh), again subject to the same priority-date caveat.
    • Rests on: Electrochemical synthesis of CoO2 x=0 phase of AxCoO2 (A=Li,Na); Electrochemical De-intercalation of NaxCoO2-δ; Soft Chemistry Synthesis of Layered Li1-xNi1-yCoyO2-δ (provenance: verify_full_doc)

  • Structure: the active material is a layered transition-metal OXIDE host (A_xM_yO2, alpha-NaCrO2) rather than a chalcogenide (TiS2) — substantial — counsel must weigh

    • D2 supplies the alpha-NaCrO2 prototype layered structure; CN107273559B expressly lists stoichiometric LiCoO2 and LiNiO2 (and other layered oxides) as cathode candidates alongside LiTiS2, treating the layered oxide as a known intercalation host. The many delithiation papers (e.g., 'Electrochemically Driven Phase Transition in LiCoO2') all treat layered LiCoO2 as a standard oxide intercalation cathode. On the merits the layered-oxide host itself is disclosed (§102/§103 — for counsel to weigh); the distinction, if any, therefore cannot rest on 'oxide vs. chalcogenide' generically but on the specific deep-deficiency composition/state. CN107273559B is modern and must be date-checked.
    • Rests on: D2 (alpha-NaCrO2 prototype); CN107273559B (lists LiCoO2, LiNiO2 as cathode materials) (verify) (provenance: verify_full_doc)

  • Method of use: reversible cycling within a deep cation-deficient window (x ~0.2-0.8) while maintaining the alpha-NaCrO2 layered oxide framework — substantial — counsel must weigh

    • Reversible intercalation/deintercalation cycling is disclosed by D1 (Li_aTiS2) as the baseline mechanism, and 'Lithium Electrochemical Deintercalation from O2-LiCoO2' and the LixCoO2 phase-diagram work show reversible sheet-gliding/vacancy-ordering cycling in the oxide itself. As a standalone use claim this adds little over D1. Separately, several references cut AGAINST the 'maintained framework' element (see premise audit): degradation and phase-change papers show structural damage on deep extraction. Best pursued as dependent on the composition/structure sets (§102/§103 — for counsel to weigh).
    • Rests on: D1 (reversible cycling in Li_aTiS2); Lithium Electrochemical Deintercalation from O2-LiCoO2; Electrochemically Driven Phase Transition in LiCoO2 (provenance: verify_full_doc)

Inventor-asserted premises, checked against the art

  • Substantially alkali-deficient layered oxide phases (x << 1) cannot be made by conventional high-temperature synthesis because they are thermally unstable at preparative temperatures (industry_norm) — supported by the provided art

    • 'Synthesis and characterization of nonstoichiometric LiCoO2' notes the ordered layered ion arrangement is not easily perturbed under usual synthetic conditions, and the deficient/x=0 phases in the record are made by electrochemical or soft-chemistry (low-temperature) routes ('Electrochemical synthesis of CoO2 x=0'; 'Soft Chemistry Synthesis of Li1-xNi1-yCoyO2-δ'), consistent with high-temperature routes not reaching deep deficiency. Caveat for counsel: 'Structural Phase Transition... Li overstoichiometric Li1+δCo1-δO2' concerns Li-EXCESS (not deficient) made at high temperature, and does not corroborate the deficient-phase claim.

  • Low-temperature electrochemical extraction produces a metastable A-deficient phase inaccessible by high-temperature routes, and this metastable phase enables the high-voltage reversible cathode (other) — contradicted by the provided art

    • Partly supported as to route but undermined as to uniqueness: 'Soft Chemistry Synthesis of Layered Li1-xNi1-yCoyO2-δ (0≤x≤1)' obtains the deficient layered phase by a low-temperature CHEMICAL (non-electrochemical) route, and 'Ion-Exchange... Li-Rich/Li-Excess Layered Cathodes' shows soft-chemistry tuning of alkali content — so the specifically ELECTROCHEMICAL extraction is not the sole path to the metastable deficient phase. The 'inaccessible by high-temperature' part remains supported; the 'electrochemical route is what enables it' framing is weakened.

  • Open-circuit voltage is roughly twice that of a comparable Li_aTiS2 chalcogenide electrode, a step-change in cell voltage/energy density (performance_target) — uncorroborated (inventor-asserted; not shown by the provided art)

    • Only D1 (the inventor's own comparator) is provided; no independent measurement in the record confirms the ~2x ratio. More importantly the higher voltage is a downstream consequence of choosing an oxide (Co3+/4+) rather than a sulfide (Ti) host — it is inherent to the chemistry choice, not an independently engineered feature (see metric scrutiny). Counsel would want an independent OCV comparison to corroborate the ratio.

  • Sustained current density up to ~4 mA/cm^2 (performance_target) — uncorroborated (inventor-asserted; not shown by the provided art)

    • No provided reference reports a current-density figure for this or comparable systems; the value is cell/electrode-configuration dependent and not shown to be intrinsic to the deficient composition. Nothing in the record either confirms or refutes it.

  • Chemical diffusion coefficient of the mobile cation ~5e-9 cm^2/s (performance_target) — uncorroborated (inventor-asserted; not shown by the provided art)

    • CN107273559B computes Li-ion diffusivity generically for candidate cathodes but no provided reference reports a numerical diffusion coefficient for LixCoO2 to compare against. The specific figure is neither corroborated nor refuted by the provided art.

  • Electrochemical extraction demonstrated down to x ~= 0.067 while preserving the layered host framework (performance_target) — contradicted by the provided art

    • Deep extraction is achievable ('Lithium Electrochemical Deintercalation from O2-LiCoO2' to Li0.15; 'Electrochemical synthesis of CoO2 x=0'), but 'preservation of the framework' at those depths is refuted: 'Origin of performance degradation in high-delithiation LixCoO2', 'A multi-technique approach to understanding delithiation damage in LiCoO2 thin films', 'Electrochemically Driven Phase Transition in LiCoO2', and 'Structural Distortion-Induced Charge Gradient... Delithiated LiCoO2' document phase transitions and structural damage on deep delithiation. Note the O2-LiCoO2 deintercalation paper concerns the O2 polytype, not the O3/alpha-NaCrO2 framework claimed.

  • The layered oxide framework remains structurally stable across the deep-delithiation range, giving reversible cycling over many cycles (comparative_advantage) — contradicted by the provided art

    • Directly opposed by the retrieved degradation/phase-transition record: 'Layered-to-Rock-Salt Transformation in Desodiated NaxCrO2 (x<0.4)', 'Comparison of the chemical and structural instabilities of Na0.75-xCoO2 and Li1-xCoO2', 'Origin of performance degradation in high-delithiation LixCoO2', and 'Sustainable LiCoO2 by collective glide of CoO6 slabs' all show that deep extraction drives phase changes/instability — which is why the disclosure itself falls back to a narrower preferred window (~0.2-0.8). Stability across the FULL deep range down to 0.067 is not supported; stability within the narrower window may survive and is the defensible position.

Performance-metric scrutiny

  • Open-circuit voltage roughly twice that of Li_aTiS2 — trivially satisfied by a conventional element — not where the novelty lives

    • Why: The higher voltage follows automatically from choosing an oxide host with a high-potential Co3+/4+ (or Ni) redox couple instead of the lower-potential Ti/sulfide couple of TiS2; it is a consequence of the host chemistry, not a separately engineered result. CN107273559B and D2 already treat layered oxides as known high-voltage hosts.
    • Metric that actually distinguishes the invention: Reversible capacity retained per cycle and structural integrity across the deep cation-deficient window — i.e., how much of the deep-extraction range is actually cyclable without framework collapse, not the raw voltage ratio.

  • Sustained current density up to ~4 mA/cm^2 — trivially satisfied by a conventional element — not where the novelty lives

    • Why: Achievable current density is dominated by electrode/cell engineering (loading, area, electrolyte, thickness), not by the deficient composition per se; a thin/high-area test electrode makes such a figure attainable independent of the claimed novelty.
    • Metric that actually distinguishes the invention: Rate capability normalized to active-material intrinsic kinetics (the diffusion coefficient) at deep state of charge, and its retention over cycling.

  • Chemical diffusion coefficient ~5e-9 cm^2/s — carries weight

    • Metric that actually distinguishes the invention: Whether the diffusion coefficient (and hence rate) is MAINTAINED across the deep-deficiency window where the degradation papers report kinetic and structural deterioration.
4.

Claim Outline

Claim Scaffold

A drafting scaffold for counsel — plain-language claim CONCEPTS and fallback positions to turn into claims, NOT drafted claims and NOT legal advice. The broadest claim is on the mechanism (it covers every use); each dependent rung is a narrower fallback if the independent claim is narrowed. Every item is tagged by the disclosure support behind it (§112).

Independent claim — Composition

Concept: A metastable, alkali-cation-deficient layered oxide matter of the general form A_xM_yO2, where A is a mobile alkali intercalant selected from lithium, sodium, or potassium, M is a redox-active transition metal such as cobalt or nickel, and y is approximately one, the material adopting the rhombohedral alpha-NaCrO2 layered structure and having its mobile-cation content x held substantially below one across a deep-extraction range (down to roughly 0.067) while the layered host framework is retained — a vacancy-bearing phase distinguished from the stoichiometric (x near one) parent oxide. (§112 support: data-backed)

Core elements: A_x M_y O2 composition with layered alpha-NaCrO2 (rhombohedral) structure, Alkali-deficient layered oxide phase (x substantially less than 1), y approximately equal to 1, Layered oxide host framework preserved across deep-delithiation composition range, Metastable alkali-deficient phase inaccessible by conventional high-temperature synthesis

Dependent ladder (broad → narrow):

  • A restricted to lithium as the mobile intercalant and M a first-row redox-active transition metal (cobalt or nickel) — narrows the alkali genus to the demonstrated lithium chemistry while still covering both worked cathode families (§112 support: data-backed)
  • the mobile-cation content x confined to the preferred operating band of roughly 0.2 to 0.8 — captures the commercially meaningful cycling window that maintains structural stability of the layered framework (§112 support: described, no data)
  • the specific delithiated cobalt-oxide phase corresponding to a parent of composition near Li_0.99Co_1.01O2 driven to deep lithium deficiency (x down to ~0.067) — covers the single fully characterized worked example and the deepest demonstrated extraction endpoint (§112 support: data-backed)
  • the nickel-oxide analog derived from a parent of composition near Li_0.85Ni_1.15O2 — covers the second named cathode embodiment as a commercially distinct active material (§112 support: described, no data)
  • A being sodium or potassium in the alkali-deficient alpha-NaCrO2 oxide host — extends the composition genus to non-lithium alkali intercalants a competitor could substitute (§112 support: speculative)

Independent claim — Process

Concept: A low-temperature process for producing the metastable alkali-cation-deficient layered oxide by electrochemically extracting mobile A+ cations from a stoichiometric parent oxide of alpha-NaCrO2 structure, thereby creating a controlled population of cation vacancies and driving x substantially below one, to reach vacancy concentrations not attainable by conventional high-temperature solid-state synthesis. (§112 support: data-backed)

Core elements: Electrochemical extraction of A+ cations at low temperature to create A+ vacancies, Stoichiometric parent oxide LiCoO2 as starting material, Composition window x ~= 0.067 to ~1, Metastable alkali-deficient phase inaccessible by conventional high-temperature synthesis

Dependent ladder (broad → narrow):

  • the parent oxide being a lithium cobalt oxide near stoichiometric LiCoO2 (e.g., Li_0.99Co_1.01O2) — ties the route to the demonstrated starting material and the worked delithiation example (§112 support: data-backed)
  • carrying the extraction to a deep-deficiency endpoint of x on the order of 0.067 — covers the deepest demonstrated extraction and the metastable regime the high-temperature route cannot reach (§112 support: data-backed)
  • conducting extraction at sustained current densities up to roughly 4 mA/cm^2 — captures the demonstrated operating rate as a process parameter for a competitor's manufacturing line (§112 support: data-backed)
  • the parent oxide being a lithium nickel oxide near Li_0.85Ni_1.15O2 subjected to the same electrochemical extraction — extends the route to the second named cathode family (§112 support: described, no data)
  • extracting sodium or potassium from a corresponding stoichiometric alpha-NaCrO2 parent oxide — blocks substitution of a different alkali parent while using the same low-temperature electrochemical route (§112 support: speculative)

Independent claim — Structure

Concept: An intercalation electrode in which the electrochemically active material is the alkali-deficient layered transition-metal oxide host (A_xM_yO2 of alpha-NaCrO2 structure, x substantially below one) serving as a reversible host for mobile A+ cations, characterized by an oxide/redox-metal framework rather than a chalcogenide framework. (§112 support: data-backed)

Core elements: Alkali-deficient layered oxide phase (x substantially less than 1) as intercalation electrode, Transition metal M (e.g., Co or Ni) as the redox-active framework cation, Alkali cation A = Li, Na, or K as the mobile intercalant, Chemical diffusion coefficient of mobile cation ~5e-9 cm^2/s, Sustained current density up to ~4 mA/cm^2

Dependent ladder (broad → narrow):

  • the active material being the lithium-cobalt-oxide alkali-deficient host — narrows to the demonstrated electrode material (§112 support: data-backed)
  • the host exhibiting a chemical diffusion coefficient for the mobile cation on the order of 5e-9 cm^2/s — captures the transport performance figure characterizing the demonstrated electrode (§112 support: data-backed)
  • the electrode sustaining current densities up to roughly 4 mA/cm^2 during reversible cycling — captures a rate-capability parameter distinguishing a commercial cell electrode (§112 support: data-backed)
  • the active material being the lithium-nickel-oxide alkali-deficient host — covers the second named electrode embodiment (§112 support: described, no data)
  • a complete cell pairing the alkali-deficient layered oxide positive electrode with a counter electrode supplying the mobile alkali cation — covers the assembled energy-storage cell as the commercial product form (§112 support: described, no data)

Independent claim — Method-of-use

Concept: A method of storing and releasing electrical energy by reversibly inserting and extracting mobile A+ cations into and out of the alkali-deficient alpha-NaCrO2 layered oxide host while cycling within a deep cation-deficient window (roughly x = 0.2 to 0.8) such that the layered framework is maintained across repeated cycles. Note: for counsel to assess whether operating within the deep-extraction window on this oxide host carries independent weight, or is better pursued dependent on the composition/structure sets. (§112 support: described, no data)

Core elements: Reversible A+ intercalation/deintercalation as charge-storage mechanism, Preferred operating composition window x ~= 0.2 to 0.8 for cycle life with structural stability, Layered oxide host framework preserved across deep-delithiation composition range

Dependent ladder (broad → narrow):

  • cycling a lithium-cobalt-oxide host within the deep-deficient window — ties the method to the demonstrated chemistry (§112 support: data-backed)
  • operating with the mobile cation being lithium and the framework retained across the ~0.2 to 0.8 window over repeated cycles — captures the cycle-life/stability embodiment relevant to a commercial battery (§112 support: described, no data)
  • operating at a delivered cell voltage substantially higher than a comparable chalcogenide (TiS2) intercalation electrode — covers the higher-energy operating benefit as a downstream consequence of the oxide chemistry (voltage figure treated as consequence, not the anchoring limitation) (§112 support: data-backed)

Blocking claims (for obvious design-arounds)

  • Workaround: Substituting sodium or potassium for lithium as the mobile alkali intercalant in the same alpha-NaCrO2 layered oxide host to avoid a lithium-specific claim Block with: A composition/structure genus reciting the mobile intercalant as any alkali cation selected from lithium, sodium, or potassium in the alkali-deficient alpha-NaCrO2 oxide host (§112 support: speculative)

  • Workaround: Replacing cobalt with nickel (or another first-row redox-active transition metal) to escape a cobalt-only recitation Block with: A genus reciting M as a redox-active transition metal that includes both cobalt and nickel in the layered oxide framework (§112 support: described, no data)

  • Workaround: Reaching a somewhat different vacancy concentration (e.g., operating at x just outside a narrow recited band) while still exploiting the metastable deficient regime Block with: A composition genus defined by the full deep-extraction window (x from roughly 0.067 up toward one) with the layered framework retained, rather than a single narrow x value (§112 support: data-backed)

  • Workaround: Producing a cation-deficient layered oxide by some non-thermal chemical (rather than electrochemical) extraction to sidestep a purely electrochemical process claim Block with: A process genus covering low-temperature extraction of A+ from a stoichiometric parent that yields the metastable vacancy-bearing phase unattainable by high-temperature synthesis, framed to reach chemical as well as electrochemical low-temperature de-alkaliation routes the disclosure supports (§112 support: speculative)

  • Workaround: Using the same oxide host but characterizing the product only as the assembled cell to avoid the bare-material composition claim Block with: A structure/system claim to an energy-storage cell whose active positive-electrode material is the alkali-deficient alpha-NaCrO2 layered oxide host (§112 support: described, no data)

Notes: Only the lithium-cobalt-oxide embodiment (parent near Li_0.99Co_1.01O2 delithiated to x ~0.067, with the ~5e-9 cm^2/s diffusion coefficient and ~4 mA/cm^2 rate) is data_backed; all downstream rungs resting on it inherit that support. The lithium-nickel-oxide phase (Li_0.85Ni_1.15O2) and the preferred x ~0.2-0.8 operating window are described_not_demonstrated — before filing, counsel may want structural/electrochemical data confirming framework retention and cycle life across that window and confirming the nickel-oxide host actually cycles as an alkali-deficient intercalation electrode. The sodium and potassium extensions are speculative (no example, no data) and should be tagged as such; broad alkali-genus claims may face §112 written-description/enablement scrutiny — for counsel to assess. On the process set, counsel flagged that retrieved delithiation papers may describe the same electrochemical route: confirm date/priority before relying on the low-temperature-extraction distinction. The method_of_use set is the weakest standalone (reversible intercalation cycling is itself known from the chalcogenide art); recommend carrying it primarily as dependent on the composition/structure sets unless the deep-window operation on this oxide host is shown to require non-obvious adaptation. Anchor the structure distinction on the layered transition-metal-oxide/redox-metal host itself, treating the 'roughly twice the TiS2 OCV' figure only as a downstream consequence rather than the load-bearing limitation. No data was invented to upgrade any tag; all supports reflect the disclosure as provided.

5.

Prior-Art Differentiation Notes

Per-Application Prior-Art Notes

Note

This is engineering work-product, not a legal opinion or a clearance/validity search. It names the legal standards; the patentability conclusions are the attorney’s.

How to read this section (the §103 framework, stated once): under Graham/KSR, obviousness turns on the scope and content of the prior art, the differences from the claims, the level of ordinary skill, and objective indicia — and any reason to combine references must be articulated, never hindsight. The per-application notes below POSITION each use against that framework; the deeper, claim-level inventive-step analysis is treated separately, at the level of the mechanism’s claims.

Each application is triaged as either "spec support only" (a predictable same-mechanism use — valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim) or "claim candidate" (required non-obvious adaptation — may merit a claim of its own).

Rechargeable batteries (portable electronics, electric vehicles) — High-voltage layered transition-metal oxide positive electrode for secondary lithium cells, operated over the deep-extraction composition window.

Closest existing work: The Li_aTiS2 chalcogenide intercalation electrode (D1) is the closest functional analog — a layered host that reversibly intercalates Li+ to store charge. The alpha-NaCrO2 prototype structure (D2) is the known crystallographic template, and conventional high-temperature oxide synthesis (D3) is the known route said to be unable to produce the alkali-deficient phases. The retrieved LixCoO2 delithiation papers all appear to postdate this filing and are unlikely to be §102 art (dates for counsel to confirm).

Differentiation: Against D1 (abstract-level, inventor-cited): the named novel element is an OXIDE host in the alpha-NaCrO2 layered structure (A_xM_yO2, LiCoO2 delithiated to metastable Li_x CoO2) rather than a sulfide chalcogenide, yielding open-circuit voltage roughly double that of Li_aTiS2; against D3 (abstract-level): the alkali-deficient metastable phase is created by low-temperature electrochemical extraction of A+, not by high-temperature synthesis. No provided reference discloses the electrochemically-generated cation-deficient layered oxide operated over the deep-extraction window (x ~0.067–1) — §102 novelty and §103 for counsel to assess.

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • D1 — Baseline chalcogenide (Li_aTiS2) intercalation electrode — same reversible cation insertion mechanism but sulfide host with ~half the voltage; the primary comparator distinguishing the oxide host (provenance: grounded)
  • D2 — Known alpha-NaCrO2 rhombohedral prototype structure adopted by the inventive phases; structure itself is prior art, so novelty rests on the electrochemically-created alkali-deficient composition, not the structure type (provenance: grounded)
  • D3 — Conventional high-temperature oxide synthesis identified as unable to reach the metastable cation-deficient phases — supports the low-temperature electrochemical-extraction distinction (provenance: grounded)
  • CN107273559B (verify) — Modeling method that lists LiCoO2/LiNiO2/LiTiS2 as candidate cathode materials with Li fraction ranges; overlaps in materials named but is a design/simulation method, not the metastable delithiated phase — verify publication date and scope (provenance: verify_full_doc)

Standard: §102 novelty (for counsel to assess); §103 obviousness (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, the closest art is the inventor-cited triad: a working intercalation electrode in a chalcogenide host (D1, Li_aTiS2), the known alpha-NaCrO2 layered prototype structure (D2), and the acknowledgment that conventional high-temperature synthesis cannot produce the alkali-deficient metastable phases (D3). The inquiry is whether substituting an oxide host (LiCoO2/LiNiO2) into the known intercalation paradigm and then electrochemically deep-extracting Li+ to x≈0.067 to create a metastable cation-deficient layered phase would have been a predictable variation over D1 read with D2, or whether D3 and the deep-extraction structural behavior point the other way. The retrieved patents (US10556510B2 state-of-charge, EP2841956B1 monitoring chip, JP7806117B2 gradient electrode, CN107273559B modeling, JP7777617B2 Si-anode) and the delithiation-mechanism papers all post-date this foundational work and/or address unrelated subject matter, so they bear little on the combination and should be treated as background rather than combinable prior art.

Articulated reason (KSR): A PHOSITA aware of reversible Li+ intercalation in TiS2 (D1) and of the alpha-NaCrO2 layered structural family (D2) had an articulated motivation — seek higher cell voltage/energy density — to substitute a more ionic/electronegative oxide framework for the chalcogenide host, since the oxygen-vs-sulfur ligand shift raising redox potential is a general electrochemical principle; but that reasoning does not by itself supply the novel step of electrochemically extracting A+ to reach a metastable, deeply cation-deficient phase, which D3 expressly identifies as unattainable by the conventional synthesis route.

Reasonable expectation of success: A PHOSITA might have expected an oxide host to give higher voltage, but would not have had a reasonable expectation that the layered framework would survive extraction down to x≈0.067 while remaining reversibly cyclable, nor that a diffusion coefficient ~5e-9 cm^2/s and sustained ~4 mA/cm^2 were achievable — D3's teaching that these vacancy-rich phases resist conventional synthesis signals structural instability, making the deep-extraction result uncertain rather than predictable.

Secondary considerations (each needs a nexus):

  • Unexpected results (open-circuit voltage roughly twice that of Li_aTiS2) — nexus: Directly tied to the claimed oxide host operated over the deep-extraction window and measured against the D1 comparator; nexus is strong, though counsel should note the O-vs-S voltage increase is partly predictable in direction, so the unexpectedness lies in its magnitude and in retention of reversibility, not in the mere fact of a higher voltage.
  • Teaching away / inaccessibility by conventional means (D3) — nexus: Nexus to the named 'metastable alkali-deficient phase inaccessible by high-temperature synthesis' and the electrochemical-extraction route; D3 corroborates that the phase cannot be made conventionally, supporting that the low-temperature electrochemical creation of A+ vacancies is not a routine substitution. This rests on a provided reference, not a bare assertion.
  • Long-felt need (higher energy-density secondary-cell cathode) — nexus: Nexus to the high-voltage oxide cathode claim, but as presented it is asserted rather than documented; a reference evidencing the industry's demand for higher-voltage cathodes would strengthen it — otherwise it rests on an uncorroborated norm and carries limited weight.
  • Unexpected deep-delithiation structural stability (host preserved to x≈0.067; preferred x≈0.2–0.8) — nexus: Nexus to the 'layered oxide host framework preserved across deep-delithiation range' element; note this is demonstrated only for the LiCoO2 embodiment, while the LiNiO2, Na, and K variants are described/speculative, so the nexus is strongest for the data-backed Co example.

Standard: §103 obviousness (for counsel to assess)

Grid-scale and stationary energy storage — Layered oxide cathode operated with sodium or potassium as the mobile intercalant for lower-cost, abundance-driven stationary cells.

Closest existing work: No retrieved reference addresses sodium- or potassium-based layered oxide cathodes made by low-temperature electrochemical alkali extraction. The nearest handles are the inventor-cited alpha-NaCrO2 structural prototype (D2) — itself a sodium transition-metal layered oxide, relevant to the A=Na framework — and CN107273559B, which enumerates lithium layered oxide cathodes (LiCoO2, LiNiO2, LiCrO2) but only for lithium and only as a computational design method, not as an electrochemically-produced Na/K-deficient metastable phase.

Differentiation: This comparison is abstract-level for D2 (structure prototype only) and claim-level for CN107273559B: neither discloses the named novel element of electrochemically extracting Na+ or K+ at low temperature to create a metastable alkali-deficient A_xM_yO2 (x<<1) layered host in the composition window x~0.067–1 — CN107273559B claims a lithium-only modeling method, and D2 discloses only the parent crystal structure, not the vacancy-governed capacity/voltage or deep-deintercalation range. §102 novelty and §103 obviousness for counsel to assess.

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • D2 (alpha-NaCrO2 structure) — The sodium chromium oxide prototype structure the inventive Na/K phases adopt; structural, not the electrochemical extraction or alkali-deficient metastable phase (provenance: grounded)
  • CN107273559B (verify) — Enumerates layered oxide cathodes (LiCoO2, LiNiO2, LiCrO2) but only lithium-based and only as a design/modeling method — no Na/K electrochemical vacancy creation (provenance: grounded)
  • D1 (Li_a TiS2 comparator) — Baseline chalcogenide intercalation electrode against which the layered oxide's ~2x voltage is measured; not a Na/K layered oxide (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, the question for this application is whether substituting Na or K for Li as the mobile intercalant in the alpha-NaCrO2-structured A_x M_y O2 host is a predictable variation of the data-backed Li embodiment; notably, the disclosure names Na/K only as speculative embodiments and the prototype structure itself (D2, alpha-NaCrO2) is already a sodium-containing layered oxide, which cuts toward predictability of the cation swap.

Articulated reason (KSR): A PHOSITA would have a concrete, non-hindsight motivation to try Na/K in the same layered framework — lithium scarcity and cost for stationary/grid storage is a recognized design incentive, and D2's alpha-NaCrO2 prototype directly signals that a sodium cation is accommodated in this exact rhombohedral structure — making the substitution one of a finite set of identified alkali candidates (Li, Na, K) rather than open-ended experimentation.

Reasonable expectation of success: Expectation is partial: the layered-oxide intercalation mechanism and the D2 sodium prototype support success for Na, but the invention's core named element — a metastable alkali-DEFICIENT phase created by low-temperature electrochemical extraction and inaccessible by high-temperature synthesis (D3) — was demonstrated only for Li (down to x~0.067), and the larger ionic radii of Na/K raise real uncertainty about diffusion (~5e-9 cm^2/s), sustained current density (~4 mA/cm^2), and whether the deep-vacancy layered framework is preserved for these cations.

Secondary considerations (each needs a nexus):

  • Long-felt need / commercial need (abundant, cheap alkali for grid storage) — nexus: The abundance value proposition attaches to the choice of Na/K generally, not to the invention's named novel element (the electrochemically-created metastable cation-deficient phase); nexus to the specific claimed feature is weak because cheap-alkali demand exists independent of the vacancy-governed capacity mechanism.
  • Unexpected results (open-circuit voltage roughly twice comparable Li_a TiS2) — nexus: No nexus for this application — the ~2x OCV result was measured for the Li/LiCoO2 embodiment versus D1, and the disclosure provides no Na/K data showing an analogous unexpected voltage or capacity advantage.
  • Teaching-away / inaccessibility by conventional synthesis (D3) — nexus: Nexus rests on the asserted point that high-temperature synthesis cannot reach these metastable Na/K-deficient phases; this is asserted, not demonstrated for Na/K, so it is uncorroborated for this application — a reference showing sodium-deficient Na_xMO2 already made electrochemically or otherwise would defeat it.

Standard: §103 obviousness (for counsel to assess)

Materials synthesis / solid-state chemistry (method asset) — Low-temperature electrochemical extraction (and re-insertion) as a general topotactic route to metastable cation-deficient phases that thermal synthesis cannot produce, applied to host families beyond the lead oxide.

Closest existing work: The inventor-cited baseline of conventional high-temperature layered-oxide synthesis (D3), which cannot access the alkali-deficient metastable phases, plus modern retrieved papers on electrochemical delithiation of LiCoO2 that observe the vacancy-rich delithiated phases as a characterization/mechanism subject rather than as a deliberate synthesis route.

Differentiation: Abstract-level (papers give no claim text): the named novel element here is repurposing low-temperature electrochemical A+ extraction as a general topotactic SYNTHESIS platform to make and stabilize metastable cation-deficient phases (A_x M_y O2, x<<1, alpha-NaCrO2 framework preserved) that thermal synthesis cannot produce and to extend it to host families beyond the lead oxide — the retrieved delithiation papers show the mechanism/phase but not its use as a composition-targeting synthesis method decoupled from thermal-stability limits, and D3 is expressly the thermal route that fails to reach these phases (§102 novelty for counsel to assess).

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • D3 — Inventor-cited high-temperature synthesis route; identified as unable to produce the metastable alkali-deficient phases the electrochemical method targets — the direct contrast for the synthesis-platform framing. (provenance: grounded)
  • Electrochemically Driven Phase Transition in LiCoO2 Cathode (2021) — Documents electrochemically induced delithiated/vacancy-rich phases in LiCoO2 — overlaps the mechanism but treats it as a phase-transition observation, not a general synthesis route to metastable phases. (provenance: grounded)
  • Atomic-scale insight into the lattice volume plunge of LixCoO2 upon deep delithiation (2022) — Deep-delithiation LixCoO2 study covering the low-x composition regime central to the invention's window; abstract-level only. (provenance: verify_full_doc)
  • Structure and electron density analysis of electrochemically and chemically delithiated LiCoO2 single crystals — Compares electrochemical vs chemical delithiation of LiCoO2 — relevant to the low-temperature electrochemical extraction element; pull full text to confirm scope. (provenance: verify_full_doc)

Standard: §102 novelty (for counsel to assess)

Condensed entry: triaged spec-support-only, so the full §103 positioning is reserved for claim-candidate applications and the origin field.

Thermoelectric energy conversion / waste-heat harvesting — Alkali-deficient layered transition-metal oxide as a high-temperature thermoelectric (Seebeck) material whose carrier concentration is tuned by controlling alkali/vacancy content.

Closest existing work: The provided prior art is entirely battery/delithiation-focused — the closest are the LixCoO2 delithiation studies (e.g., the 2019 paper on structural-distortion-induced Co2+/Co3+/Co4+ charge-gradient distribution and the deep-delithiation lattice-volume papers), which document that electrochemically created Li-vacancy content changes the oxide's electronic/charge-compensation state. None of the provided references address thermoelectric (Seebeck) energy conversion.

Differentiation: Abstract-level (no thermoelectric claim text in the provided art): the delithiation references disclose the invention's core relationship — electrochemically created alkali vacancies in the alpha-NaCrO2-structured LixCoO2 host govern electronic state — but none disclose repurposing that vacancy-tuned carrier concentration to convert a temperature gradient into voltage, nor using low-temperature electrochemical extraction to set carrier density/thermopower more finely than thermal doping. The named novel elements (metastable alkali-deficient phase, electrochemical vacancy creation, layered A_xM_yO2 host) map onto the battery art, but the thermoelectric function and its finer vacancy-control mechanism are absent from the provided set.

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • Structural Distortion-Induced Charge Gradient Distribution of Co Ions in Delithiated LiCoO2 (2019) — Documents that electrochemical delithiation vacancies alter Co oxidation-state/electronic structure — the same vacancy-governs-electronic-properties knob repurposed here for thermopower, but in a battery context only (provenance: grounded)
  • Atomic-scale insight into the lattice volume plunge of LixCoO2 upon deep delithiation (2022) — Deep-delithiation vacancy/structure relationship in the same layered host across the composition window; battery-focused, silent on thermoelectric conversion (provenance: grounded)
  • D2 (alpha-NaCrO2 structure) — Prototype layered structure shared by the thermoelectric embodiment; abstract-level structural comparator only (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, the question is whether a PHOSITA would repurpose the disclosure's central material relationship (A+ vacancy concentration governs the electronic properties of the alpha-NaCrO2 layered oxide) from charge storage to thermoelectric energy conversion, where the same vacancy knob sets carrier density and thermopower. None of the provided references (D1–D3 or the retrieved delithiation-mechanism papers and battery-management patents) address Seebeck behavior, high-temperature thermoelectric operation, or ZT of layered cobaltates, so the record here supplies the material and the vacancy-control mechanism but no thermoelectric target or teaching.

Articulated reason (KSR): A reason to combine could be articulated from the shared physical principle — vacancy content controls carrier concentration in layered M-O2 oxides — which is exactly the parameter that governs both cell voltage (disclosure) and thermopower; but on the provided art alone, no reference bridges the electrochemical framework to a thermoelectric use, so asserting the combination risks hindsight absent a thermoelectric-cobaltate reference the attorney would need to locate.

Reasonable expectation of success: A PHOSITA would face substantial uncertainty: the provided references demonstrate reversible Li+ intercalation, diffusion, and structural behavior at battery temperatures, but say nothing about high-temperature phase stability, Seebeck coefficient, or whether an electrochemically-created metastable vacancy population survives at the elevated temperatures thermoelectric harvesting requires — so success in the thermoelectric domain is not predictable from this record.

Secondary considerations (each needs a nexus):

  • Unexpected results (finer vacancy tuning than thermal doping) — nexus: Ties directly to the named 'electrochemical extraction at low temperature' and 'metastable phase inaccessible by high-temperature synthesis' elements, and to the thermoelectric carrier-tuning goal; however, no data in the provided record shows superior thermopower or ZT from electrochemically-set vacancies, so the nexus rests on an uncorroborated asserted advantage — a reference showing comparable thermal-doping control would defeat it.
  • Teaching away — nexus: No provided reference teaches for or against thermoelectric use of these phases; D3's statement that high-temperature synthesis cannot access the metastable phase cuts toward the electrochemical route's uniqueness but does not establish a thermoelectric teaching-away — no nexus established on this record.
  • Long-felt need / commercial success — nexus: No nexus established; the provided art contains no evidence of demand for or adoption of vacancy-tuned layered-oxide thermoelectrics.

Standard: §103 obviousness (for counsel to assess)

Electrocatalysis / green hydrogen and fuel production — Deeply extracted (alkali-deficient) layered cobalt/nickel oxide surfaces as oxygen-evolution-reaction catalysts for water electrolysis.

Closest existing work: The retrieved and cited prior art all concerns the same alkali-deficient layered oxide as an energy-storage electrode — e.g., the deep-delithiation LiCoO2 studies (collective CoO6 glide, Co2+/Co3+/Co4+ charge-gradient surface, lattice-volume plunge) which describe electrochemically-created high-valent cobalt surface sites, but strictly in a battery cathode context. No provided reference addresses the oxygen-evolution-reaction / water-electrolysis catalysis application.

Differentiation: At the abstract level (no OER claim text was provided): the delithiation papers disclose the named novel element itself — an electrochemically-created, high-temperature-inaccessible alkali-deficient layered A_xM_yO2 phase with high-valent surface metal centers — but none disclose repurposing that electron-deficient surface as a regenerable OER electrocatalyst; the catalytic function, and the use of the same electrochemical vacancy route to generate/regenerate the active surface, is absent from all provided art. §102 novelty and §103 obviousness are for counsel to assess.

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • Paper: Structural Distortion-Induced Charge Gradient Distribution of Co Ions in Delithiated LiCoO2 (2019) — Describes the Co2+/Co3+/Co4+ high-valent surface-to-bulk gradient created by delithiation — the exact electron-deficient surface the invention would exploit for OER, but framed only as a battery phenomenon, not catalysis. (provenance: grounded)
  • Paper: Sustainable LiCoO2 by collective glide of CoO6 slabs upon charge/discharge (2022) — Documents electrochemical deep-delithiation producing the metastable alkali-deficient layered phase; closest to the named vacancy-creation element but silent on catalytic use. (provenance: grounded)
  • CN107273559B (verify) — Lists LiCoO2/LiNiO2 layered cathode compositions but is directed to battery electrode design/modeling, not OER catalysis. (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, this application repurposes the same electrochemically-created alkali-deficient, high-valent-metal surface (the invention's core named feature) as an oxygen-evolution catalyst rather than a charge-storage electrode; the question is whether a PHOSITA would have been led from the battery-cathode disclosures to a water-electrolysis catalyst. None of the provided references (D1–D3 or the retrieved delithiation/state-of-charge patents and papers) address electrocatalysis or OER at all, so any reason to make this leap is absent from the present record and would risk hindsight sourced from the inventor's own vacancy-creation insight.

Articulated reason (KSR): The disclosure's own rationale — that alkali extraction raises the transition-metal oxidation state and yields electron-deficient sites 'associated with' OER — is an articulated mechanistic reason, but it is drawn from general catalysis knowledge, not from any provided reference; the delithiation papers characterize Co2+/Co3+/Co4+ charge gradients and structural change for battery purposes only and never suggest a catalytic use, so the record supplies no art-based motivation to redeploy the material for water splitting.

Reasonable expectation of success: A PHOSITA would have limited expectation of success: the demonstrated performance (voltage, diffusion coefficient, ~4 mA/cm^2) is in a nonaqueous intercalation cell, whereas OER demands stability and activity under anodic potentials in aqueous electrolyte, where deeply delithiated LiCoO2 is documented (in the provided papers) to undergo structural damage, slab glide, and lattice volume collapse — factors that cut against a predictable, durable catalytic surface.

Secondary considerations (each needs a nexus):

  • New utility / far-field use of the substance — nexus: Nexus to the named alkali-deficient high-valent surface is plausible in principle (same feature said to create active sites), but no OER activity data is provided, so the nexus is asserted rather than demonstrated.
  • Teaching-away / distinct operating environment — nexus: Rests on the general premise that high-valent oxide surfaces drive OER — an uncorroborated asserted norm not shown by any provided reference; a reference showing delithiated cobalt/nickel oxides are already known OER catalysts would defeat any non-obviousness argument here, and such art is well-known in the field though not in this record.
  • Regenerability of the active surface via the electrochemical route — nexus: Ties to the named low-temperature electrochemical extraction/regeneration feature, but no evidence of catalytic regeneration is provided, so it carries no weight on the present record.

Standard: §103 obviousness (for counsel to assess)

Solid oxide fuel cells / gas separation — Layered transition-metal oxide as a mixed ionic-electronic conductor for a fuel-cell air electrode or an oxygen-transport membrane.

Closest existing work: None of the provided references address a fuel-cell air electrode or oxygen-transport membrane; the closest material references (inventor-cited D2 alpha-NaCrO2 structure; retrieved delithiated-LixCoO2 papers) all treat the layered oxide purely as a battery intercalation cathode, not as a mixed ionic-electronic conductor for gas conversion/separation.

Differentiation: The named novel elements — an electrochemically-formed metastable alkali-deficient A_xM_yO2 phase in which A+ (Li/Na/K) vacancy concentration governs cell voltage/capacity — are directed to reversible cation storage, whereas this application redeploys the same host as a mixed conductor whose functional transport species for a fuel-cell/membrane is oxygen; no provided reference discloses either that MIEC/oxygen-transport use or the electrochemical low-temperature vacancy-creation step in that context (abstract-level comparison, as none of the references reach this domain — for counsel's §102/§103 assessment).

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • D2 (alpha-NaCrO2 crystal structure) — Discloses the prototype rhombohedral layered structure the inventive phases adopt, but only as a structural prototype, with no fuel-cell/membrane or mixed-conductor application. (provenance: grounded)
  • CN107273559B (verify) — Enumerates LiCoO2/LiNiO2 layered cathodes and transport parameters (Li diffusivity/conductivity) in a battery-design context only; no oxygen-transport-membrane or SOFC air-electrode use. (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Condensed entry: triaged spec-support-only, so the full §103 positioning is reserved for claim-candidate applications and the origin field.

6.

Candidate Filings & Family Structure

Filing Strategy

File one comprehensive 'jumbo' provisional bundling the core subject matter — the alpha-NaCrO2-type layered transition-metal oxide operated over the deep cation-extraction window, plus the electrochemical extraction/re-insertion method and the vacancy-concentration-governs-properties relationship. This anchors priority around the data-backed LiCoO2 embodiment while capturing the described and speculative extensions (Li/Na/K cathodes, synthesis platform, and far-field material re-uses) in a single detailed specification. Within the 12-month provisional window (non-extendable — verify with counsel), convert the shared detailed description into a US non-provisional and a PCT, each carrying DIFFERENTIATED CLAIM SETS: composition-of-matter and high-voltage cathode claims lead (application 1), with method/process claims (application 3) and the alkali-variant and far-field claims layered per how the supporting data matures. The single shared description drives down the per-conversion attorney fee rather than paying full independent drafting cost for each jurisdiction/claim set.

Recommended Filings

  • provisional — Jumbo provisional: layered alpha-NaCrO2-structure transition-metal oxide host, deep electrochemical cation extraction/re-insertion, preferred x~0.2-0.8 operating window, data-backed LiCoO2 embodiment, LiNiO2 and Na/K variants, the electrochemical topotactic synthesis method, and recited far-field uses (thermoelectric, OER electrocatalysis, mixed-conductor SOFC/membrane).

    • Bundles all shared core subject matter under one earliest date; the data-backed cathode is the lead target and the location of the closest prior art (chalcogenide intercalation electrodes), so establishing a firm priority anchor here has the highest defensive value.

  • non_provisional — US filing off the shared description, claim set centered on the high-voltage layered oxide cathode and the deep-extraction composition window (application 1), with dependent method claims for application 3.

    • Primary offensive/defensive US asset built on the strongest evidentiary base; convert before the 12-month provisional deadline (verify with counsel).

  • pct — PCT off the same shared description (12-month priority, 30-month national phase — verify with counsel), preserving foreign options with claim sets differentiated per jurisdiction, including the Na/K abundance-driven stationary-storage variant (application 2).

    • Keeps foreign filing decisions open at low incremental cost given the shared spec; the Na/K low-cost angle targets markets where lithium scarcity is the commercial driver.

  • divisional — Reserved for restriction-driven separation if the examiner deems the composition, method, and distinct-use claims separate inventions.

    • Restriction is likely given the breadth (composition + process + multiple end-uses); a divisional preserves the earliest date for the split-out claims without new matter.

  • continuation — Reserved to pursue additional claim scope (e.g., method-platform or alkali-variant claims) that is fully supported by the shared description, once the lead case allows.

    • Inherits the original date with no new matter; useful to keep prosecuting broader or alternative claims covered by the same disclosure.

Invention Split

Verdict: uncertain. All six applications rest on the SAME substance (alkali-deficient layered transition-metal oxide) and the SAME core relationship (vacancy concentration governs electronic/transport properties), so they read as one material-centric family rather than distinct products — unlike a genuinely different product with no shared mechanism. However, applications 4-6 (thermoelectric, OER electrocatalysis, SOFC/mixed-conductor) repurpose the material into entirely different functional domains and are purely speculative with no supporting data; if pursued seriously they may each need their own provisional built around domain-specific data, and may be restricted out during examination. Recommend keeping everything in the jumbo provisional now for a common priority anchor, then re-evaluating a split for the far-field uses as data develops.

  • Separate filing candidate: Application 4 — thermoelectric/Seebeck use (candidate for its own provisional once thermopower/carrier-tuning data exists)
  • Separate filing candidate: Application 5 — OER electrocatalysis use (candidate for its own provisional once catalytic/surface data exists)
  • Separate filing candidate: Application 6 — SOFC air electrode / oxygen-transport membrane use (candidate for its own provisional once mixed-conduction/oxygen-exchange data exists)

Disclosure Gaps (per application)

  • 1 — High-voltage layered oxide Li cathode (portable/EV batteries) (data_backed): Strongest position already supported by measured OCV (~2x LiaTiS2), diffusion coefficient (~5e-9 cm^2/s), and sustained current density (~4 mA/cm^2). To strengthen breadth, add cycle-life/capacity-retention data across the deep-extraction window and confirmatory data at the x~0.067 extreme vs. the preferred x~0.2-0.8 window.

  • 2 — Na/K layered oxide cathode (grid/stationary storage) (described_not_demonstrated): Reversible Na+/K+ extraction/insertion data (voltage profile, capacity, diffusion, cycle life) for the alpha-NaCrO2-structure host; the Na/K variants are named but not demonstrated, so at least one working example per alkali would materially support a filing.

  • 3 — Electrochemical topotactic synthesis platform (method asset) (speculative): Worked examples beyond the lead oxide showing the low-temperature electrochemical route produces metastable vacancy-rich phases inaccessible by thermal synthesis, with framework-preservation characterization (e.g., structural data before/after) for at least one non-battery host family.

  • 4 — Thermoelectric waste-heat conversion (speculative): Seebeck coefficient, electrical/thermal conductivity, and ZT-type performance data as a function of vacancy/alkali content, at target high-temperature operating conditions.

  • 5 — OER electrocatalysis / green hydrogen (speculative): Electrocatalytic activity data for the alkali-deficient surface (overpotential, current density, Tafel behavior, stability/regeneration under OER conditions) tied to the high-valent-metal surface-site claim.

  • 6 — SOFC air electrode / oxygen-transport membrane (speculative): Quantified mixed ionic-electronic conductivity, oxygen surface-exchange and bulk-diffusion coefficients, and stability under fuel-cell/membrane operating atmospheres and temperatures.

7.

Grounding & Search Log

Grounding Summary

Note

Of 6 application(s) analyzed for prior art:

  • 6 grounded (claim text was available for 5 of 14 retrieved references; the comparison is abstract-level for the rest)

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