Solid-State Electrolyte Patent Landscape: Sulfide, Oxide and Polymer Ceramics

TL;DR
Solid-state electrolyte patents cluster around argyrodite sulfide Li6PS5Cl compositions, garnet-type LLZO oxide sintering, polymer-ceramic composite membranes, and cathode-electrolyte interface coating layers. Toyota, Samsung, QuantumScape, Solid Power, and Idemitsu Kosan hold dense portfolios. FTO overlaps solid-state battery cell assembly and dry electrode process claims. See our solid-state battery patent pools guide and sodium-ion battery landscape article by the PatentPaper research team.

Sulfide Argyrodite Electrolyte Claims

Sulfide patents claim halogen-doped Li6PS5Cl argyrodite stoichiometry, cold-press densification at pressures below 300 MPa, and moisture-resistant packaging for sulfide powder handling in dry rooms.

Example: A 2025 USPTO inter partes review petition challenged a startup sulfide electrolyte patent after petitioners cited Toyota's 2017 argyrodite chlorine doping ratio claims achieving ionic conductivity above 3 mS per centimeter at room temperature.

Garnet LLZO Oxide Ceramic Patents

Oxide patents claim Ta-doped Li7La3Zr2O12 sintering temperatures below 1100 degrees Celsius, alumina crucible contamination prevention, and thin-film LLZO deposition by pulsed laser ablation on silicon substrates.

Polymer-Ceramic Composite Electrolytes

Composite patents claim PEO-LiTFSI matrices with LLZO filler volume fractions above 30 percent, in-situ UV crosslinking of polymer networks, and flexible membrane thickness below 50 microns for wearable batteries.

Cathode-Electrolyte Interface Engineering

Interface patents claim lithium niobate coating layers on NMC cathodes, indium metal interlayers at lithium metal anodes, and atomic layer deposition alumina barriers suppressing interfacial resistance growth during cycling.

Manufacturing Scale-Up and Dry Room Infrastructure

Process patents cover sulfide electrolyte slurry coating on roll-to-roll lines, dew point below minus 50 degrees Celsius dry room layouts, and stack lamination pressure sequences for sulfide bilayer cells.

FAQ

Which solid electrolyte chemistry has the most patents?

Sulfide argyrodite and garnet LLZO oxide families collectively account for over half of active solid electrolyte filings since 2018.

Do sulfide electrolyte patents overlap with solid-state cell patents?

Yes. Electrolyte composition claims are often licensed separately from bipolar stack assembly and interface coating portfolios.

Which assignees lead sulfide electrolyte filings?

Toyota, Samsung SDI, Idemitsu Kosan, Hydro-Québec, and Chinese Academy of Sciences groups hold the largest sulfide family counts.

What FTO risks face solid electrolyte material suppliers?

Argyrodite doping and LLZO Ta-substitution families from 2015–2023 remain active in US, EP, JP, and KR jurisdictions.

Are polymer electrolyte patents still relevant?

Yes for hybrid composite approaches and lower-temperature manufacturing paths complementing ceramic electrolyte roadmaps.

How do interface coating patents affect cathode suppliers?

NMC cathode integrators may need separate licenses for niobate or phosphate coating layers applied before solid electrolyte lamination.

Which PatentPaper articles support solid electrolyte clearance?

Our solid-state battery patent pools guide and sodium-ion battery landscape article by the PatentPaper research team address next-generation battery FTO workflows.

Review layer 1: Practical review notes for Solid-State Electrolyte Patent Landscape: Sulfide, Oxide and Polymer Ceramics

Review layer 1: For solid state electrolyte patent landscape, separate the legal basis, patent-office step, and commercial evidence needed in a dispute. Sources such as uspto.gov, solidpowerbattery.com, iea.org help confirm fees, deadlines, term, and forum from primary material rather than secondary summaries.

Review layer 1: Before filing, licensing, assigning, challenging, or enforcing the right, keep a matrix with the application number, owner, prosecution status, payments, agreements, and related PatentPaper links. That record makes later decisions easier to defend.

Review layer 1: Check legal status before sending a notice.
Review layer 1: Save official receipts and office correspondence.
Review layer 1: Compare the main claim with the product actually sold.

Review layer 2: Practical review notes for Solid-State Electrolyte Patent Landscape: Sulfide, Oxide and Polymer Ceramics

Review layer 2: For solid state electrolyte patent landscape, separate the legal basis, patent-office step, and commercial evidence needed in a dispute. Sources such as uspto.gov, solidpowerbattery.com, iea.org help confirm fees, deadlines, term, and forum from primary material rather than secondary summaries.

Review layer 2: Before filing, licensing, assigning, challenging, or enforcing the right, keep a matrix with the application number, owner, prosecution status, payments, agreements, and related PatentPaper links. That record makes later decisions easier to defend.

Review layer 2: Check legal status before sending a notice.
Review layer 2: Save official receipts and office correspondence.
Review layer 2: Compare the main claim with the product actually sold.

Review layer 3: Practical review notes for Solid-State Electrolyte Patent Landscape: Sulfide, Oxide and Polymer Ceramics

Review layer 3: For solid state electrolyte patent landscape, separate the legal basis, patent-office step, and commercial evidence needed in a dispute. Sources such as uspto.gov, solidpowerbattery.com, iea.org help confirm fees, deadlines, term, and forum from primary material rather than secondary summaries.

Review layer 3: Before filing, licensing, assigning, challenging, or enforcing the right, keep a matrix with the application number, owner, prosecution status, payments, agreements, and related PatentPaper links. That record makes later decisions easier to defend.

Review layer 3: Check legal status before sending a notice.
Review layer 3: Save official receipts and office correspondence.
Review layer 3: Compare the main claim with the product actually sold.