Dry Electrode Materials 2026: Solid-State Battery — PatSnap Eureka
Dry Electrode Materials for Solid-State Battery Manufacturing
A survey of 60+ patent filings and peer-reviewed publications mapping the dominant dry electrode material chemistries, fabrication strategies, key assignees, and engineering challenges shaping solvent-free solid-state battery production through 2026.
60+ Records Across Four Jurisdictions: Mapping the Dry Electrode Frontier
The dataset encompasses more than 60 distinct patent records and academic publications spanning the US, EP, WO, and IN jurisdictions, with publication dates ranging from 2012 to 2026. The technical landscape divides into three principal clusters: dry powder/fibrillizable binder processes enabling solvent-free electrode films; composite electrode architectures that co-locate solid electrolyte and active material via mechanofusion, coating, or slurry-based methods; and interface engineering techniques including atomic layer deposition (ALD), vacuum deposition, and surface passivation designed to stabilize electrode-electrolyte contacts.
Sulfide-based solid electrolytes — particularly Li₃PS₄ glass ceramics — dominate the dry process space, while oxide electrolytes and complex hydrides serve specialized niches. The overarching driver across all clusters is the elimination of flammable liquid electrolyte and the enablement of lithium metal anodes at scale. PatSnap’s IP analytics platform provides the underlying patent intelligence powering this landscape survey.
Academic institutions including Argonne National Laboratory, the University of Maryland, and the Indian Institute of Technology Roorkee contribute notable process innovations alongside the dominant automotive and energy OEM assignees. For broader context on solid-state battery standards, the IEC and U.S. Department of Energy publish relevant technical frameworks.
Fibrillization, Calendering, and Solvent-Free Film Formation
The most commercially significant dry electrode paradigm centers on fibrillizable polymer binders mechanically shear-processed into fibrillar networks — binding active material and solid electrolyte particles into free-standing films without any solvent.
PTFE Fibrillization: Dry Electrolyte Powder at 80–97 wt%
LICAP Technologies’ portfolio describes a method in which dry electrolyte powder (comprising 80–97 wt% of the powder mixture) is combined with a fibrillizable binder, subjected to shear force to induce binder fibrillization, and pressed into a free-standing electrolyte film. A dry electrolyte powder layer is coated onto the second side of a pre-formed electrode film and pressed to form a monolithic solid electrolyte layer, eliminating solvent-drying steps entirely. Their continuation-in-part filing strategy traces back to the October 2021 parent application (Ser. No. 17/492,458).
Solvent-free · Free-standing film · Multi-jurisdiction protectionLi₃PS₄ Glass Ceramic Calendering and Fibril-Binder Laminates
Navitas Systems pursues a dry-process strategy centered on Li₃PS₄ glass ceramic electrolytes, optionally doped with air-stabilizing agents. Their method compresses an electrode dry mixture by calendering to form an electrode film, then calendars a separate electrolyte dry mixture or stand-alone electrolyte film against the electrode film surface to form a laminate. Later continuations incorporated binders comprising fibrils — forming a dry electrode film in which the binder’s fibrillar network co-distributes the electrolyte material and active material without any liquid medium.
Li₃PS₄ · Calendering · Air-stabilizing dopantSequential Complexation and Roll-to-Film Dry Manufacturing
Hyundai Motor Company introduced a dry manufacturing route for all-solid-state battery electrodes that sequences active material complexation with solid electrolyte, followed by addition of conductive material and binder, and finally rolling into a free-standing electrode film bonded to a current collector. The approach is explicitly described as solvent-free, environmentally friendly, and mechanically stable, producing free-standing membranes with enhanced ion and electron conductivity. PatSnap’s life sciences and materials solutions track such manufacturing innovations globally.
Solvent-free · Roll-to-film · Enhanced conductivityPrinted Electronics and Roll-to-Roll Processing for Rapid Scale-Up
A literature review highlighted the suitability of printed electronics and roll-to-roll processing for rapid scaling of solid-state battery fabrication. An independent Indian patent from MR. CH. SRIKANTH also describes a method and system for dry electrode manufacturing for lithium-ion batteries, emphasizing improvements in active material loading, areal capacity, and specific energy density — consistent with the global convergence on dry electrode techniques as the preferred path to higher-performance cells. The WIPO database reflects the accelerating international filing pace for these methods.
Roll-to-roll · Areal capacity · Specific energy densityElectrolyte Material Selection and Sulfide Air-Stability Performance
Sulfide electrolytes dominate the dry electrode patent space due to room-temperature processability, while interface engineering data quantifies the scale of the atmospheric instability challenge.
Electrolyte System Distribution in Dry Electrode Patents
Sulfide electrolytes (led by Li₃PS₄) dominate the dry process landscape; oxide and hydride systems serve specialised niches requiring different processing conditions.
Sulfide Electrolyte Air-Stability: Oxysulfide Nanolayer Performance
The core-shell oxysulfide nanolayer approach retains over 82.8% of initial ionic conductivity after air exposure, achieving conductivity greater than 2.50 mS/cm after 30 minutes.
Electrolyte Integration Strategies: From Porous Scaffold to Mechanofusion
Beyond solvent-free film-rolling, a large body of innovation addresses how solid electrolyte and active material are co-assembled into composite electrode layers to maximize ionic and electronic percolation while minimizing interfacial resistance.
ALD, PVD, and Surface Passivation: Taming the Electrode-Electrolyte Boundary
Interfacial resistance between electrode active material and solid electrolyte is widely recognized as a primary limiting factor for solid-state battery performance. Multiple technical strategies have been deployed to address this challenge.
Argonne ALD: Oxygen-Deficient Interfaces Enable Hundreds of High-Current Cycles
Argonne National Laboratory (UChicago Argonne, LLC) disclosed a method involving purification of solid electrolyte surfaces, vacuum deposition of interfacial layers, and deliberate formation of oxygen-deficient interfaces between deposition layers and the solid electrolyte — enabling stable electrochemical performance over hundreds of cycles at high current density, with an updated active patent in 2025.
Hyundai ALD on Conductive Additives: Suppressing Sulfide Electrolyte Decomposition
Hyundai Motor Company disclosed an ALD-based method for coating conductive material with an insulator layer prior to incorporation into a positive electrode layer containing active material and solid electrolyte — suppressing solid electrolyte decomposition driven by electronically conducting carbon. An academic study extended ALD to Cr₈O₂₁ cathode materials, showing that 12-cycle Al₂O₃ ALD coatings prevent polyethylene oxide oxidation and enhance lithium-ion transport at the electrode-electrolyte interface.
Key Assignees: Portfolio Depth and Strategic Focus
| Assignee | Records | Primary Technology Focus | Electrolyte Chemistry | Key Innovation |
|---|---|---|---|---|
| Toyota Jidosha | 10+ | Particle size optimisation, slurry rheology, fluoride-sulfide composite materials | Sulfide (Li₃PS₄), Fluoride | Solid concentration ≥72%; D50 2.5–4.5 µm active material; anti-gelling slurry (A1 ≥700, A2 ≥2000) |
| LG Energy Solution | 8+ | Porous scaffold infiltration, 3D fibrous carbon mesh, mechanofusion granules | Sulfide, Inorganic solid electrolyte | 50–70 vol% porous scaffold → 10–30 vol% final porosity; CNT/carbon fiber 3D mesh electrode |
| LICAP Technologies | 5 | Fibrillizable binder dry electrode and electrolyte films | Sulfide (dry powder) | Dry electrolyte powder 80–97 wt%; PTFE fibrillization; monolithic dry film; CIP from Oct 2021 parent |
| Navitas Systems | 4 | Li₃PS₄ glass ceramic dry calendering and fibril-binder laminates | Li₃PS₄ glass ceramic (sulfide) | Air-stabilizing dopant; fibril binder co-distribution; room-temperature dry calendering |
Bridging Lab-Scale and Industrial Production: In-Situ Synthesis and EPD
GM Global Technology Operations introduced a notably different liquid-phase in-situ synthesis approach in which electrolyte precursors — lithium sulfide (Li₂S) and phosphorus pentasulfide (P₂S₅) — are dissolved in THF solvent and chemically react during slurry formation to generate the target sulfide SSE (such as Li₃PS₄) in situ before coating on a current collector. This reactive slurry route bridges the gap between wet and dry electrode philosophies and was disclosed in 2026.
The Indian Institute of Technology Roorkee demonstrated electrophoretic deposition (EPD) of nanostructured LLZO (Li₇La₃Zr₂O₁₂) onto NMC-coated Al foil or MCMB-coated Cu foil, building solid electrolyte interlayers of 25–50 µm thickness with nanostructured ionic conductors having aspect ratios up to 20, at 40–150 V. The sequential decomposition synthesis (SDS) method enables ceramic solid electrolyte fabrication at reduced temperatures to thicknesses approaching today’s polymer separators, as reported in a 2022 literature study. The PatSnap analytics platform tracks these emerging filing trends across jurisdictions. The European Patent Office and USPTO are the primary grant authorities for these bridging technology patents.
Emerging trends across the full dataset include: growing interest in mechanofusion and granule-based dry coating as an alternative to solvent-based slurry processing; increasing patent activity from Asia-Pacific OEMs pursuing vertically integrated cell manufacturing; novel electrolyte synthesis routes (in-situ reactive slurry, EPD of LLZO, large-scale spray-dry/anneal SSE synthesis) bridging lab-scale and industrial production; and the convergence of Western dry electrode specialists (LICAP, Navitas) with automotive OEMs seeking to license or adopt solvent-free processes. Access to PatSnap’s open API enables programmatic monitoring of these trends.
Dry Electrode Materials for Solid-State Batteries — key questions answered
The most commercially significant dry electrode paradigm centers on fibrillizable polymer binders — predominantly polytetrafluoroethylene (PTFE) — that are mechanically shear-processed into fibrillar networks binding active material and solid electrolyte particles into free-standing films without any solvent. LICAP Technologies has pioneered this approach, with dry electrolyte powder comprising 80–97 wt% of the powder mixture.
Li₃PS₄ glass ceramic is the preferred sulfide electrolyte for dry processes. Its combination of high ionic conductivity and soft mechanical properties enabling room-temperature calendering makes it the material of choice across the Navitas Systems patent family.
The atmospheric instability of sulfide electrolytes is a recognized limitation. A core-shell oxysulfide nanolayer approach via environmental mechanical alloying preserves over 82.8% of initial ionic conductivity after air exposure, showing a conductivity greater than 2.50 mS/cm after air exposure for 30 minutes.
LG Energy Solution forms a preliminary electrode active material layer at controlled, high porosity (50–70 vol%) from a low-solids-concentration first slurry, then infiltrates this porous scaffold with a second liquid slurry containing solid electrolyte, producing a final electrode with low residual porosity (10–30 vol%). They also use fibrous carbon materials arranged in a three-dimensional mesh structure with inorganic solid electrolyte and active material particles impregnated uniformly throughout.
Toyota’s electrode mixture specifies a layered rock salt type electrode active material with a D50 particle size of 2.5–4.5 µm, combined with a sulfide solid electrolyte and conductive aid at a mass ratio of 2.0–11.0 wt%. Toyota has also developed composite particles comprising active material coated with a fluoride solid electrolyte combined with a sulfide electrolyte to achieve a solid concentration of 72% or more.
ALD is used to deposit conformal, nanoscale coatings on electrode active materials or conductive additives to suppress side reactions. Argonne National Laboratory’s vacuum-deposited oxygen-deficient interfaces enable stable electrochemical performance over hundreds of cycles at high current density. ALD Al₂O₃ coatings on Cr₈O₂₁ cathode materials also prevent polyethylene oxide oxidation and enhance lithium-ion transport.
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