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2026-08-25
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Li-Ion Battery Technology
Patent Highlights

Solvent-soluble organic dye light absorbers for photonic sintering of LLZTO solid electrolyte sheets, metal carbide dispersions suppressing crystalline lithium-silicon alloy formation in silicon-carbon anodes, and AlI3-densified Li2S composite positive electrodes for sulfide all-solid-state cells

Conference Poster

Where Technology Risk-Takers Diverge: Five Open Decisions on the Road to Solid-State & Solid-Liquid Electrolyte Battery Launches

Anode Posture · Operating Pressure · Processing Route · Stack Architecture · Market Entry – Based on an AI-Supported Patent Analysis

Solid-State Battery Summit · Chicago, IL, USA · August 2026

Download Poster (PDF) Post-Conference Blog Post

Prospective High Impact Advancements

⚡
Electrolytes
All-Solid & Solid-Liquid
SK On
Solvent-soluble organic dye (Disperse Red 19, λmax ≈700 nm, 1 mass%) replacing insoluble inorganic pigment as light absorber in photonically sintered LLZTO green sheets (27 μm)
σ: 6.05 × 10−4 S/cm @25°C
Samsung Electronics
Carbon black / polyvinyl alcohol-grafted polyacrylic acid interlayer (7 μm) covering 41% of an acid-etched garnet (LLZTO) surface, with ionic liquid electrolyte wetting the interlayer-free edge
Charge-transfer resistance: 130 Ω, CCD 2.0 mA/cm2
Contemporary Amperex Technology (CATL)
Bromine- and fluorine-substituted lithium metal halide (Li2.4Y0.4Zr0.6Cl4.5Br1.4F0.1, 15 mass%) ball-milled into argyrodite Li6PS5Cl facing the positive electrode
Retention: 94.98% @100 cycles
−
Anode
Negative Electrode
BTR New Material Group
Titanium carbide (TiC, 7.5 mass%, 20 nm) dispersed through a spray-granulated nano-silicon / two-stage CVD carbon composite, holding crystalline lithium-silicon alloy suppression at P = 12%
FCE: 91.2%
Shin-Etsu Chemical
Monosilane decomposition at 370°C via gas-phase silylene onto a highly carbonized porous carbon (BET 1,845 m2/g), forming low-valence nano-silicon oxide (0-valent Si grain size 0.8 nm) bonded at pore active sites
Retention: 82% @1,000 cycles
Ningbo Shanshan Silicon Based Materials
Mg2Si sacrificial template demagnesiated in two mild ethanol–organic acid stages, leaving a porous silicon core inside a SWCNT-laced mesoporous carbon cage sealed by a dense CVD carbon shell
Retention: 85.4% @500 cycles
+
Cathode
Positive Electrode
Samsung SDI
Li2S-LiI-AlI3 composite ball-milled with carbon nanofibers and argyrodite Li6PS5Cl, pressed to a 45 μm positive electrode at 32% porosity and 3 mAh/cm2
Init. capacity: 389 mAh/g
POSCO Future M
Dual carbon source of sucrose and citric acid (80 : 20 by mass, 1.5–1.65 mass% carbon) limiting LMFP particle fracture during electrode pressing at 4 ton/cm2
Retention: 99.35% @50 cycles, 45°C cycling
BASF Shanshan Battery Materials
Single-stage co-sintering of nano Co3O4 with nano Al2O3, cobalt grain-boundary diffusion carrying the coating into interior boundaries of polycrystalline high-Ni NMC (Ni0.92)
Retention: 94.6% @100 cycles
Benchmarking Experiments in Patents ⓘ
These benchmarks are drawn directly from experiments reported in the patents, where an inventive example incorporating the claimed innovation is compared against a comparative example that omits it while keeping the cell configuration, chemistry, and test conditions otherwise equivalent.
Ionic Conductivity of Light-Sintered LLZTO Sheets with Dissolved Dye Absorber (SK On)
6.05 × 10−4 S/cm
1.68 × 10−4 S/cm
Solvent-soluble organic dye (Disperse Red 19, λmax ≈700 nm, 1 mass% of the oxide particles) vs. Fe2O3 inorganic pigment at equal loading • ionic conductivity at 25°C, 27 μm LLZTO sheet after 80 J/cm2 cumulative pulsed-light sintering
Cycle Retention with Titanium Carbide Dispersion in Silicon-Carbon Anode (BTR New Material Group)
83.5%
60.9%
TiC at 7.5 mass% giving a lithium-silicon alloy suppression parameter P = 12% vs. graphite substituted for TiC at the same mass ratio (P = 3%) • capacity retention after 50 cycles, 0.25 C cycling, blended with graphite to a 480 mAh/g mixture capacity
Cycle Life to 80% State of Health with AlI3-Containing Li2S Electrode (Samsung SDI)
140 cycles
17 cycles
AlI3 in the Li2S-LiI-carbon nanofiber composite, giving a 45 μm electrode at 32% porosity vs. the same 80 : 20 electrode without AlI3 (68 μm, 42% porosity) • cycles to 80% state of health, all-solid-state cells with silver-carbon negative electrode layer, 1.4–2.65 V, 45°C
Charge-Transfer Resistance with Partial Carbon Interlayer and Wetted Edge (Samsung Electronics)
130 Ω
587 Ω
2.0 M LiFSI ionic liquid electrolyte wetting the interlayer-free edge, with a 7 μm carbon interlayer over 41% of the garnet surface vs. no liquid electrolyte at the interlayer-free edge • charge-transfer resistance at 25°C, Li metal / LLZTO / LiCoO2 cells (lower is better)

Recently Published Company Chapters
(Solid-state / Semi-solid Li-ion Battery Innovation & Patent Review)

🏢
China
Ganfeng Lithium
Technology Assessment: Can a lithium-alloy anode, rather than the pure lithium metal the field favors, carry a hybrid architecture to the highest energy densities? The chapter examines how that choice positions against stack-pressure and interface constraints, how an injected electrolyte component weighs a substantial performance opportunity against scale-up flexibility, and how public statements align with what the patent portfolio reveals about development priorities across two parallel tracks.
Product Development Pathway
(5 R&D Concepts)
Aqueous spray-dried spherical garnet for scalable oxide-electrolyte manufacturing, yielding free-flowing single-phase particles across dopant chemistries without the hard agglomeration of conventional drying routes. Rapidly synthesized oxyhalide electrolyte formed through a short, lower-temperature route addressing the halide trade-off between oxidative stability and ionic conductivity. Further concepts address membrane-level reconciliation of thermal stability with ambient ionic conductivity, surface protection of alloy foils against dendrite growth and ambient degradation, and a multilayer separator architecture whose layers are formed in a single process step, intended to restore electrical isolation after mechanical puncture.
Key Synergies
A multilayer separator architecture acts as the hub the other electrolyte concepts feed into, while the protected alloy foil supplies the anode – a vertically integrated material-to-cell pathway aligning ionic conductivity, safety and processing for full-cell qualification.
Read Full Chapter →
🏢
USA
GM
Technology Assessment: Can a sulfide architecture that runs at near-ambient stack pressure reach production without the compression hardware such cells would otherwise demand? The chapter examines how a halide-free electrolyte approach underpins that route, how a pattern of component and process subtraction runs through the cell designs, why process-window control remains the central scale-up question, and how public statements align with what the patent portfolio reveals about development priorities.
Product Development Pathway
(6 R&D Concepts)
Halide-free sulfide solid electrolyte built on a modified crystalline phase that departs from the conventional thiophosphate, positioned to serve as both catholyte and separator within a single chemistry. Porous membrane of that same electrolyte infiltrated with a small amount of solvate liquid with favorable safety characteristics, keeping ionic pathways continuous across contacts so cells operate at a fraction of the stack pressure dry sulfide architectures require. Further concepts address interfacial protection at nickel-rich cathode surfaces, anode volume-change accommodation without binders or additives, first-cycle lithium inventory replacement, and current-collector simplification in stacked bipolar designs.
Key Synergies
One electrolyte chemistry potentially serving as catholyte, separator and the base for the low-pressure variant, while each remaining concept removes a component or a process step – aligning energy density, pressure management and cost toward a launchable cell.
Read Full Chapter →
🏢
Taiwan
Foxconn (Hon Hai Precision Industry) / SolidEdge Solution
Technology Assessment: Can the world's largest electronics manufacturing group convert its in-house materials capability into a working anode-free cell? The chapter examines how the oxide electrolyte route serves the plated-lithium interface rather than the reverse, why dendrite-free plating under fast charge remains the decisive scale-up question, and how public cell demonstrations align with what the patent portfolio reveals about development priorities.
Product Development Pathway
(4 R&D Concepts)
Two-stage atmosphere-staged sintering that separates precursor stabilization from cubic-phase conversion, targeting phase-pure garnet powder at industrial batch scale. In-situ conversion of the garnet particle surface into a covalently bonded coating, countering both interfacial passivation and binder incompatibility during electrode fabrication in a single processing step. Further concepts address continuous roll-to-roll membrane casting of oxide/polymer composites, where slurry stability and film uniformity govern line throughput, and an anode-free architecture in which the electrolyte formulation, rather than an engineered interlayer on the collector, is tasked with directing uniform lithium plating.
Key Synergies
A vertically integrated powder-to-cell pathway in which each processing step conditions the next – phase-pure oxide feeding a binder-stable casting line and a plated-lithium interface – aligning material purity, membrane manufacturability and volumetric energy density.
Read Full Chapter →
🏢
Japan
Idemitsu Kosan
Technology Assessment: Idemitsu supplies electrolyte rather than cells, along an integrated route from refinery by-product sulfur through to finished material. The chapter examines why three in-house routes are pursued to one moisture-sensitive raw material, how closely the portfolio converges with the sulfide chemistry prominent in the Toyota chapter of this review, and how public statements align with what the patent portfolio reveals about development priorities.
Product Development Pathway
(5 R&D Concepts)
Liquid-phase electrolyte synthesis using an elemental halogen feed in place of moisture-retentive halide salts, with the process solvent recovered and returned to a purity sufficient for reuse rather than disposal. Solventless dry surface modification performing particle coating and size reduction in a single high-shear pass, removing the drying stage that admits moisture and residual solvent. Further concepts address interface stabilization against oxide cathode active materials through an in-situ secondary phase, mechanical reinforcement of thin self-standing electrolyte sheets against crack formation under pressing, and plant-level equipment cleaning that manages gas-evolution hazards without contaminating the following batch.
Key Synergies
A single electrolyte chemistry feeding two grades, with each synthesis, modification and forming step consuming the output of the last – aligning ionic conductivity, interface stability and sheet handling with the plant practices needed to qualify supply at scale.
Read Full Chapter →