Solid-state / Semi-solid Li-Ion Battery Innovation & Patent Review

• Company Chapter – Blue Current – USA

  Version: 2026-04-14, minor update: 2026-05-14, for paid subscribers
• Technology Assessment: Blue Current positions as a fully dry sulfide composite developer targeting conventional Li-ion manufacturing equipment – with silicon-dominant anodes and pilot production already underway. The chapter examines how the argyrodite-polymer separator approach addresses competitive energy density, why thin electrolyte film formation remains a central scale-up question, and how public statements align with what the patent portfolio reveals about development priorities.
  Product Development Pathway
  (4 R&D Concepts)

  In-situ sintering of argyrodite-polymer composite separators using ball-milled sulfide particles that fuse during hot-pressing within elastic hydrophobic polymer matrices, eliminating a separate calcination step and enabling thin-film formation on conventional Li-ion manufacturing equipment. Functionalized polymer binders for sulfide composite electrolytes engineered to maintain ionic conductivity at high inorganic loading while accommodating silicon anode volume expansion through elastomeric polymer chemistry with tunable functional group content. Further concepts address sulfide stability under ambient moisture exposure and manufacturing architecture for consistent multilayer cell integration with embrittlement-mitigating current collector interfaces.
  Potential Synergies to Deliver Well-Rounded Cells for Application

  Material synthesis, binder engineering, and cell assembly concepts converging on a single fully dry architecture using conventional Li-ion equipment – aligning ionic conductivity, silicon volume accommodation, and sulfide safety mitigation for product launch viability.
• Document size: ≈3,200 words, 8 images, 1 adjacent Excel file (list of patent families with AI-based summaries)

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