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All-Solid / Solid-Liquid Electrolyte Li-Ion Battery Innovation & Patent Review

  • Company Chapter – BYD – China

    Version: 2025-11-18, minor update: 2026-05-14, for paid subscribers
  • Technology Assessment: Can the industry's most vertically integrated EV manufacturer convert that position into a sulfide supply chain it controls end to end – and can particle-level surface chemistry keep moisture reactivity from becoming a constraint across production, service and recycling? The chapter examines how surface modification is used to address solvent compatibility and gas release, how mechanical tuning of the electrolyte shapes stack fabrication, and how public positioning compares with what the patent portfolio reveals about anode choice and electrolyte breadth.
    Product Development Pathway
    (10 R&D Concepts)
    Multi-element doped sulfide bulk modification – co-substitution across halide and framework sites tuning elastic modulus alongside ionic transport, so the particle can be densified and handled without its mechanical behavior being dictated by the conductivity optimum. Core-shell pseudohalogen surface modification – reactive surface sites partially exchanged for solvent-compatible functional groups, forming a shell that addresses moisture-driven gas release and slurry processability at the same boundary. Further concepts address a bilayer phosphide-sulfide interface directed at a metallic anode, composite membrane reinforcement through structural fillers with a matched dispersant system, plasma-modified binders for electrode formation, and a parallel polymer track spanning ionic liquid designs, intrinsic redox safety mechanisms and mixed ionic-electronic conductors.
    Potential Synergies to Deliver Well-Rounded Cells for Application
    Bulk mechanical tuning, an anchored protective shell and a matched binder system meeting at one particle boundary and one processing window – aligning modulus, surface stability and slurry rheology so handling tolerance, degradation resistance and electrode formation advance together.
  • Document size: ≈5,200 words, 7 figures, 1 adjacent Excel file (list of patent families with AI-based summaries)


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