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

  • Company Chapter – Saft – France

    Version: 2026-11-05, for paid subscribers
  • Technology Assessment: Saft carries a sulfide and a polymer electrolyte track to cells on one solvent-free forming process. The chapter examines how that shared dry route positions against the cost and solvent sensitivity of conventional slurry coating, how each track may map onto distinct duty profiles in its core markets, why film uniformity across both feedstocks remains the central scale-up question, and how public statements align with what the patent portfolio reveals about development priorities.
    Product Development Pathway
    (5 R&D Concepts)
    Solvent-free film-forming platform that produces electrode and electrolyte layers without ink solvents or drying steps, positioned as the common process hub for both electrolyte tracks and potentially as the main lever on production cost and film quality. Particle-engineered sulfide separator layer in which layer architecture rather than electrolyte chemistry is the operative design parameter, aimed at more continuous ionic transport through the full cell stack. Further concepts address interface stability and safety at the electrode level across both tracks, extending the shared process toward complete cell designs that can be matched to different application requirements on the same equipment.
    Potential Synergies to Deliver Well-Rounded Cells for Application
    One dry forming process potentially carrying both electrolyte tracks, with electrode- and layer-level concepts building on the same film body – enabling parallel de-risking of power, energy density and safety across distinct applications on shared equipment.
  • Document size: ≈4,600 words, 10 images, 1 adjacent Excel file (list of patent families with AI-based summaries)


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