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

  • Company Chapter – Idemitsu Kosan – Japan

    Version: 2026-08-04, for paid subscribers
  • 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.
  • Document size: ≈4,000 words, 6 images, 1 adjacent Excel file (list of patent families with AI-based summaries)


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