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

  • Company Chapter – FDK – Japan

    Version: 2026-07-13, for paid subscribers
  • Technology Assessment: Can a co-fired oxide chip that trades absolute energy density for reflow-solderability and elevated-temperature operation reach a market large enough to sustain it? The chapter examines how a single-step co-sintering approach positions against the interface-stability and yield questions it creates, how a scarce-element cost floor shapes the electrolyte roadmap, and how public statements align with what the patent portfolio reveals about development priorities.
    Product Development Pathway
    (5 R&D Concepts)
    Substituted NASICON-type oxide electrolyte: a reformulated phosphate composition that lowers dependence on a scarce, cost-dominant constituent while holding ionic conductivity at the level of the incumbent material and staying compatible with the cathode through firing. Co-fired monolithic chip architecture: cathode, separator, anode and current collectors consolidated in one sintering step into a rigid, pressure-free surface-mount body suited to standard board assembly. Further concepts address interfacial-resistance growth at the cathode during elevated-temperature cycling, anode particle engineering for rate capability, and encapsulation integrity against cracking and moisture ingress at the package boundary.
    Potential Synergies to Deliver Well-Rounded Cells for Application
    A single co-sintering window binds electrolyte, both electrode interfaces and the protective shell into one process step – so each concept must earn its place within shared firing constraints, aligning cost, rate, high-temperature endurance and package robustness.
  • Document size: ≈3,900 words, 14 images, 1 adjacent Excel file (list of patent families with AI-based summaries)


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