Method for producing a sulfide solid electrolyte, sulfide solid electrolyte, all-solid-state battery, and method for selecting raw material compounds used in the production of a sulfide solid electrolyte.

By using selected raw material compounds and a specific composition, the production of sulfide solid electrolytes suppresses nitrogen discharge, enhancing thermal stability and expanding the operating temperature range of all-solid-state batteries.

JP2026113640APending Publication Date: 2026-07-07GS YUASA CORP
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Patent Information

Application Number
JP2026062262
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2019-06-03
Filing Date
2026-04-06
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing methods for producing sulfide solid electrolytes face issues with nitrogen discharge during the production process, leading to reduced thermal stability and limited operating temperature of all-solid-state batteries, and the difference in heat treatment temperatures for high and low Li ion conducting phases is not adequately addressed.

Method used

A method involving the use of specific raw material compounds containing N, element A, and element M, selected through first-principles calculations to suppress nitrogen discharge, and a composition containing P, S, N, element A, and element M, which are reacted and heated to produce a sulfide solid electrolyte with improved thermal stability and crystalline structure.

Benefits of technology

The method effectively suppresses nitrogen discharge, enhances thermal stability, and increases the operating temperature range of all-solid-state batteries by stabilizing the high Li ion conducting phase, allowing for improved atmospheric stability and ionic conductivity.

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Abstract

The present invention provides a sulfide solid electrolyte that can suppress the discharge of nitrogen (N) into the system during the manufacturing process. [Solution] The sulfide solid electrolyte contains P, S, N, element A, element X, and element M as constituent elements and has a crystalline structure. Here, A represents at least one element selected from the group consisting of Li, Na, and K. X represents at least one element selected from the group consisting of Cl, Br, and I. M represents at least one element selected from the group consisting of Al, Ta, Si, Sc, Mg, Nb, B, Hf, C, P, Zr, and Ti.
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Citation Information

Patent Citations

  • Method of producing sulfide solid electrolyte material

    JP2015011898A

  • Sulfide solid electrolyte, lithium solid battery and method for manufacturing sulfide solid electrolyte

    JP2018041671A

  • Sulfide solid electrolyte and method for producing the same

    JP2018156735A