All-solid-state battery

JPWO2025127115A1Pending Publication Date: 2025-06-19
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Patent Information

Application Number
JP2025563576
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2023-12-13
Filing Date
2024-12-12
Publication Date
2025-06-19

AI Technical Summary

Technical Problem

All-solid-state batteries using sulfide-based solid electrolytes face challenges in reducing internal resistance and preventing its increase over time, particularly when a conductive porous sheet made of carbon material is used for electrical connection.

Method used

The use of a porous metal substrate made of a Ni-Cr alloy with a Ni content of 60% by mass or more and a Cr content of 0.1% by mass or more and 40% by mass or less, which acts as a conductive connection member between the electrodes and the exterior body, effectively reduces internal resistance and suppresses its increase over time.

Benefits of technology

This configuration results in an all-solid-state battery with low internal resistance and stable performance over time, enhancing the battery's reliability and efficiency.

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Abstract

The battery internal resistance is reduced and the timewise increase in same is prevented in an all-solid-state battery that uses a sulfide-based solid electrolyte and that uses a conductive porous sheet for connection between an electrode and a conductive path of the exterior body.　The all-solid-state battery according to the present invention comprises: an electrode laminate having a positive electrode, a negative electrode, and a solid electrolyte layer; and an exterior body in which the electrode laminate is enclosed therein. This all-solid-state battery is characterized in that: the exterior body has a conductive path leading from the inside to the outside and has a porous metal substrate between the positive electrode and / or the negative electrode and the conductive path of the exterior body; at least one of the positive electrode, the negative electrode, and the solid electrolyte layer contains a sulfide-based solid electrolyte; and the porous metal substrate is composed of an alloy containing Ni and Cr wherein the Ni content in this alloy is at least 60 mass% and the Cr content in this alloy is 0.1-40 mass%.
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