Solid-state battery, solid-state electrolyte material, and electric device

By using specific compounds as electrolyte membranes and introducing metal layers in solid-state batteries, the compatibility issues when sulfide solid electrolytes are combined with lithium metal anodes have been resolved, improving battery capacity, cycle performance, and rate performance, and achieving higher battery stability and efficiency.

CN122314985APending Publication Date: 2026-06-30CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411996516.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In traditional solid-state batteries, when sulfide solid electrolytes are used in combination with lithium metal anodes, it is difficult to balance battery capacity, cycle performance, and rate performance. Furthermore, oxide electrolytes have low ionic conductivity and poor interfacial contact.

Method used

A compound with the general formula Li7-2x-na+yGaxLabM1yZr2-aQaO12 is set as a second solid electrolyte membrane between a lithium metal anode and a sulfide solid electrolyte. A metal layer is introduced on the anode side, and a third solid electrolyte membrane with the same or different compounds is set on the cathode side. This reduces side reactions and improves ionic conductivity and interface compatibility.

Benefits of technology

It achieves significant improvements in cycle performance and rate performance while maintaining high capacity, reduces interface impedance, minimizes the risk of lithium dendrite short circuits, and enhances battery stability.

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Abstract

The invention provides a solid-state battery, a solid-state electrolyte material and an electric device. The solid-state battery comprises a positive pole piece, a first solid-state electrolyte membrane, a second solid-state electrolyte membrane and a negative pole piece which are stacked in sequence, the negative pole piece is a lithium metal negative pole; the material of the first solid electrolyte membrane comprises sulfide solid electrolyte; the material of the second solid electrolyte membrane comprises a compound with a general formula of Li5.2 < = 7-2x-na + y < = 7.1 GaxLabM1yZr2-aQaO12, 0 < x < = 0.3, 0 < = y < = 0.5, 0 < = a < = 0.8, 0 < b < = 3, M1 comprises one or more of II main group metal elements, Q comprises one or more of I main group metal elements, III subgroup metal elements, V main group and subgroup metal elements, and VI main group and subgroup metal elements; the valence of Q is V1, n is equal to V1-4, n is greater than or equal to 2 and less than or equal to 1, and 7-2x-na + y is greater than or equal to 5.2 and less than or equal to 7.1. The solid-state battery can give consideration to relatively high battery capacity, cycle performance and rate capability.
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