A method for treating the low-impedance interface of the positive electrode of a solid-state lithium battery and the structure of the positive electrode

Abstract

The invention discloses a method for treating the low-impedance interface of the positive electrode of a solid-state lithium battery and a positive electrode structure. Through the method, the two interfaces between the active material particles in the positive electrode sheet and the solid electrolyte particles and between the positive electrode sheet and the electrolyte sheet can be effectively reduced at the same time. Impedance, so that the capacity of the active positive electrode particles in the solid-state lithium battery can be effectively utilized. The double-layer structure ceramic sheet comprising a solid electrolyte layer and a positive electrode layer prepared by the method of the invention has excellent performance, and has good application prospects in the field of solid-state lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a low-impedance interface treatment method and a positive electrode structure of a solid-state lithium battery positive electrode. Background technique [0002] All-solid-state batteries use solid-state electrolytes instead of organic liquid electrolytes that are prone to safety hazards, and have the advantages of high safety, high energy density and power density, and wide operating temperature range. [0003] Due to the solid-solid contact between solid-state electrolyte particles and active cathode particles, the contact interface resistance is too large, which has been a major challenge in the performance optimization of solid-state batteries in recent years. At the same time, when the solid electrolyte particles and the active positive electrode particles 1 are sintered at high temperature to prepare a composite positive electrode sheet, interdiffusion of the ...

AI Technical Summary

Problems solved by technology

[0004] At present, the mainstream solid electrolyte sheet made by pressing and sintering is relatively thick, and when the solid electrolyte layer is combined with the positive electrode material, it is often only through simple co-pressing or low-temperature treatment after coating, and the limited contact area has also become a cause. An important reason for the large interface resistance

Even if the all-solid-state battery uses a solid-state electrolyte with an ionic conductivity comparable to that of a liquid electrolyte, and uses the same active cathode material as a liquid lithium-ion battery, it cannot achieve a power density comparable to that of a liquid lithium-ion battery system.

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