A composite material of alloy-coated cathode material particles for solid-state batteries and a method of making the same

By forming an alloy coating layer on the surface of solid-state battery cathode material particles, the problem of insufficient contact between particles is solved, improving the battery's cycle stability and charge/discharge performance, and reducing costs.

CN122417795APending Publication Date: 2026-07-17GUANGZHOU MEIQI NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU MEIQI NEW ENERGY CO LTD
Filing Date
2026-06-04
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Insufficient close contact between cathode material particles in solid-state batteries leads to high interfacial impedance, affecting metal ion migration. Furthermore, particle volume changes during charging and discharging cause unstable contact, reducing battery performance.

Method used

A high-coverage alloy coating layer is formed on the surface of positive electrode active material particles by using plasma surface activation combined with low-melting-point alloy melt coating method, constructing a core-shell structure, improving interfacial contact and enhancing electron/ion transport performance between particles.

Benefits of technology

It improves the cycle stability and rate performance of solid-state batteries, reduces battery material costs, and enhances battery charge and discharge performance.

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Abstract

The application provides an alloy-coated positive electrode composite material for a solid-state battery and a preparation method thereof, and relates to the technical field of solid-state battery positive electrode materials, and comprises one or a combination of indium, tin, bismuth, antimony and aluminum, and raw materials are weighed according to a certain mass percentage ratio. The alloy-coated positive electrode composite material for a solid-state battery and the preparation method thereof realize high-coverage alloy coating on the surface of positive electrode active material particles by performing plasma surface activation treatment on the positive electrode active material particles, and melting, dispersing and coating a low-melting-point alloy on the surface of the positive electrode active material particles in an inert atmosphere, so that a core-shell structure with the positive electrode active material particles as the core and the alloy coating layer as the shell is formed. The method can improve the binding stability between the alloy coating layer and the positive electrode active material particles, improve the particle surface interface state, and make the obtained composite material more suitable for the positive electrode system of a solid-state battery.
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