Composite cathode material, preparation method thereof, solid-state cathode sheet, and full-solid-state battery

By preparing composite cathode materials, the problems of poor interface stability and kinetic limitations in all-solid-state batteries were solved, resulting in improved energy density and cycle stability, simplified electrode structure, and reduced internal impedance.

CN122355348APending Publication Date: 2026-07-10CHERY AUTOMOBILE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHERY AUTOMOBILE CO LTD
Filing Date
2026-03-02
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

All-solid-state batteries suffer from poor electrical and cycle performance due to the poor interfacial stability of their electrode structures and significant kinetic limitations.

Method used

A composite cathode material preparation method is adopted, in which sulfur-molybdenum compound is formed by mixing sulfur source and molybdenum source and heat treatment, combined with cyclooctasulfide and lithium electrolyte dispersion, and then titanium source and sulfur powder are reacted in gaseous form to deposit TiS2 layer, forming a highly efficient electrochemical active network integrating ion transport and electronic conductivity.

Benefits of technology

It significantly improves the energy density of all-solid-state batteries, simplifies the electrode structure, reduces internal impedance, extends battery cycle life, and improves electrochemical stability.

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Abstract

This application provides a composite cathode material, its preparation method, a solid-state cathode sheet, and an all-solid-state battery. The preparation method includes: sequentially mixing a sulfur source and a molybdenum source and subjecting them to a first heat treatment to obtain a sulfur-molybdenum compound; dispersing the sulfur-molybdenum compound, cyclooctasulfide, and a lithium-containing electrolyte to obtain an intermediate product; and subjecting excess titanium source, excess sulfur powder, and the first product to a second heat treatment, so that the titanium source and sulfur powder react and deposit in a gaseous state on the surface of the intermediate product to obtain the composite cathode material. This application employs a phase structure design of an all-electrochemical active material and, by optimizing the electronic and ionic conductivity of the cathode material and controlling the uniformity and stability of its microstructure, achieves a significant improvement in the energy density and cycle stability of the all-solid-state battery.
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