Positive electrode material and preparation method thereof, positive electrode plate and all-solid-state battery

A halide modification layer on the positive electrode active material in all-solid-state batteries addresses compatibility issues with sulfide electrolytes, improving electrochemical performance by eliminating inactive lithium and reducing interface impedance.

CN119181787APending Publication Date: 2024-12-24ZHEJIANG INTELLIGENT TRANSPORTATION TECHNOLOGY INNOVATION CENTER +1
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Patent Information

Application Number
CN202411332882.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-24
Publication Date
2024-12-24

AI Technical Summary

Technical Problem

The interface compatibility between sulfide electrolytes and positive electrode active materials in all-solid-state batteries is poor, leading to side reactions and increased inactive lithium on the surface, which decreases electrochemical performance.

Method used

A halide modification layer is formed on the surface of the positive electrode active material, comprising lithium, oxygen, and a coordination metal such as niobium, tantalum, zirconium, aluminum, or manganese, with a halogen like chlorine, enhancing lithium ion conductivity and preventing direct contact with the electrolyte to reduce interface impedance.

Benefits of technology

The halide modification layer improves electrochemical performance by eliminating inactive lithium, reducing interface impedance, and enhancing lithium ion transmission, resulting in better compatibility and stability of the battery.

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Abstract

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and an all-solid-state battery. The positive electrode material at least comprises a positive electrode active material; the halide modification layer is arranged on the surface of the positive electrode active material, and the material of the halide modification layer has diffraction peaks respectively at positions with diffraction angle 2 theta values of 14 degrees + / -0.5 degrees, 24.5 degrees + / -0.5 degrees and 31 degrees + / -0.5 degrees in an X-ray diffraction pattern. According to the positive electrode material and the preparation method thereof, the positive electrode plate and the all-solid-state battery provided by the invention, non-active lithium on the surface of the positive electrode active material can be eliminated, ion conduction on the surface of the positive electrode material can be improved, direct contact between the positive electrode active material and an electrolyte can be avoided, and compatibility between the positive electrode active material and the electrolyte is improved; the electrochemical performance of the battery is improved.
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