A sodium-ion battery cathode material, preparation method and battery

CN115241446BActive Publication Date: 2026-04-03EVE ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-29
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing sodium-ion battery cathode materials suffer from poor structural stability, poor conductivity, and poor cycle performance, which limits their widespread application.

Method used

A carbon coating layer and an aluminum oxide coating layer are set on the core surface of the cathode material of a sodium-ion battery. The carbon coating layer improves the conductivity, and the aluminum oxide coating layer improves the stability of the material. The aluminum oxide coating layer is obtained by denaturation of aluminum isopropoxide gel film and uniformly covers the surface of the material.

Benefits of technology

It improves the conductivity and cycle stability of sodium-ion battery cathode materials, constructs a good electrode-electrolyte interface, and enhances the rate performance and cycle performance of the materials.

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Abstract

This invention provides a sodium-ion battery cathode material, a preparation method, and a battery. The sodium-ion battery cathode material includes a core, an alumina coating layer, and a carbon coating layer disposed between the core and the alumina coating layer. The alumina coating layer is obtained by modifying an aluminum isopropoxide gel film. The sodium-ion battery cathode material of this invention has a carbon layer and an alumina coating layer obtained by modifying an aluminum isopropoxide gel film coated on the surface of the core. The alumina is more uniformly coated on the material surface, making the material performance more stable. The sodium-ion battery cathode material has a stable structure, good conductivity, and good cycle performance.
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