Lithium cobalt oxide cathode material and lithium ion secondary battery

By doping Ni and Mn into lithium cobalt oxide cathode materials to form single-crystal particles and near-single-crystal particles, and forming a coating layer on the surface, the structural stability problem of lithium cobalt oxide under high voltage conditions is solved, and the cycle performance and rate performance of the battery are improved.

CN122455752APending Publication Date: 2026-07-24ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Filing Date
2025-12-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Lithium cobalt oxide cathode materials have poor structural stability under high voltage conditions, which leads to a decrease in the rate performance and cycle performance of the battery. Moreover, cobalt resources are scarce and expensive.

Method used

In lithium cobalt oxide cathode materials, Ni and Mn are doped to form single crystal particles and near-single crystal particles. Combined with a surface coating layer, the crystal structure and interface stability are optimized, thereby improving electronic conductivity and lithium-ion transport efficiency.

Benefits of technology

It significantly improves the structural stability of lithium cobalt oxide under high voltage and the cycle performance of the battery, increases electronic conductivity and lithium-ion diffusion rate, and enhances the energy density and charge/discharge efficiency of the battery.

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Abstract

The application relates to the technical field of batteries, in particular to a lithium cobaltate positive electrode material and a lithium ion secondary battery comprising the lithium cobaltate positive electrode material. The lithium cobaltate positive electrode material comprises lithium cobaltate particles; the lithium cobaltate particles comprise first particles, the first particles comprise an R-3m layered structure, the average particle size of the first particles is d1, and 1 mu m <= d1 <= 10 mu m; the first particles contain elements Ni and Mn; the first particles comprise single crystal particles and quasi-single crystal particles formed by agglomeration of n single crystal particles, and n is 2-10. The lithium cobaltate positive electrode material has high electronic conductivity, can keep structural stability and high specific capacity under high voltage (charge cut-off voltage >= 4.5 V), and the battery has excellent cycle performance and rate performance.
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