A secondary spherical positive electrode active material and a method for preparing the same

By doping Sb and S into the secondary spherical positive electrode active material, the particle size and morphology are controlled, solving the problem of low initial coulombic efficiency in the prior art. This achieves efficient lithium-ion insertion and extraction, improves battery performance, and simplifies the preparation process.

CN122455751APending Publication Date: 2026-07-24HUNAN SHANSHAN ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN SHANSHAN ENERGY TECH CO LTD
Filing Date
2025-01-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively improve the initial coulombic efficiency of secondary spherical cathode active materials, and existing methods are costly and have limited application scope, making it difficult to meet the high requirements for battery performance improvement.

Method used

By doping Sb and S into the primary particles of the secondary spherical cathode active material and combining them with compounds of specific elements, the particle size and morphology of the primary particles can be controlled. By using sintering and water washing processes under a protective atmosphere, spherical particles with an average particle size ≤0.28μm and a particle size-to-diameter ratio of less than 3.0 are prepared, thereby improving the lithium-ion insertion and extraction efficiency.

Benefits of technology

It significantly improves the initial coulombic efficiency of the material, enhances the lithium-ion insertion and extraction performance, reduces migration resistance, improves the cycling performance of the material, and simplifies the preparation process, making it suitable for industrial production.

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Abstract

The application belongs to the technical field of battery materials, and discloses a kind of secondary ball positive active material, the primary particle of the secondary ball positive active material is doped with Sb and S.By the common doping of S and Sb element, the primary particle of the secondary ball is reduced, the uniformity of the primary particle is improved, which is beneficial to reduce the migration resistance, improve the cycle performance and the first coulomb efficiency of the material.The preparation method of the secondary ball positive active material is also disclosed, the S-containing compound and the Sb-containing compound are added simultaneously in the primary mixing process, which can effectively control the size of the primary particle, and the simultaneous addition of the two elements can make the primary particle smaller and more close to the spherical particle, and the uniformity of the primary particle is also very good.The primary particle can be made smaller and the particle is more inclined to spherical morphology, which is beneficial to reduce the lithium intercalation dynamics characteristics of the material in the charging and discharging process, and thus improve the first coulomb efficiency of the material.
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