Positive electrode material, preparation method therefor and use thereof

By defining the Mn3+ content in the case of a lithium-ion battery positive electrode material, the problem of poor interface stability caused by the instability of the disordered phase nickel-manganate lithium Mn3+ is solved, and the rate performance and cycle stability of the positive electrode material are greatly improved.

WO2025061106A1 Publication Date: 2025-03-27NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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Patent Information

Application Number
PCT/CN2024/119822
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-19
Filing Date
2024-09-19
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

The existing lithium-ion battery positive electrode materials have shortcomings in improving rate performance and cycle stability, especially the Mn3+ instability of the disordered phase nickel-manganate leads to poor interface stability.

Method used

By defining the Mn3+ content in the casing of the positive electrode material, the Mn3+ content on the outermost casing is not less than 5%, so as to maximize the consideration of electronic conductivity and interface stability.

Benefits of technology

The significant improvement in the rate performance and cycle stability of the positive electrode material has been achieved. The rate performance of 2C/0.1C is not less than 90%, and the capacity retention rate after 100 cycles is not less than 84%.

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Abstract

Provided are a positive electrode material, a preparation method therefor and a use thereof. The positive electrode material comprises a core and a shell covering at least part of the surface of the core, and in the direction from the center of the positive electrode material to the surface of the positive electrode material, the content of Mn3+ in the shell is reduced in a gradient manner, and the content of Mn3+ on the outermost surface of the shell is not less than 5%. By limiting the change trend and the minimum content of Mn3+ in the shell, the electronic conductivity of the positive electrode material and the interface stability of the positive electrode material and an electrolyte are considered to the maximum extent, and using the positive electrode material in a battery is conductive to improving the rate capability and the cycling stability.
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