Ternary positive electrode material, and preparation method therefor and use thereof

During the preparation of the ternary positive electrode material, non-ammonia complexing agent is used to mix with nickel-cobalt ions and control the reaction conditions, the problems of seed agglomeration and environmental pollution are solved, and the electrochemical performance of the material is improved.

WO2025054903A1 Publication Date: 2025-03-20GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
PCT/CN2023/118816
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-14
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

The prior art is prone to seed agglomeration when preparing ternary cathode materials, and the use of ammonia as a complexing agent is not environmentally friendly, which affects the electrochemical properties of the material.

Method used

The nickel-cobalt complexing solution is prepared by mixing nickel-cobalt ions with a non-ammonia complexing agent, and then mixing it with the manganese solution after freezing, and the frozen mixed solution is refluxed with an alkaline reflux solution to melt the frozen mixed solution, and the reaction conditions are controlled to gradually grow seeds, obtaining a ternary precursor with high spherical shape and uniform distribution of nickel-cobalt-manganese elements.

Benefits of technology

It avoids seed agglomeration, reduces environmental pollution, and improves the electrochemical properties of the ternary cathode material, including the first discharge capacity and cycle retention rate.

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Abstract

Provided in the present disclosure are a ternary positive electrode material, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) mixing a nickel source, a cobalt source, a non-ammonia complexing agent and a solvent, freezing the mixture to obtain a frozen solution A, freezing a manganese salt solution to obtain a frozen solution B, crushing the frozen solution A and the frozen solution B at a low temperature, and pressing and freezing same to obtain a frozen solution C; (2) placing the frozen solution C in a reflux device, controlling the reflux flow of an alkaline reflux between the reflux device and a reaction device until the frozen solution C is completely melted to obtain a turbid liquid, and subjecting the turbid liquid to solid-liquid separation to obtain a precursor; and (3) mixing the precursor with a lithium source, and sintering the mixture to obtain a ternary positive electrode material. By means of the method of the present disclosure, grains can be slowly generated, thereby avoiding a seed crystal agglomeration phenomenon caused by excessive fast growth, and nickel, cobalt and manganese elements in the prepared precursor are uniformly distributed, thereby improving the electrochemical performance of the ternary positive electrode material.
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