High-nickel positive electrode material, and preparation method therefor and use thereof

The core-shell structure of the high nickel positive electrode material was prepared by co-precipitation method and two-step method, and combined with the ester solution washing, the problems of high residual alkali and excessive nickel content on the surface of the high nickel positive electrode material were solved, and the high circulation performance and thermal stability of the material were achieved.

WO2025059884A1 Publication Date: 2025-03-27GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
PCT/CN2023/119875
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-20
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

During storage and use, high nickel positive electrode materials have problems such as high residual alkali on the surface and easy reaction with air and electrolyte, resulting in unstable performance; excessive nickel content also leads to structural instability and poor cycle life.

Method used

The high-nickel positive electrode material was prepared by co-precipitation method, and a carbonate shell layer containing dioxime-based compounds was prepared by a two-step method to form a core-shell structure material with a full concentration gradient structure, and washed with an ester solution to avoid the damage to the material by water.

Benefits of technology

The circulation performance and thermal stability of high-nickel positive electrode materials are improved, the side reaction with the electrolyte is reduced, and the structural stability and electrochemical properties of the material are enhanced.

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Abstract

The present disclosure relates to the technical field of positive electrode materials for lithium ion batteries and provides a high-nickel positive electrode material, and a preparation method therefor and a use thereof. The present disclosure comprises: first preparing a high-nickel core precursor by means of a co-precipitation method, and then preparing a carbonate shell layer containing a dioxime compound by means of a two-step method; obtaining a core-shell structure high-nickel positive electrode material precursor, and carrying out a chelation reaction between the dioxime compound in the carbonate shell layer and nickel ions, so that the nickel content in the carbonate shell layer is reduced, the thermal stability of the high-nickel positive electrode material is improved, and the instability problem caused by an excessively high nickel content in the high-nickel positive electrode material is solved. In addition, due to the chelation reaction between the dioxime compound and the nickel ions, a shell structure having a low nickel gradient can be formed in the carbonate shell layer, and the nickel content in the carbonate shell layer gradually decreases along the direction away from the core structure. In addition, in the present disclosure, an organic solvent is used for washing, so that the impact of water on the structure of the high-nickel positive electrode material can be avoided.
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