Lithium nickel manganese oxide positive electrode material, preparation method therefor and battery

By constructing a double-layer cladding of lithium phosphate and solid electrolyte on the surface of the crystals of lithium nickel manganate, the problem of unstable nickel lithium manganate positive electrode material at high voltage is solved, and the stability of the material structure and cycling performance are improved.

WO2025059929A1 Publication Date: 2025-03-27GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
PCT/CN2023/120134
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

The lithium nickel manganate positive electrode material is unstable at high voltage, resulting in Mn dissolution, structural collapse and capacity reduction, limiting its industrial development.

Method used

The lithium phosphate and solid electrolyte double-layer cladding layer are constructed on the surface of the nickel-manganate crystal. By combining the lithium phosphate cladding layer and the solid electrolyte cladding layer, the dissolution of Mn is inhibited and the structural stability of the material is improved.

Benefits of technology

It effectively inhibits the dissolution of transition metal in the positive electrode material, stabilizes the material structure, avoids capacity reduction, and improves the circulation performance and the overall performance of the battery.

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Abstract

A lithium nickel manganese oxide positive electrode material, a preparation method therefor and a battery, belonging to the technical field of batteries. With regard to the lithium nickel manganese oxide positive electrode material, constructing a lithium phosphate coating layer and a solid electrolyte coating layer on the surface of a lithium nickel manganese oxide crystal effectively inhibits dissolution of transition metal in the positive electrode material, helping to reduce contact between the surface of the material and an electrolyte, thus reducing the corrosion effect of the electrolyte on the surface of the material, and allowing the material to have more excellent cycle performance. Moreover, the provision of the lithium phosphate layer can effectively reduce the phenomenon of low capacity caused by lithium capture by the solid electrolyte from the positive electrode material, thus achieving the purposes of improving the reversible specific capacity and long cycle performance of the material.
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