Positive electrode active material and preparation method thereof, lithium ion battery and electric equipment

By designing the structure of the outer coating layer of the core in the positive electrode active material of lithium-ion batteries and controlling the standard deviation of the characteristic peak intensity and the lattice matching, the problem of side reactions of layered lithium transition metal oxides at high voltage is solved, and good high-temperature cycling and storage performance are achieved.

CN120674475APending Publication Date: 2025-09-19NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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Patent Information

Application Number
CN202510895826.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-30
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

The side reactions at the surface interface of layered lithium transition metal oxides under high voltage lead to the deterioration of the high-temperature cycling performance and high-temperature storage performance of lithium-ion batteries. The existing coating layers are difficult to meet the market's growing performance requirements.

Method used

A positive electrode active material design is adopted in which the core is a first layered lithium transition metal oxide and the outer coating is a second layered lithium transition metal oxide. By controlling the standard deviation of the characteristic peak intensity of the Raman spectrum and the relationship between the characteristic peak intensity of the XPS spectrum, the uniformity and lattice matching of the coating layer are improved, and side reactions and structural instability are reduced.

Benefits of technology

The structural stability of the positive electrode active material is improved, the DC resistance growth rate of the lithium-ion battery during the cycle is reduced, and the high-temperature cycle performance and high-temperature storage performance are improved.

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Abstract

The invention provides a positive electrode active material and a preparation method thereof, a lithium ion battery and electric equipment, and belongs to the technical field of positive electrode active material manufacturing. The positive electrode active material comprises an inner core and a coating layer, the inner core comprises a first layered lithium transition metal oxide, the coating layer coats at least part of the surface of the inner core, and the coating layer comprises a second layered lithium transition metal oxide; in the Raman spectrum of the positive electrode active material, the positive electrode active material meets the following requirements (1) to (3): (1) S1 is less than or equal to 0.2; (II) S2 < = 0.2; and (III) S3 < = 0.2. According to the positive electrode active material, the lithium ion battery can have good high-temperature cycle performance and high-temperature storage performance, so that the increasing requirements of the market on the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery are met.
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Citation Information

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