A coated modified lithium manganate cathode material and a preparation method thereof, and a lithium battery

The performance bottleneck of lithium manganese oxide materials was improved by using a composite coating structure of FePO4, LiFePO4 and carbon layers. This solved the problems of manganese dissolution and interfacial impedance in the electrochemical cycling process, and improved the electrochemical performance and structural stability of the materials.

CN122068019BActive Publication Date: 2026-07-07SICHUAN CHANGHONG NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN CHANGHONG NEW ENERGY TECHNOLOGY CO LTD
Filing Date
2026-04-03
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Spinel-type lithium manganese oxide materials suffer from manganese dissolution, Jahn-Teller effect, and electrolyte decomposition during electrochemical cycling, resulting in rapid capacity decay and poor high-temperature performance. Existing coating materials have high interfacial impedance, which hinders the transport of lithium ions and electrons and cannot meet the application requirements of high-power lithium-ion batteries.

Method used

A composite structure of FePO4, LiFePO4, and carbon layers is used to coat lithium manganese oxide material from the inside out. Through the functional division and performance complementarity of each layer, a comprehensive synergistic effect is formed. The inner FePO4 layer isolates corrosive substances, the middle LFP layer buffers volume expansion stress, and the outer carbon layer constructs a continuous conductive network, thereby improving the specific capacity, rate performance, and cycle life of lithium manganese oxide.

Benefits of technology

It significantly improves the specific capacity, rate performance, cycle life and high temperature stability of lithium manganese oxide cathode materials, forms a dense CEI film to suppress side reactions, maintains the stability of the valence state of active components, and achieves a synergistic effect among the three.

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Abstract

The application discloses a coated modified lithium manganate positive electrode material and a preparation method and lithium battery thereof, and belongs to the technical field of positive electrode materials. The coated modified lithium manganate positive electrode material comprises: an inner core, the inner core is LiMn2O4, a first coating layer, the first coating layer is coated on at least part of the surface of the inner core, and the coating material is FePO4; a second coating layer, the second coating layer is coated on at least part of the surface of the first coating layer, and the coating material is LiFePO4; and a third coating layer, the third coating layer is coated on at least part of the surface of the second coating layer, and the coating material is carbon. The application takes lithium manganate (LMO) as the inner core, and sequentially coats a composite structure of iron phosphate (FePO4), lithium iron phosphate (LFP) and a carbon layer from inside to outside, so that the three are used to construct a system of "inner layer adaptive foundation building-middle layer active buffering-outer layer conductive stability", and the specific capacity, rate performance, cycle life and high-temperature stability of the lithium manganate positive electrode material are significantly improved.
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