Positive electrode active material and preparation method thereof, positive plate and battery

By coating the outside of the lithium manganese iron phosphate material with a shell of carbon and nitrogen elements to form a core and shell composite structure, the problems of poor conductivity and Mn ion dissolution of the lithium manganese iron phosphate battery are solved, and high stability and high efficiency operation of the battery are achieved.

CN120784306APending Publication Date: 2025-10-14TIANJIN RONBAY SKYLAND TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510845410.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-10-14

AI Technical Summary

Technical Problem

The electron and ion conductivity of lithium manganese iron phosphate batteries is poor, resulting in increased resistance, and Mn ions are easily dissolved, affecting the battery capacity, first charge efficiency and capacity retention rate.

Method used

A carbon layer and a nitrogen shell are coated on the outside of the lithium manganese iron phosphate material to form a composite structure of core and shell. The core is LiMn1-x-yFexMyPO4 and the shell is carbon and nitrogen elements. By controlling the element content and structure, the lattice structure of the positive electrode active material is stabilized, Mn dissolution is reduced, and a conductive network is constructed.

Benefits of technology

The electronic and ionic conductivity of the positive electrode active material is improved, the impedance of the battery is reduced, and the battery capacity, first charge efficiency and capacity retention rate are increased.

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Abstract

The invention provides a positive active material and a preparation method thereof, a positive plate and a battery. The positive electrode active material comprises an inner core and a shell layer coating at least part of the surface of the inner core; the inner core comprises LiMn < 1-x > FexMyPO4; wherein 1-x is greater than 0; x > 0; y > 0; the M element comprises one or more of Mg, Ca, Sr, Co, Ti, Zr, Ni, Cr and Zn; the shell layer comprises a carbon element and a nitrogen element. The positive electrode active material provided by the embodiment of the invention has relatively good electron and ion conductivity, can stabilize Mn ions in the positive electrode active material, and is beneficial to reducing impedance of a battery and improving capacity, initial charging efficiency and capacity retention rate of the battery.
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