Core-shell iron manganese phosphate precursor, modified lithium iron manganese phosphate material, preparation method and application of modified lithium iron manganese phosphate material and lithium ion battery

By preparing a core-shell iron manganese phosphate precursor with Fe3(PO4)2 as the core and MnxFe1-x(PO4)y as the shell, and combining aluminum doping and lithium aluminate coating, the problems of component separation and interface inhomogeneity of lithium manganese iron phosphate materials were solved, and the fast charging and high current cycling stability of the materials were improved.

CN121894628APending Publication Date: 2026-04-21CENT SOUTH UNIV
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Patent Information

Application Number
CN202610112403.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-27
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

Existing lithium manganese iron phosphate materials suffer from phase separation and segregation of metal components during preparation, resulting in an undesirable interface structure that makes it difficult to meet the requirements for long-term cycle stability under fast charging and high current.

Method used

A core-shell manganese iron phosphate precursor with Fe3(PO4)2 as the core and MnxFe1-x(PO4)y as the shell was used to prepare modified lithium iron manganese phosphate materials through a two-stage gas evolution reaction and aluminum doping and lithium aluminate coating process, thus solving the problems of separation and uneven interface.

Benefits of technology

It significantly improves the fast-charging performance and high-current cycling stability of the material, reduces doping segregation and coating interface impedance, and improves the electrochemical performance of the material.

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Abstract

The invention belongs to the field of positive electrode materials, and particularly relates to a core-shell ferromanganese phosphate precursor, a modified lithium ferric manganese phosphate material, a preparation method and application of the modified lithium ferric manganese phosphate material and a lithium ion battery. The core-shell ferromanganese phosphate precursor comprises a core and a shell wrapping the core, and the core is Fe3 (PO4) 2; the shell is MnxFe1-x (PO4) y (ferromanganese phosphate), x is more than or equal to 0.1 and less than or equal to 0.9, and y is more than or equal to 0.67 and less than or equal to 0.75. The invention provides a core-shell ferromanganese phosphate precursor which takes Fe3 (PO4) 2 as a core and MnxFe1-x (PO4) y as a shell, and when the core-shell ferromanganese phosphate precursor is used for preparing lithium ferromanganese phosphate, the problem of component segregation is solved, and the Jahn-Teller effect of manganese is reduced; especially for subsequent doping and coating, doping segregation is expected to be reduced, coating interface impedance is reduced, and rapid charging of the prepared material and cycling stability under large current can be remarkably enhanced.
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