A lithium manganese iron phosphate positive electrode material, a preparation method and application thereof

Abstract

The application discloses a lithium manganese iron phosphate positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium batteries. The preparation method comprises the following steps: preparing a rare earth-polysaccharide coordination gel, obtaining a precursor powder through molecular-level assembly and spray drying, mixing the precursor powder with a lithium source to perform gradient carbonization heat treatment, and finally preparing the material through in-situ activation. The spiral polysaccharide coordination and the gradient distribution of rare earth are combined with a double-layer carbon coating structure, so that the electronic conductivity and the lattice stability of the material are remarkably improved, the manganese dissolution is effectively inhibited, the high-temperature cycle and the rate performance are improved, the process is suitable for industrialization, and the prepared material has high discharge capacity, long cycle life and excellent high-temperature stability.

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