Preparation method and application of metal-doped carbon in-situ coated lithium iron phosphate electrode material

The invention discloses a preparation method of a metal-doped carbon in-situ coated lithium iron phosphate electrode material, which comprises the following steps: ultrasonically dispersing Li3PO4 powder in deionized water, adding H3PO4 at the same time, dropwise adding a FeSO4. 7H2O aqueous solution into a suspension, carrying out reflux stirring, centrifugally collecting a product, and carrying out vacuum drying to obtain a LiFePO4 compound; the preparation method comprises the following steps: mixing a LiFePO4 compound with a metal salt and an organic ligand, adding a grinding aid solvent to carry out mechanical ball-milling reaction, growing an MOFs layer on the surface of LiFePO4 in situ, and washing and drying a composite product; organic ligands in the MOFs are sintered and carbonized under the protection of inert atmosphere, and metal ions are reduced into metal under the action of high temperature and carbon, so that the metal-doped carbon in-situ coated LiFePO4 electrode material is formed. A new th