▎ 摘　　要

NOVELTY - Preparing a carbon-coated polyanionic ferromanganese composite material, involves performing a ball milling of ammonium dihydrogen phosphate, manganese source, iron source, lithium source, carbon source and dispersant to obtain the first slurry. The first slurry is dried and pre-sintered in sequence to obtain a primary calcined product. The secondary ball milling is performed on the primary calcined product, carbon source and dispersant to obtain the second slurry. The second slurry is dried and calcined in sequence to obtain a carbon-coated polyanionic ferromanganese composite material. USE - Method for preparing carbon-coated polyanionic ferromanganese composite material in positive electrode of lithium-ion battery (claimed). ADVANTAGE - The components of the carbon-coated polyanionic ferromanganese composite material are uniformly mixed, and the particles are not easy to agglomerate and are uniformly coated. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: A carbon-coated polyanion ferromanganese composite material prepared by the method. An application of the carbon-coated polyanion ferromanganese composite material in the positive electrode of lithium-ion battery, where carbon-coated polyanion ferromanganese composite material, conductive agent, adhesive and oil-based solvent are mixed to obtain slurry, which is coated on the surface of the pole piece made of ternary material and then dried for 10-15 hours at 80-120℃, where the thickness of the coating is 1-5 μm.