▎ 摘　　要

NOVELTY - Preparing graphene-coated lithium manganese iron phosphate comprises (1) mixing precursor, lithium source and phosphorus source to obtain mixture, where the precursor is co-precipitation product of iron and manganese, and comprising doping metal ions, and (2) calcining the mixture, introducing into carbon source gas after the heat preservation stage in the calcination process ends, and continually insulating to obtain graphene coating manganese iron phosphate lithium. USE - The iron phosphate is useful in lithium ion battery (claimed). ADVANTAGE - The method: utilizes metal active sites combined with chemical vapor deposition; significantly improves the conductivity, cycle performance and rate performance of the material; reduces the internal resistance of the battery and the polarization phenomenon of charge and discharge; and has simple and easy to operate overall process, which can reduce the reaction temperature and cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: graphene-coated lithium manganese iron phosphate prepared by the above-mentioned preparation method; and lithium-ion battery, comprising graphene-coated lithium manganese iron phosphate.