▎ 摘　　要

NOVELTY - The method comprises mixing lithium source, iron source, manganese source, phosphorus source, organic carbon source, boron source with water, grinding to obtain a mixed slurry with particle size D50 of 0.2-0.6 μm, adding graphene oxide, drying, calcining and crushing under the nitrogen or inert gas atmosphere to obtain composite materials with carbon content of 1-6%. USE - Method for preparing boron-doped reduced graphene oxide coated lithium manganese iron phosphate composite material, which is used in the field of synthesis and application of lithium-ion battery cathode materials. ADVANTAGE - The method can increase the edge defects of reduced graphene oxide, and on the other hand, and can also make full use of the characteristics of reduced graphene oxide e.g. large specific surface area, strong electrical conductivity, and good flexibility. The lithium manganese iron phosphate particles are aggregated to form a two-dimensional conductive network to enhance the conductivity of the composite material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a boron-doped reduced graphene oxide coated lithium manganese iron phosphate composite material.