▎ 摘　　要

NOVELTY - Producing composite cathode material for lithium ion battery comprises e.g. using lithium manganese iron phosphate/graphene composite material of (I) as precursor, mixing precursor with lithium source and carbon source, under inert atmosphere, sintering at 500-700 degrees C, where the preparation of precursor comprises e.g. taking graphene oxide and manganese source, iron source and phosphorus, dissolving in organic solvent, ball-milling, where the mass of graphene oxide material total mass is 1-2%, and under vacuum condition, reacting at 40-100 degrees C, washing, filtering, drying, to obtain precursor. USE - The method is useful in producing composite cathode material for lithium ion battery (claimed). ADVANTAGE - The composite material has evenly distributed granularity, increases electric conductivity and lithium ion diffusion rate, has high performance. The method has simple technique, is economical, and is suitable for large-scale industrial production. DETAILED DESCRIPTION - Producing composite cathode material for lithium ion battery, comprises using lithium manganese iron phosphate/graphene composite material of NH4MnXFe(1-X)PO4.H2O/RGO (I) as precursor, where x is 0-1, mixing precursor with lithium source and carbon source, under inert atmosphere, sintering at 500-700 degrees C, where the preparation of precursor comprises (i) taking graphene oxide and manganese source, iron source and phosphorus, dissolving in organic solvent, ball-milling, manganese source, iron source, phosphorus source mol ratio is 0.8:0.2:0.98-1.05, the mass of graphene oxide material total mass is 1-2%, and (ii) under vacuum condition, reacting at 40-100 degrees C, washing, filtering, drying, to obtain precursor.