▎ 摘　　要

NOVELTY - A lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon positive electrode material has a particle size of 100-200 nm. The graphene/carbon is evenly coated on the surface of the positive electrode material. The particles of positive electrode material are stacked on each other to form a uniform porous structure having a pore size of 50-250 nm. The mass fraction of graphene/carbon is 7-15%. The content of graphene in graphene/carbon is 1-70%. USE - Lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon positive electrode material. ADVANTAGE - The lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon positive electrode material can be prepared in a simple, rapid and economical manner with high yield. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of lithium manganese phosphate-lithium vanadium phosphate/graphene/carbon positive electrode material, which involves: (1) adding the graphene oxide turbid liquid into an aqueous solution of an organic solvent, and carrying out ultrasonic dispersion to obtain graphene oxide dispersion liquid; (2) adding oxalic acid to the graphene oxide dispersion liquid obtained in step (1), stirring and dissolving, then adding a vanadium source, stirring and reacting to obtain vanadyl oxalate/graphene mixed solution; (3) adding a manganese source, a phosphorus source, a lithium source and an organic carbon source to the vanadyl oxalate/graphene mixed solution obtained in step (2), stirring and reacting, and freeze-drying to obtain a black precursor powder; and (4) sintering the black precursor powder obtained in step (3) under the protection of atmosphere, and cooling to room temperature along with the furnace to obtain product.