▎ 摘　　要

NOVELTY - Preparation of graphene in situ composite lithium iron manganese phosphate anode material comprises mixing lithium, manganese, iron and phosphorus at mole ratio of 1.0-1.5:0-1:0-1:1, adding lithium carbonate, manganous-manganic oxide, ferric oxide and phosphoric acid into mixed solvent, milling, adding polyethylene pyrrolidone and acetylene, and continuously grinding to obtain mixed solution; adding liquid oligomer C3 into obtained mixed solution, continuously grinding and mixing to obtain graphene compounded lithium iron manganese phosphate anode material slurry; drying obtained graphene compounded lithium iron manganese phosphate anode material slurry to obtain anode material precursor; and pre-heating anode material precursor under inert atmosphere, crushing, thinning and calcining. USE - Method for preparing graphene in situ composite lithium iron manganese phosphate anode material. ADVANTAGE - The method is safe, can obtain product with good structural stability and improved cycle life performance.