▎ 摘　　要

NOVELTY - A graphene/tin acid lithium iron phosphate composite material preparation method involves adding graphite oxide and lithium-tin oxide 5 into 250-400 ml of N, N-dimethyl formamide, treating ultrasonically, stirring uniformly, adding 2-4 ml of 30% hydrazine hydrate, stirring and reacting at 85-95 degrees C for 18-24 hours under water bath, cooling to room temperature, washing resultant product using trichloromethane, and drying at room temperature to obtain finished product. USE - Method for preparing graphene/tin acid-lithium-iron phosphate composite material that is utilized for manufacturing a lithium battery. ADVANTAGE - The method enables preparing graphene/tin acid-lithium-iron phosphate composite material with better charging and discharging characteristics.