▎ 摘　　要

NOVELTY - Preparation of lithium iron phosphate/graphene composite material includes mixing graphene and riboflavin sodium phosphate surfactant in solvent, dispersing using bath sonication and mechanical stirring device, obtaining graphene dispersion, sequentially adding complexing agent, lithium source compound and iron salt compound in graphene dispersion at room temperature, adjusting the pH, reacting, filtering to obtain lithium iron phosphate/graphene composite material, adding lithium iron phosphate/graphene composite material and carbon source into a ball mill, and ball milling. USE - Preparation of lithium iron phosphate/graphene composite material i.e. graphene modified lithium iron phosphate/carbon composite material (claimed) used as anode material of lithium ion battery. ADVANTAGE - The method provides lithium iron phosphate/graphene composite material, which has greatly improved electrochemical performance and cycle stability. DETAILED DESCRIPTION - Preparation of lithium iron phosphate/graphene composite material comprises mixing graphene and riboflavin sodium phosphate surfactant in solvent, dispersing using bath sonication and mechanical stirring device for 3-20 hours, obtaining graphene dispersion, taking complexing agent, lithium source compound and iron salt compound according to lithium source compound, iron salt compound, and riboflavin sodium phosphate ratio in terms of lithium (Li), iron (Fe) and phosphorus (P) of 2-4:1:1, sequentially adding in graphene dispersion at room temperature of 40-60 degrees C, adjusting the pH at 6-10, raising the temperature to 80-90 degrees C, stirring for 1-5 hours in a reaction kettle, reacting at 100-200 degrees C for 2-30 hours, filtering to obtain lithium iron phosphate/graphene composite material, adding lithium iron phosphate/graphene composite material and carbon source into a ball mill at grinding medium and material ratio of 1:3-1:8; ball milling for 2-10 hours at 100-500 revolutions/minute (rpm), drying at 30-50 degrees C, adding in high temperature furnace, calcining at 500-850 degrees C under nitrogen or argon and other inert gas protection, keeping a constant temperature for 3-24 hours, and obtaining graphene modified lithium iron phosphate/carbon composite material.