▎ 摘　　要

NOVELTY - Preparing a graphene-coated lithium iron phosphate cathode material involves ultrasonically dispersing lithium iron phosphate in deionized water to form a suspension, where weight ratio of lithium iron phosphate and deionized water is 1:100-160, adding an anionic surfactant to obtained suspension for ultrasonic dispersion for 14-16 minutes, where weight ratio of anionic surfactant and lithium iron phosphate is 0.005-0.03:1, dispersing graphene oxide in deionized water to form a suspension, where weight ratio of graphene oxide and water is 1:50-100, where weight ratio of graphene oxide and lithium iron phosphate is 0.025-0.05:1. The prepared suspension is slowly added to prepared solution, and the mixture is prepared by ultrasonication for 15-20 minutes. The prepared mixture is sealed in a polytetrafluoroethylene reactor, and the polytetrafluoroethylene reactor is placed in a microwave hydrothermal reactor for 1.5-2.5 hours, and microwave hydrothermal reaction temperature is 90-120 degrees C. USE - Method for preparing graphene-coated lithium iron phosphate cathode material. ADVANTAGE - The method enables to prepare a graphene-coated lithium iron phosphate cathode material which has good conductivity, uniform coating carbon source distribution and good quality stability. DETAILED DESCRIPTION - The obtained mixture is subjected to centrifugation, and the mixture is washed repeatedly for 4-6 times, and the solid is dried under vacuum at 80 degrees C for 11-13 hours to obtain a graphene oxide-coated lithium iron phosphate. The obtained powder is heated at 350 degrees C in an argon atmosphere for pre-burning decomposition, and further calcined at a temperature of 750-900 degrees C for 17-19 hours to obtain a cathode material coated with graphene-coated lithium iron phosphate.