▎ 摘　　要

NOVELTY - Preparing lithium iron phosphate/graphene composite positive electrode material, comprises: (a) weighing and adding catalyst, lithium salt, iron salt and phosphate to a dispersing agent and grinding to obtain lithium iron phosphate precursor; and (b) drying, placing the lithium iron phosphate precursor into a reactor, filling nitrogen or hydrogen, heating, then filling carbon resource gas and ammonia into the reactor, growing graphene on the surface of lithium iron phosphate precursor, stopping to fill carbon resource gas and ammonia, filling hydrogen to the reactor and cooling the product. USE - The method is useful for preparing lithium iron phosphate/graphene composite positive electrode material. ADVANTAGE - The lithium iron phosphate/graphene composite positive electrode material prepared by the method has excellent conductivity and multiplying power performance. DETAILED DESCRIPTION - Preparing lithium iron phosphate/graphene composite positive electrode material, comprises: (a) weighing catalyst (1-15%), lithium salt (5-15%), iron salt (40-60%) and phosphate (25-45%), where the catalyst comprises at least one of iron, cobalt and nickel, the lithium salt comprises at least one of lithium carbonate, lithium hydroxide, lithium nitrate and lithium phosphate, the iron salt comprises at least one of ferrous oxalate, iron sesquioxide, ferroferric oxide and iron phosphate, and the phosphate comprises at least one of ammonium dihydrogen phosphate, ammonium phosphate or diammonium hydrogen phosphate, then adding the raw materials to a dispersing agent, grinding to obtain lithium iron phosphate precursor, where the dispersing agent is distilled water or absolute ethyl alcohol; and (b) after drying, placing the lithium iron phosphate precursor prepared in the step (a) into a reactor, filling nitrogen or hydrogen to the reactor, heating at 500-1200 degrees C, stopping to fill nitrogen or hydrogen, then filling carbon resource gas and ammonia into the reactor, maintaining the temperature at 500-1200 degrees C for 20-60 minutes, growing graphene on the surface of lithium iron phosphate precursor, stopping to fill carbon resource gas and ammonia, filling hydrogen to the reactor, adjusting the temperature in the reactor to 600-800 degrees C at the speed of 10-20 degrees C/minute, maintaining the temperature at 24-48 hours, cooling the product in the reactor containing nitrogen to the normal temperature to prepare lithium iron phosphate/graphene composite positive electrode material, where the carbon resource gas is methane gas, acetylene gas or mixed gas of acetylene and argon.