▎ 摘　　要

NOVELTY - Preparing a lithium iron phosphate/fluorine-doped graphene composite material comprises mixing iron(II) oxalate dehydrate, ammonium dihydrogen phosphate and lithium carbonate in a ball mill tank, adding carbon source, acetone, performing intermittent high-speed ball milling in a high-energy ball mill to form a flowing phase, placing the flowing phase substance into an evaporation dish, drying it naturally under a fan, removing acetone to obtain a solid phase deposit with a low acetone content, vacuum drying the solid phase deposit, cooling to obtain acetone-free solid phase precursors, grinding the solid phase precursor, passing through a 500-mesh sieve to obtain a micron-sized powder, compacting the powder obtained in the step (d) under a protective atmosphere, sintering, cooling and grinding to obtain lithium iron phosphate/fluorine-doped graphene composite material. USE - The method is useful for preparing a lithium iron phosphate/fluorine-doped graphene composite material. ADVANTAGE - The method replaces graphene modification; improves the rate performance and reduces the cost; improves the properties of the composite materials and at the same time the performance is much higher than commercial lithium iron phosphate. DETAILED DESCRIPTION - Preparing a lithium iron phosphate/fluorine-doped graphene composite material comprises (a) mixing iron(II) oxalate dehydrate, ammonium dihydrogen phosphate and lithium carbonate in a ball mill tank in a ratio of 1: 1: 1, adding carbon source, acetone, performing intermittent high-speed ball milling in a high-energy ball mill to form a flowing phase, (b) placing the flowing phase substance obtained in the step (a) into an evaporation dish, drying it naturally under a fan, removing acetone to obtain a solid phase deposit with a low acetone content, (c) vacuum drying the solid phase deposit obtained in the step (b) at 50-80 degrees C for 10-20 hours, cooling to obtain acetone-free solid phase precursors, (d) grinding the solid phase precursor obtained in the step (c), passing through a 500-mesh sieve to obtain a micron-sized powder, (e) compacting the powder obtained in the step (d) under a protective atmosphere, sintering to 350 degrees C for 1-3 hours, increasing the temperature to 600-700 degrees C for 15-25 hours at a rate of 3-10 degrees C/ minute, cooling to 2-5 degrees C / minute and grinding through a 500-mesh sieve to obtain lithium iron phosphate / fluorine-doped graphene composite material.