▎ 摘　　要

NOVELTY - Preparing coaxial carbon/lithium iron phosphate/graphene nanofiber anode material comprises e.g. (i) taking coaxial carbon/lithium iron phosphate/graphene nanofiber anode material has a three-layer structure comprising a nano carbon fiber core layer, an intermediate layer of lithium iron phosphate coated on the outer layer of the core layer, and graphite coated outside the intermediate layer is alkene layer; (ii) taking lithium dihydrogen phosphate, ferric nitrate and polyvinylidene fluoride, adding it to acetone and volatile solvent, and stirring; (iii) mixing polyacrylonitrile powder and dimethylformamide, sealing and placing in a constant temperature water bath; (iv) adding a graphene oxide solution into dimethylformamide, mixing and stirring; and (v) adding transparent polyacrylonitrile core spinning solution, the lithium iron phosphate intermediate spinning solution and the graphene shell spinning solution into an electrospinning device for electrospinning and calcining. USE - The method is useful for preparing coaxial carbon/lithium iron phosphate/graphene nanofiber anode material. ADVANTAGE - The method: is simple; improves the electronic conductivity of the material and forms a good conductive network by contacting the fibers; increases energy density of the battery with good cycle and rate performance; and produces anode material with regular shape and a dense texture and high pressure solid density. DETAILED DESCRIPTION - Preparing coaxial carbon/lithium iron phosphate/graphene nanofiber anode material comprises (i) taking coaxial carbon/lithium iron phosphate/graphene nanofiber anode material has a three-layer structure comprising a nano carbon fiber core layer, an intermediate layer of lithium iron phosphate coated on the outer layer of the core layer, and graphite coated outside the intermediate layer is alkene layer; (ii) taking lithium dihydrogen phosphate, ferric nitrate and polyvinylidene fluoride, adding it to acetone and volatile solvent, and stirring evenly to obtain lithium iron phosphate intermediate layer spinning solution, where mass ratio of lithium dihydrogen phosphate, ferric nitrate and polyvinylidene fluoride is 0.104:0.242:0.1-0.2; (iii) mixing polyacrylonitrile powder and dimethylformamide in a mass ratio of 3-4:6-7, sealing and placing in a constant temperature water bath at 75 degrees C for 24 hours to obtain a transparent polyacrylonitrile core layer spinning silk liquid is a nano carbon fiber core spinning solution; (iv) adding a graphene oxide solution into dimethylformamide, mixing and stirring uniformly to obtain a graphene shell spinning solution; and (v) adding transparent polyacrylonitrile core spinning solution, the lithium iron phosphate intermediate spinning solution and the graphene shell spinning solution into an electrospinning device for electrospinning to obtain a nanofiber anode material precursor and calcining nanofiber anode material precursor under a nitrogen or inert gas atmosphere.