▎ 摘　　要

NOVELTY - The preparation of lithium iron phosphate/graphene sheet composite material involves (i) adding soluble polymer material to N,N-dimethylformamide solvent, heating, stirring, and dissolving to obtain polymer spinning precursor solution, (ii) electrospinning the polymer spinning precursor solution to obtain polymer nanofiber membrane, (iii) dissolving water-soluble chitosan in water to obtain chitosan solution, adding lithium source, iron source, and phosphorus source to chitosan aqueous solution, stirring, ultrasonically processing to obtain lithium iron phosphate precursor slurry. USE - Preparation of lithium iron phosphate/graphene sheet composite material (claimed). ADVANTAGE - The method enables the preparation of lithium iron phosphate/graphene sheet composite material by simple process with uniform thickness, and excellent electrochemical property. DETAILED DESCRIPTION - The preparation method of lithium iron phosphate/graphene sheet composite material involves (i) adding soluble polymer material to N,N-dimethylformamide solvent, heating, stirring, and dissolving to obtain polymer spinning precursor solution, (ii) electrospinning the polymer spinning precursor solution to obtain polymer nanofiber membrane, (iii) dissolving certain amount of water-soluble chitosan in water to obtain chitosan solution, adding lithium source, iron source, and phosphorus source to chitosan aqueous solution, stirring, ultrasonically processing to obtain lithium iron phosphate precursor slurry, (iv) uniformly dispersing graphene oxide in lithium iron phosphate precursor slurry to obtain graphene oxide-lithium iron phosphate precursor slurry, placing the slurry in a syringe, coating a polymer nanofiber membrane on a receiving plate of an electrospinning device, electrospinning the graphene oxide-lithium iron phosphate precursor slurry on the polymer nanofiber membrane to obtain graphene oxide-lithium iron phosphate precursor polymer composite film, (v) calcining the graphene oxide-lithium iron phosphate precursor polymer composite film, and cooling.