▎ 摘　　要

NOVELTY - A nano-size LiVPO4F/graphene composite anode material preparing method involves dispersing oxidized graphene in deionized water in an ultrasonic dispersion to form stable dispersion, adding vanadium source and citric acid or oxalic acid to a dispersion to form solution, and adding phosphoric acid, lithium and fluorine source with solution to form stable hydrosol solution and dried to obtain solid product. The solid product is decomposed in air pre-calciner to obtain precursor followed by heating, washing and drying the precursor to obtain LiVPO4F/graphene composite anode material. USE - Method for preparing LiVPO4F/graphene composite anode material that is utilized in a lithium ion battery. ADVANTAGE - The method enables preparing the anode material with high electric conductivity and better electrochemical property. DETAILED DESCRIPTION - A nano-size LiVPO4F/graphene composite anode material preparing method involves dispersing oxidized graphene in deionized water under ultrasonic dispersion to form stable dispersion, adding vanadium source and citric acid or oxalic acid to a dispersion to form solution at 20-90 V for 10-180 minutes, and adding phosphoric acid source, lithium source and fluorine source with solution to form stable hydrosol solution at 70-140 degrees C. The stable hydrosol solution is dried to obtain solid product. The solid product is subjected to mechanical mixing for 20-360 minutes. The solid product is decomposed in air pre-calciner at 250-400 degrees C for 2-10 hours to obtain precursor followed by heating precursor at 450-800 degrees C for 10 hours under inert gas atmosphere to obtain LiVPO4F/graphene composite anode material, subjecting the LiVPO4F/graphene composite anode material to ultrasonic dispersion with 30-70% nitric acid aqueous solution, washing and drying after 30-90 minutes to obtain nano-size LiVPO4F/graphene composite anode material.