▎ 摘　　要

NOVELTY - An iron-graphene vanadate is formed by adding hydrogen peroxide to graphene mixture and stirring to form mixture (b), adding ferrous sulfate solution to mixture (b), adding aqueous solution of sodium orthovanadate, and stir-reacting to form mixture (c), adding hydrogen peroxide to mixture (c), stirring-reacting to form mixture (d), and ethanol is added, stirred and reacted. After completion of reaction, the mixture is cooled, filtered, centrifugal-washed, and solid is collected, dried and heat-treated, to obtain iron-graphene vanadate cathode composite material. USE - Preparation of iron-graphene vanadate cathode composite material (claimed). ADVANTAGE - The method economically provides iron-graphene vanadate cathode composite material with low discharge voltage and high discharge capacity. DETAILED DESCRIPTION - A graphene sheet layers are dispersed by placing graphene suspension with mass fraction of 1-5% in stirring vessel, adding polyvinylpyrrolidone to graphene suspension, and stirring to dissolve to form mixture (a). The mass fraction of polyvinyl pyrrolidone in mixed liquid is 0.1-0.3%. The iron-graphene vanadate is formed by adding hydrogen peroxide to mixture, stirring to form mixture (b), adding 0.05-0.5 mol/L ferrous sulfate solution to mixture (b), stirring, adding 0.05-0.5 mol/L aqueous solution of sodium orthovanadate, and stir-reacting for 0.5-1.5 hours to form mixture (c), adding hydrogen peroxide to mixture (c), adjusting pH value to 4-8 and stirring-reacting for 0.5-4 hours to form mixture (d). The mixture (d) is transferred to polytetrafluoroethylene-lined reactor, and 1-2 mL ethanol is added and stirred such that the mixture is uniformly dispersed in graphene suspension, sealed and reacted at 180-220 degrees C for 10-20 hours. After completion of reaction, the mixture is cooled to room temperature, filtered, centrifugal-washed, and solid is collected, dried and heat-treated, to obtain iron-graphene vanadate cathode composite material.