▎ 摘　　要

NOVELTY - Graphene composite cathode material preparation involves taking three-dimensional chemical vapor deposition graphene as a skeleton, lithium hydroxide, lithium nitrate or lithium acetate as lithium source, ferrous sulfate, ferrous acetate or ferric nitrate as iron source, and phosphoric acid or ammonium dihydrogen phosphate as phosphoric acid source. The reaction is accomplished at 160-220 degrees C in a hydrothermal reactor for 8-16 hours, and then calcined at 400-800 degrees C for 8 hours. The hydrothermal reaction is carried out under catalysis of ethylenediamine. USE - Method for preparing graphene composite cathode material (claimed). ADVANTAGE - The method prepares the graphene composite cathode material in a simple and cost-effective manner with excellent electrochemical performance on industrial scale. DETAILED DESCRIPTION - Graphene composite cathode material preparation involves taking three-dimensional chemical vapor deposition graphene as a skeleton, lithium hydroxide, lithium nitrate or lithium acetate as lithium source, ferrous sulfate, ferrous acetate or ferric nitrate as iron source, and phosphoric acid or ammonium dihydrogen phosphate as phosphoric acid source. The reaction is accomplished at 160-220 degrees C in a hydrothermal reactor for 8-16 hours, and then calcined at 400-800 degrees C for 8 hours. The hydrothermal reaction is carried out under catalysis of ethylenediamine to obtain the graphene composite cathode material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic X-ray powder diffraction pattern of the prepared graphene composite cathode material. (Drawing includes non-English language text).