▎ 摘　　要

NOVELTY - The method for preparing iron ion-doped tetramanganese tetroxide/multilayer graphene composite material involves (a) mixing dimethylformamide and distilled water in a volume ratio of 8:2 as a mixed solvent, (b) adding expanded graphite and ultrasonically oscillating for 2-5 hours to obtain a multilayer graphene mixed solution, (c) adding manganese acetate tetrahydrate and ferrous chloride tetrahydrate to multilayer graphene mixed solution, stirring at 30 degrees C for 5-10 minutes, pouring the solution into a hydrothermal reactor, hydrothermally reacting at 100-130 degrees C for 2-5 hours and cooling to room temperature, and (d) taking out reactants, washing with alcohol and distilled water 3-5 times and then dried in a drying oven at 60 degrees C for 24 hours to obtain the composite material. USE - Method is useful for preparing iron ion-doped tetramanganese tetroxide/multilayer graphene composite material, which is useful as a cathode material for lithium battery (all claimed). ADVANTAGE - The composite material has excellent electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for iron ion-doped tetramanganese tetroxide/multilayer graphene composite material prepared by the above method.