▎ 摘　　要

NOVELTY - Preparation of lithium-nickel-manganese oxide/graphene composite material involves mixing manganese dioxide, nickel oxide and lithium carbonate in a ratio of 300:100:102.5, ball-milling for 1-3 hours to obtain sodium-nickel-manganese-lithium hydride, adding water, reacting at 700-900 degrees C for 12-48 hours, stirring evenly by ultrasonically processing, adding hydrazine hydrate, stirring at 70-90 degrees C for 3-10 hours in water bath to obtain lithium nickel manganese oxide/graphene suspension and freeze-drying for 24-72 hours. USE - Preparation of lithium-nickel-manganese oxide/graphene composite material used in preparation of cathode material for lithium ion battery (claimed). ADVANTAGE - The method enables simple, economical and energy-efficient preparation of lithium-nickel-manganese oxide/graphene composite material with micro/nanostructure.