▎ 摘　　要

NOVELTY - Preparation of lithium-ion battery nickel-manganese-lithium-graphene composite material includes mixing nickel sulfate, lithium acetate, manganese chloride and strontium nitrate, adding sodium hydroxide (NaOH) solution, controlling pH at 11-12, precipitating metal ions, performing suction filtration, washing, drying, dispersing graphite powder and concentrated sulfuric acid, adding hydrogen peroxide, mixing, adding concentrated sulfuric acid, mixing, washing, sealing stainless steel reactor in blast oven, drying, cooling, ball milling, sintering precursor and cooling to room temperature. USE - Method of preparing lithium-ion battery nickel-manganese-lithium-graphene composite material. ADVANTAGE - The method improves circulating stability, enhances electrical conductivity and has high specific capacity and long service life. DETAILED DESCRIPTION - Preparation of lithium-ion battery nickel-manganese-lithium-graphene composite material comprises mixing nickel sulfate, lithium acetate, manganese chloride and strontium nitrate at 0.5:1:1.42-1.45:0.05-0.08 with water, adding 4-5 mol/L sodium hydroxide (NaOH) solution, controlling pH at 11-12, precipitating metal ions, performing suction filtration, washing precipitate 3-5 times with deionized water, drying at 90-100 degrees C for 8-10 hours, dispersing graphite powder and 60 wt.% concentrated sulfuric acid, adding 25 wt.% hydrogen peroxide, mixing for 3-5 minutes at 50-55 degrees C, adding 60 wt.% concentrated sulfuric acid, mixing for 20-30 minutes, washing with 5-10% acetic acid solution, deionized water and ethylene glycol to obtain graphite oxide nanomaterial, pouring graphene oxide aqueous solution in stainless steel reaction vessel with liner, sealing stainless steel reactor in blast oven, drying, cooling stainless steel reactor to room temperature, using filter paper to draw water from the solution, placing in vacuum drying oven, drying, ball milling porous graphite material, sintering precursor, ball milling at 300-400 revolutions per minute (rpm) for 10-12 hours, mixing, sintering under argon atmosphere and cooling to room temperature.