▎ 摘　　要

NOVELTY - Preparing carbon/graphene/lithium titanate composite cathode material comprises (1) adding 100-130 volume units of concentrated sulfuric acid into the three-necked flask, placing into vacuum oven and drying, and obtaining graphene oxide, (2) (2-1) dissolving 3-5 volume units of the titanium source composite in 15-30 volume units of isopropanol to obtain solution a, and dissolving 0.5-2 mass units of lithium source composite in 15-30 volume units of absolute ethanol to obtain solution c, (2-2) adding solution a to dispersion b, ultrasonically treating for 0.5-1.5 hours, adding solution c, and grinding it to obtain powder, and (2-3) calcining the powder at high temperature under protective atmosphere, and (3) adding the graphene/lithium titanate composite material obtained by the phenolic resin and step (2) into absolute ethanol, and obtaining carbon/graphene/lithium titanate composite cathode material. USE - The method is useful for preparing carbon/graphene/lithium titanate composite cathode material. ADVANTAGE - The method: is simple in operation, economical, non-toxic and pollution-free; reduces the defects at the edge of graphene; is beneficial to maintain the reactivity of each component in the composite material; exhibits excellent electrochemical performance; and has great practical value. DETAILED DESCRIPTION - Preparing carbon/graphene/lithium titanate composite cathode material comprises (1) adding 100-130 volume units of concentrated sulfuric acid into the three-necked flask, adding the graphite powder of 3-8 mass units, potassium permanganate of 10-20 mass units and sodium nitrate of 1.5-4 mass units when the temperature in the bottle drops to 3-7℃, reacting 1-3 hours at water bath temperature 0-5℃, adding the water of 200-250 volume units in the above-mentioned system after the reaction finishes, at the same time, adjusting the temperature of the water bath to 95-100℃, continuously adding 280-320 volume units of water after the temperature in the bottle is stable, adding hydrogen peroxide until the solution turns bright yellow when the temperature of the water bath drops to 30-40℃, stopping adding, filtering and washing product to neutrality, placing into vacuum oven and drying, and obtaining graphene oxide, (2) (2-1) dissolving 3-5 volume units of the titanium source composite in 15-30 volume units of isopropanol to obtain solution a, dispersing the graphene oxide obtained in the step (1) 0.05-0.2 mass units in 8-12 volume units of water to obtain dispersion b, and dissolving 0.5-2 mass units of lithium source composite in 15-30 volume units of absolute ethanol to obtain solution c, (2-2) adding solution a to dispersion b, ultrasonically treating for 0.5-1.5 hours, adding solution c, uniformly mixing and placing it into the reaction kettle, reacting at a constant temperature of 160-180℃ for 18-30 hours, centrifuging the mixed solution after the reaction, taking the precipitate, drying, and grinding it to obtain powder, and (2-3) calcining the powder at high temperature under protective atmosphere, and cooling to room temperature to obtain graphene/lithium titanate composite material, and (3) adding the graphene/lithium titanate composite material obtained by the phenolic resin and step (2) into absolute ethanol, stirring at room temperature, obtaining the mixed solution X, placing the mixed solution X into vacuum oven for drying, and solidifying the dried powder and carbonizing, cooling to room temperature, and obtaining carbon/graphene/lithium titanate composite cathode material, where the ratio of mass unit to volume unit is g/ml.