▎ 摘　　要

NOVELTY - Preparing reduced graphene oxide modified ferrouso-ferric oxide-tin dioxide composite material comprises e.g. providing 20 mmol ferrous sulfate heptahydrate and 20 mmol ascorbic acid, dissolving in 700 ml deionized water, labelling as solution A, taking 20 mmol tin(IV) chloride pentahydrate, dissolving in 100 ml absolute ethanol, labelling as solution B, dissolving 8.05 g sodium hydroxide, dissolving in 100 ml deionized water, labelling as solution C, adding solution B to solution A, placing the resulting mixed solution in an oil bath at 60 degrees C, stirring for reaction for 40 minutes, pouring the solution C, continuously reacting for 1 hours, washing the obtained sample with deionized water to neutrality to obtain natanite, placing in a tube furnace under argon atmosphere for the heat treatment at 200 degrees C, 350 degrees C and 400 degrees C for 1 hours to prepare porous cubic box natanite, providing 0.4 g the porous cubic box natanite, and ultrasonically dispersing. USE - The composite material is useful as cathode material for lithium ion batteries (claimed). ADVANTAGE - The composite material : has high capacity and good cycle stability. The method: provides a synthesis strategy of in-situ co-doping of different kinds of oxides, which provides reference significance for obtaining materials with high capacity, high magnification and cycle stability. DETAILED DESCRIPTION - Preparing reduced graphene oxide modified ferrouso-ferric oxide-tin dioxide composite material comprises (1) providing 20 mmol ferrous sulfate heptahydrate and 20 mmol ascorbic acid, dissolving in 700 ml deionized water, labelling as solution A, taking 20 mmol tin(IV) chloride pentahydrate, dissolving in 100 ml absolute ethanol, labelling as solution B, dissolving 8.05 g sodium hydroxide, dissolving in 100 ml deionized water, labelling as solution C, adding solution B to solution A, placing the resulting mixed solution in an oil bath at 60 degrees C, stirring for reaction for 40 minutes, pouring the solution C, continuously reacting for 1 hours, washing the obtained sample with deionized water to neutrality to obtain natanite, placing in a tube furnace under argon atmosphere for the heat treatment at 200 degrees C, 350 degrees C and 400 degrees C for 1 hours to prepare porous cubic box natanite, (2) providing 0.4 g the porous cubic box natanite, ultrasonically dispersing in 100 ml deionized water, adding 0.2 g dopamine hydrochloride, adding 0.121 g trihydroxyaminomethane, finally in a magnetic stirring for reacting for 12 hours, washing with deionized water to neutrality, carbonizing the resulting product in an argon atmosphere, raising the temperature to 400 degrees C at a heating rate of 2 degrees C/minutes, maintaining the temperature for 2.5 hour to prepare a composite material, and (3) taking 0.32 g composite material, dispersing it ultrasonically in 30 ml deionized water, adding 55 mg graphene oxide, freeze-drying, using the resulting product at 400 degrees C with a volume ratio of 19: 1, heat treating under argon and hydrogen mixed atmosphere to produce reduced graphene oxide modified ferrouso-ferric oxide-tin dioxide composite material, where the graphene oxide is prepared by traditional Hummers method.