▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene tin oxide carbon composite anode material, comprises adding 6.4 ml gel containing 0.128 g graphene oxide into a beaker, adding n-butanol to prepare 32 ml solution, adding 0.6 ml concentrated hydrochloric acid, stirring, adding 0.6 mmol of tin chloride dihydrate under stirring, ultrasonically dispersing, transferring the prepared suspension into a hydrothermal reactor, carrying out hydrothermal reaction, cooling, washing the obtained precipitate with alcohol and water three times to obtain a graphene tin oxide composite, adding the graphene tin oxide composite into a 10 mM Tris solution, stirring, adding 0.15 g dopamine hydrochloride, stirring, centrifuging the solution, washing with deionized water and ethanol, pre-freezing the product, then transferring to a freeze dryer for lyophilization, heating the product to obtain coated carbide dopamine hydrochloride, and finally a nitrogen-doped carbon-coated graphene tin oxide composite anode material. USE - The method is useful for preparing three-dimensional graphene tin oxide carbon composite anode material (claimed). ADVANTAGE - The method alleviates the volume expansion of tin oxide during alloying and dealloying, and enhances the stability of the anode material of the lithium ion battery. DETAILED DESCRIPTION - Preparing three-dimensional graphene tin oxide carbon composite anode material, comprises adding 6.4 ml gel containing 0.128 g graphene oxide into a beaker, adding n-butanol to prepare 32 ml solution, adding 0.6 ml concentrated hydrochloric acid, stirring for 10 minutes, adding 0.6 mmol of tin chloride dihydrate under stirring, ultrasonically dispersing for 40 minutes, transferring the prepared suspension into a hydrothermal reactor, carrying out hydrothermal reaction at 180 degrees C for 2 hours, cooling to room temperature, washing the obtained precipitate with alcohol and water three times to obtain a graphene tin oxide composite, adding the graphene tin oxide composite into a 10 mM Tris solution, stirring for 10 minutes, adding 0.15 g dopamine hydrochloride, stirring at room temperature for 6 hours, centrifuging the solution, washing with deionized water and ethanol for 3 times, pre-freezing the product at -80 degrees C for 10 hours, then transferring to a freeze dryer for lyophilization for 48 hours, heating the product in a nitrogen atmosphere at a heating rate of 5 degrees C/minute to 550 degrees C for 3 hours to obtain coated carbide dopamine hydrochloride, and finally a nitrogen-doped carbon-coated graphene tin oxide composite anode material.