▎ 摘　　要

NOVELTY - Preparation of dual-modified carboxylatotin/graphene nanocomposite anode material involves preparing nano carbon balls using glucose powder, dissolving in deionized water, ultrasonically dispersing, obtaining a nano carbon ball dispersion, adding a tin salt solution to the nano carbon ball dispersion, ultrasonically dispersing, hydrothermally reacting, isolating solid product, drying, obtaining a carboxylatotin powder, heat-treating, adding to a graphene oxide aqueous solution, ultrasonically dispersing, hydrothermally reacting, obtaining a black product, drying, and grinding. USE - Preparation of dual-modified carboxylatotin/graphene nanocomposite anode material (claimed). ADVANTAGE - The method enables preparation of dual-modified carboxylatotin/graphene nanocomposite anode material having excellent lithium storage performance and cycle characteristics at high current density. DETAILED DESCRIPTION - Preparation of dual-modified carboxylatotin/graphene nanocomposite anode material involves preparing nano carbon balls by adding glucose powder to deionized water, magnetically stirring for 10 minutes, obtaining an aqueous solution of glucose, pouring the resultant product to a polytetrafluoroethylene reactor, sealing, heating, centrifuging, obtaining a solid phase product, washing, centrifuging, washing the filtrate, washing obtained solid product, drying in vacuum and grinding, dissolving the nano carbon balls in deionized water, ultrasonically dispersing, obtaining 5 g/L nano carbon ball dispersion, dissolving tin salt in deionized water, obtaining 0.01-0.06 mol/L tin salt solution, adding the tin salt solution to the nano carbon ball dispersion, ultrasonically dispersing, hydrothermally reacting, isolating solid product by centrifugation, washing the solid , drying, obtaining carboxylatotin powder, heat-treating, obtaining a carboxylatotin composite material, adding the resultant product to 1 mg/mL graphene oxide aqueous solution, ultrasonically dispersing, obtaining a mixed solution, transferring the mixed solution to a high pressure microwave reactor, hydrothermally reacting in a microwave power of 700-1200 W, obtaining a black product, naturally sedimenting, washing the obtained black product, drying, and grinding. The mass-volume ratio of the glucose powder and deionized water is (2-8) g:30 mL. The volume ratio of the tin salt solution and the carbon nano ball dispersion is (6-14):20. The mass ratio of the carboxylatotin composite material and graphene oxide of the graphene oxide aqueous solution is (1-20):1.