▎ 摘　　要

NOVELTY - Tin dioxide-chromium oxide-graphene composite material comprises 10 pts. wt. graphene oxide, 5 pts. wt. polyethylene oxide-polyoxypropylene-polyethylene oxide triblock copolymer P123, 30 pts. wt. tin tetrachloride pentahydrate, 30 pts. wt. potassium dichromate and 5 pts. wt. pyrrole. USE - Tin dioxide-chromium oxide-graphene composite material used for preparing lithium ion battery anode (claimed). ADVANTAGE - The product has excellent circulation performance and good structure stability. DETAILED DESCRIPTION - Tin dioxide-chromium oxide-graphene composite material comprises 10 pts. wt. graphene oxide, 5 pts. wt. polyethylene oxide-polyoxypropylene-polyethylene oxide triblock copolymer P123, 30 pts. wt. tin tetrachloride pentahydrate, 30 pts. wt. potassium dichromate and 5 pts. wt. pyrrole. The graphene oxide is prepared by mixing 0.5 g expanded graphite and 60 ml concentrated sulfuric acid, adding 0.5 g sodium nitrate, and 3 g mixture of potassium permanganate and potassium perchlorate, stirring overnight, pouring solution into 240 ml distilled water, stirring, cooling, placing into beaker, adding 10 ml of 30% hydrogen peroxide to obtain a bright yellow graphene oxide solution, centrifuging and washing with distilled water for 4-5 times to get brown oxide yellow graphene sol where ratio of potassium permanganate and potassium perchlorate is 7-9:1 (pts. wt.). An INDEPENDENT CLAIM is included for preparation of tin dioxide-chromium oxide-graphene composite material comprising dissolving polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer P123 in 100 ml water, stirring vigorously to produce large number of foam, adding graphene oxide, stirring for 30 minutes to obtain yellow oxide graphene solution, placing in water bath at 80 degrees C, adding tin tetrachloride pentahydrate and potassium dichromate, stirring for 10 minutes, adding pyrrole, filtering, washing and drying in water bath at 80 degrees C for 12 hours, transferring precursor into nitrogen atmosphere tubular furnace and calcining at 1000 degrees C for 2 hours.