▎ 摘　　要

NOVELTY - A graphene/tin oxide quantum dot composite electrode material is prepared by adding surfactant to aqueous suspension of graphene oxide and stirring until the surfactant is completely dissolved. The resulting suspension is diluted and added to hydrochloric acid solution of tin chloride to obtain a mixed solution. Urea aqueous solution is dropwisely added to the mixed solution and the resulting solution is diluting with water and reacted at 85-90 degrees C for 16 hours. The resulting precipitate is vacuum dried at 40 degrees C and calcined at 400-500 degrees C for 2 hours to obtain finished product. USE - Graphene/tin oxide quantum dot composite electrode material for a lithium ion battery. ADVANTAGE - The composite electrode material is prepared in a simple, controllable and economical manner with high conductivity, charging and discharging characteristics and cycle stability. DETAILED DESCRIPTION - A graphene/tin oxide quantum dot composite electrode material is prepared by adding 2.2-2.7 g surfactant to 70 ml aqueous suspension of graphene oxide having concentration of 10 g/l and stirring until the surfactant is completely dissolved, where the surfactant is chosen from citric acid, sodium lauryl sulfate and sodium dodecylbenzene sulfonate. The resulting suspension is diluted to 300 ml and added to 100 ml 0.12 mol/l hydrochloric acid solution of tin chloride having hydrochloric acid concentration of 3.8 wt.% to obtain a mixed solution. 45-50 ml urea aqueous solution having concentration of 1 mol/l is dropwisely added to the mixed solution and the resulting solution is diluting with water to 1000 ml and reacted at 85-90 degrees C for 16 hours under reflux conditions. The resulting precipitate is vacuum dried at 40 degrees C in argon gas atmosphere and calcined at at 400-500 degrees C for 2 hours to obtain finished product.