▎ 摘　　要

NOVELTY - The method involves taking choline chloride and ethylene glycol to obtain base solution, and uniformly mixing the choline chloride, ethylene glycol and the graphene oxide to obtain mixed solution. The stannous chloride is added to the mixed solution. The ultrasonic oscillation reaction is carried out to obtain the tin dioxide/graphene composite cathode material of lithium ion battery by post-processing. Mass ratio of the stannous chloride to the graphite oxide is 20 to 80: 1. Mass percentage of the choline chloride in the mixed solution is 43 percent to 62.99 percent. USE - Method for preparation of tin dioxide/graphene composite cathode material of lithium ion battery. ADVANTAGE - The method improves the electrochemical property and wide market application prospect of the composite cathode material of lithium ion battery. The method uses simple the raw material composition, carries out at mild reaction condition at normal temperature and normal pressure, controls the reaction condition, ensures simple and easy preparation process, and improves the large scale industrial production of the composite cathode material. DESCRIPTION OF DRAWING(S) - The drawing shows a graph illustrating the charging and discharging cycle of the lithium-ion battery.