Preparation method of stannic oxide particle/graphene nano-composite negative electrode material

The invention discloses a preparation method of a stannic oxide particle/graphene nano-composite negative electrode material. The preparation method comprises the following steps of (1) dissolving a tin source into absolute ethyl alcohol to prepare a tin-containing ethanol solution; (2) conducting ultrasonic treatment on graphene oxide, and evenly dispersing in deionized water to form a graphene oxide solution; (3) adding dropwise the tin-containing ethanol solution into the graphene oxide solution through stirring at a certain temperature, and continuously stirring for a certain period of time to obtain a mixed solution; (4) centrifugally separating and rinsing the obtained mixed solution, drying an obtained precipitate, thermally treating for a period of time at a certain temperature in the protective atmosphere, and obtaining the stannic oxide particle/graphene nano-composite negative electrode material after furnace cooling. The preparation method is simple, is low in cost and is environmental friendly; and the obtained stannic oxide particle/graphene nano-composite negative electrode material is high in reversible capacity, good in charge and discharge characteristics, and long in cycle life.