A silvery carbon doped - Preparation silicon composite negative electrode material

The method of preparing a negative electrode silicon composite material, comprising the steps of - The present invention relates to a carbon-doped silver: (1) preparing a carbon - silicon composite material; (2) the above carbon - silicon composite material is added to an ethylene glycol solution, ultrasound, filtration, washing, drying, grinding, ball milling, sieving, standby; weighed mass of the corresponding polyvinylpyrrolidone and AgNO3 dissolved in ammonia solution, stirred; configuration, potassium borohydride solution, distilled water and aqueous ammonia is configured to the mother liquor was placed in a reaction vessel, and the spare carbon - silicon composite material while placed in the mother liquor, stirring, and a mixed solution of polyvinylpyrrolidone and AgNO3 solution of potassium borohydride was added dropwise to the mother liquor, the reaction product was centrifuged , precipitate was removed, diluted, filtered off with suction and washed, and dried to obtain a carbon-doped silver - silicon composite negative electrode material. Preparation of the lithium ion battery of the present invention is more excellent conductivity doped Ag, such that both high capacity and high conductivity, high cycling stability characteristics.