A SIOX-BASED ANODE MATERIAL AND ITS PREPARATION METHOD FOR LITHIUM ION BATTERY

摘要

The present invention relates to an SiO_x-based composite negative electrode material with high capacity, a method for producing the same, and a battery. The negative electrode material includes a silicon oxide material, a carbon material, and an amorphous carbon coating layer. The silicon oxide material is obtained by performing silicon oxide or carbon coating modification and is encircled by the surfaces of the carbon material. The method includes the steps of: obtaining the silicon oxide material in a micro-scale by performing physical processes or carbon coating modification on a silicon oxide raw material; and obtaining the negative electrode material with high capacity after mechanical fusion, solid phase coating, high temperature sintering in order. According to the present invention, silicon oxide particles in a micro-scale are uniformly dispersed and coated on the surfaces of the carbon material particles by a method whereby mechanical fusion and a solid phase coating technology are combined. The silicon oxide particles have excellent dispersion properties on the surfaces of the carbon material particles. Binding force of quantum is high. Circulation performance of a material is significantly increased. Initial efficiency is high. An expansion rate is low. The electrode material has high durability. The electrode material is produced by eco-friendly processes and thus dose not cause environmental pollution. Production costs of the electrode material are low.