Abstract：Si nano-powders were prepared by radio frequency inductively coupled plasma evaporation method, which were good crystalline and smooth surface spherical powders. Specific surface area and average grain diameter were 40.03 m²/g and 64.05 nm respectively. 10% Si nano-powders dispersion liquid with ethylene glycol and deionized water wsa prepared. It can be found that Si nano-powders in ethylene glycol has better dispersion and smaller particle size than in deionized water, particle size distribution is94.17¹52.88 nm. Silicon carbon composite cathode materials at m (G) : m (Si) ratio have better electrochemical performance, which are prepared through pulping with 10% Si nano-powers ethylene glycol dispersion and graphite. First discharge capacity is812.5mA·h/g, charge capacity is 631.0 mA·h/g, and capacity remain is 73.74% after 30 cycles.

Keywords: Si nano-powders; dispersion; composite anodes; electrochemical properties