摘要：通过高频感应等离子蒸发凝聚法制备得到的纳米Si粉结晶性好, 球形度高, 表面光滑, 比表面积为40.03 m²/g, 平均粒径为64.05 nm。以乙二醇和去离子水为分散介质, 制备了质量分数10%的纳米Si粉分散液, 在乙二醇体系中纳米Si粉颗粒的分散稳定性更好, 分散粒径更小, 粒度分布为94.17¹52.88 nm。以纳米Si粉乙二醇分散液与石墨 (G) 复合调浆制备的m (G) :m (Si) =9:1的复合负极材料电化学性能更优, 首次放电比容量为812.5 mA·h/g, 可逆充电比容量可达631.0 mA·h/g, 30次循环后的容量保持率为73.74%。

关键词：纳米Si粉；分散性；复合负极材料；电化学性能

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