Si-C复合薄膜的制备及电化学性能研究

Preparation and Electrochemical Properties of Si-C Thin Film

采用磁控溅射法,通过控制其中石墨薄膜的溅射时间,在铜箔集流体上沉积了三种不同厚度的Si-C复合薄膜。运用原子力显微镜(AFM)和扫描电子显微镜(SEM)对样品表面形貌和结构进行分析。运用恒电流充放电和循环伏安等方法研究了复合薄膜作为锂二次电池负极材料的电化学性能。结果表明,随着石墨溅射时间的增加,复合薄膜循环性能呈上升趋势,对比纯Si薄膜,石墨的复合添加明显改善了薄膜的循环性能。

Three kinds of Si-C thin films as anodes of lithium ion battery were fabricated by magnetic puttering with different sputtering tinre of graphite. Surface morphology and structures of the films were investigated by atomic force microscopy （AFM） and scanning electron microscopy （SEM）. In the potential range 1.5-0.1 V （vs. Li＋/Li） at the current density of 0.1 mA/cm2, the results show that as the films with the cycle performance increase of graphite sputtering time in the rise. Compared with Si film, Si-C thin fihns have better electrochemical perfonnance.