摘要
采用磁控溅射法,通过控制其中Si薄膜的溅射时间,在铜箔集流体上沉积了4种不同Si厚度的Si-Al-Si夹层结构复合薄膜。采用原子力显微镜(AFM)和扫描电子显微镜(SEM)以及能谱仪(EDS)分析样品表面形貌和结构。采用恒电流充放电和慢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Si溅射时间的延长,复合薄膜首周放电容量增加,不可逆容量损失也增加;Si-Al-Si复合薄膜作为锂离子电池负极材料的循环性能随着Si溅射时间的延长而变差,但与纯Si薄膜相比,Al的加入明显降低了首周不可逆容量损失,改善了Si薄膜的循环性能。
Four kinds of Si-A1 Si thin films as anodes of lithium ion battery were fabricated by magnetron sput- tering with different sputtering time of Si. Surface morphology and structures of the films were investigated by atomic force microscopy（AFM）, scanning electron microscopy（SEM） and energy dispersive spectrometry（EDS）. Their li- thium electrochemical properties have been investigated by charge/discharge measurement and cyclic voltammetry. The results show that as the films with the discharge capacity and initial irreversible capacity increase of Si sputtering time in the rise, but cycle performance was decreased. Compared with pure Si thin film, the introduction of A1 to Si improved the cycle performance of the Si film.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2013年第8期44-47,共4页
Materials Reports
基金
湖北省教育厅青年人才项目(Q201211012)
