摘要
采用高能球磨法制备得到了Si/Co/C负极材料,并研究了其组成对电化学循环性能的影响.XRD结果表明,3种元素只以单质形式存在.充放电曲线结果表明,材料中Si和C为活性物质,Co为非活性物质.恒流充放电结果显示,当3者的重量比为20∶30∶50时形成的Si20Co30C50材料表现出了较好的电化学循环性能,其首周放锂容量和吸锂容量分别为877.6和1 038.7mAh/g,首周库伦效率为84.5%;循环50周后容量仍可以保持为581.2mAh/g.
A series of Si/C.Si/Co.C/Co and Si/Co/C anode materials with different weight ratios have been prepared by a high energy ball-milling method, and the optimized composi- tions are investigated. The XRD results indicate that no any compound is formed among the el- ementals Si, Co and C. The electrochemical galvanostatic charge and discharge results show that Si and C are active components and Co is inactive one. When the weight ratio of the ele- ments Si/Co/C is equals to 20 : 30 : 50, its initial charge/discharge capacity is 877. 6 and 1 038.7 mAh/g, respectively, corresponding to a coulombic efficiency of 84.5 %. After 50 cy- cles, the remained capacity reaches 581.2 mAh/g.
出处
《南开大学学报(自然科学版)》
CAS
CSCD
北大核心
2014年第1期87-91,共5页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
国家高技术研究发展规划(2011AA11A255)
天津市应用基础及前沿课题(13JCZDJC32000)
关键词
锂离子电池
负极材料
高能球磨法
SI
CO
C材料
循环性能
Li-ion hattery s anode materials high energy ball-mi|[ing methods Si/Co/C materia|s cycleperformance