锂离子电池用硅-石墨/炭复合负极材料的电化学性能研究（英文）

Electrochemical Performances of Si-graphite / carbon Composites as Anode Materials for Lithium-Ion Batteries

以纳米硅、石墨和马铃薯淀粉为原料制备硅-石墨/炭复合负极材料,探讨复合材料的制备工艺对其电化学性能的影响,并采用扫描电镜和X-射线衍射法对材料的颗粒形貌和微晶结构进行表征。研究表明:当复合材料中m(Si)/m(graphite)为1∶4,球磨时间为10 h时,复合材料经20次循环后其可逆容量仍为466 mA·h/g,显示出良好的电化学性能,进一步分析表明纳米硅和石墨均对复合材料的可逆容量做出贡献,而且复合材料中含量较高的石墨的颗粒形貌和微晶结构对其电化学性能起关键性作用。

Using nano-Si, graphite and potato starch as raw materials, Si-graphite /carbon composites were prepared in this paper. The effects of preparation conditions of the composites on their electrochemi- cal performances were investigated. The morphology and crystalline structure of composites were further studied by scanning electron microscopy and X-ray diffractometer. The results show that the composite prepared under the optimum condition （m（Si）/m（graphite） in composite is 1：4, milling time is 10 h） shows a good cycling performance with a reversible capacity of 466 mA. h/g after 20 cycles. The follow- ing analysis indicates that both nano-Si and graphite in composite contribute to the total reversible capaci- ty. Moreover, the morphology and crystalline structure of graphite with higher content in the composites are the key factors affecting the capacity of the composites.