Silicon/flake graphite/carbon anode materials prepared with different dispersants by spray-drying method for lithium ion batteries  

分散剂对喷雾干燥制备硅/鳞片石墨/热解炭复合负极材料的影响(英文)

作　　者：赖浚[1] 郭华军[1] 李向群[1] 王志兴[1] 李新海[1] 张晓萍[1] 黄思林[1] 甘雷[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第5期1413-1420,共8页中国有色金属学报（英文版）

基　　金：Project(2011FJ1005)supported by the Science and Technology Programs of Hunan Province,China

摘　　要：Silicon/flake graphite/carbon （Si/FG/C） composites were synthesized with different dispersants via spray drying and subsequent pyrolysis, and effects of dispersants on the characteristics of the composites were investigated. The structure and properties of the composites were determined by X-ray diffractometry （XRD）, scanning electron microscopy （SEM） and electrochemical measurements. The results show that samples have silicon/flake graphite/amorphous carbon composite structure, good spherical appearances, and better electrochemical performance than pure nano-Si and FG/C composites. Compared with the Si/FG/C composite using washing powder as dispersant, the Si/FG/C composite using sodium dodecyl benzene sulfonate （SDBS） as dispersant has better electrochemical performance with a reversible capacity of 602.68 mA·h/g, and a capacity retention ratio of 91.58 % after 20 cycles.采用喷雾干燥及热解法制备硅/鳞片石墨/热解炭复合负极材料,研究分散剂对材料的影响。材料结构与性能通过XRD、SEM及电化学测试来表征。实验结果表明:材料具有硅/鳞片石墨/热解炭复合结构及规则的球形表面,其电化学性能比纯硅有明显的改善。与采用洗衣粉作为分散剂制备的复合材料相比,采用SDBS作为分散剂制备的复合材料具有更好的电化学性能,其可逆比容量达到602.68mA·h/g,经20次循环后容量保持率高达91.58%。

关 键 词：lithium ion battery Si/C composite spray drying ANODE 

分 类 号：TB33[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]