作　　者： ; ; ;

机构地区： 四川大学材料科学与工程学院

出　　处： 《功能材料》 2012年第5期657-659,共3页

摘　　要： 采用湿法混料及高温热解法制备了锂离子电池用硅/石墨/碳复合负极材料,并研究了不同配方的复合材料结构及电化学性能。研究发现,硅含量为20%(质量分数)时,复合材料首次可逆容量为865mAh/g,循环30次后仍为757mAh/g,容量保持率可达88%,大大改善了硅基材料作为锂离子电池负极材料的电化学性能。 The Si/graphite/carbon composites were prepared through wet milling technique followed by pyrolysis method in this work. The phase structures, electrochemical performances and kinetics of the as-prepared composites were analyzed respectively. The effect of different components ratio on cycling performance was investigated specially. The results showed that the composites consisted of 20wt% Si and 30wt% graphite exhibited the best overall performances, in which the first reversible capacity was up to 865mAh/g with Coulomb efficiencvof69%, and the capacity retention after 30 cycles was 88%.

关 键 词： 锂离子电池 硅基复合材料 负极

领　　域： [电气工程]