摘要
以聚氯乙烯 (PVC)、纳米硅粉和小粒径的人造石墨为前驱物 ,利用高温热解反应 ,使纳米的硅和石墨微粒高度均匀地分散在PVC热解产生的碳中 ,形成一种新型硅碳复合嵌锂材料 .电化学测试表明 :该复合材料首次充放电效率约为84% ,可逆比容量 70 0mAh·g- 1左右 ,3 0次循环后容量维持在 90 %以上 .另外 ,该复合材料充放电平台比目前锂离子电池广泛采用的中间相碳微球 (CMS)高 0 15V左右 。
A novel Si/C composite negative electrode for lithium ion batteries was obtained by pyrolyzing the mixture of polyvinyl chloride, nano-Si powder and fine artificial graphite particles. Nano-Si and fine graphite are dispersed in carbon uniformly. Electrochemical test shows the first cycle efficiency of the composite is about 84% and the reversible capacity is about 700 mAh.g(-1). The capacity retention at the 30th cycle is more than 90%. In addition, the charge-discharge voltage plateau of the composite shifts toward positive direction for about 0.15 V against that of the commercialized CMS negative electrode material, which is favorable for enhancing the charging rate and operating safety of the cell.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第10期1572-1576,共5页
Acta Chimica Sinica
基金
国家"863"计划(NO.2002AA323060)资助项目
关键词
锂离子电池
硅/碳复合负极材料
高容量
热解
Si/C composite
anode materials
lithium ion battery
large capacity
pyrolysis
