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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (10): 1572-1576. 上一篇    下一篇

研究论文

锂离子电池用硅/碳复合负极材料

王保峰;杨军;解晶莹;王可;文钏晟;喻献国   

  1. 中国科学院上海微系统与信息技术研究所
  • 发布日期:2003-10-15

Si/C Composite negative Electrode material for Lithium Ion Batteries

Wang Baofeng;Yang Jun;Xie Jingying;Wang Ke;Wen Zhangsheng;Yu Xianguo   

  1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
  • Published:2003-10-15

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1378

被引次数

86 | 14

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 逆比窝容量500mAh·g~（-1）左右，30次循环后容量维持在90%以上。另外，该复 合材料充放电平台经目前锂离子电池广泛采用的中间相碳微球（CMS）高0.15V左右 ，这有助于提高电池的充电倍率性能和操作安全性。

关键词: 碳, 复合材料, 锂离子, 热解, 聚氯乙烯, 电池

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 0.15V against that of the commercialized CMS negative electrode material, which is favorable for enhancing the charging rate and operating safety of the cell.

Key words: CARBON, COMPOSITE MATERIALS, LITHIUM ION, THERMOLYSIS, POLYVINYL CHLORIDE, BATTERIES

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