Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1572-1576 |
| Number of pages | 5 |
| Journal | Acta Chimica Sinica |
| Volume | 61 |
| Issue number | 10 |
| State | Published - 2003 |
| Externally published | Yes |
Keywords
- Anode materials
- Large capacity
- Lithium ion battery
- Pyrolysis
- Si/C composite
