1. Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of Energy Soochow University Suzhou Jiangsu 215006 P. R. China
2. College of Chemistry and Chemical Engineering Nantong University Nantong Jiangsu 226019 P. R. China
3. Light Industry Institute of Electrochemical Power Sources Suzhou Jiangsu 215600 P. R. China