1. State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
2. State Key Laboratory of Coal Conversation Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 P. R. China
3. College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou Zhejiang 310018 P. R. China