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. Department of Materials Chemistry Huzhou University Huzhou 313000 P. R. China
3. Department of Physics City University of Hong Kong Kowloon 999077 Hong Kong
4. College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 Zhejiang P. R. China