1. State Key Laboratory of Silicon Materials; Department of Materials Science and Engineering; Zhejiang University; Hangzhou 310027 P. R. China
2. Industrial Technology Research Institute of Zhejiang University; Hangzhou 310058 P. R. China
3. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province; Hangzhou 310027 P. R. China
4. School of Materials Science and Engineering; Beijing University of Aeronautics and Astronautics; Beijing 100191 P. R. China