1. State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
2. Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
3. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
4. Institute of Thermal Science and Power Systems School of Energy Engineering Zhejiang University Hangzhou 310027 P. R. China
5. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310013 P. R. China
6. Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd. Liyang 213300 P. R. China