1. State Key Laboratory of Silicon Materials Key Laboratory of Novel Materials for, Information Technology of Zhejiang Province and Key Laboratory of Advanced Materials, and Applications for Batteries of Zhejiang Province School of Materials Science and Engineering Zhejiang University Hangzhou, Zhejiang P. R. China
2. Institute for Superconducting and Electronic Materials Australian Institute of Innovative Materials University of Wollongong Wollongong NSW 2522 Australia
3. Guotai Junan Securities Co. Ltd. Shanghai 200120 P. R. China
4. Faculty of Materials Science and Chemical Engineering Ningbo University Ningbo 315211, Zhejiang P. R. China