1. Division of Physics and Applied Physics
2. School of Physical and Mathematical Sciences
3. Nanyang Technological University
4. Singapore 637371
5. Singapore
6. School State Key Laboratory of Silicon Materials
7. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering
8. Zhejiang University
9. Hangzhou 310027
10. China
11. School of Materials Science & Engineering
12. Singapore 639798
13. State Key Laboratory of Coal Conversion
14. Institute of Coal Chemistry
15. Chinese Academy of Science
16. Taiyuan 030001
17. P. R. China