1. State Key Laboratory of Silicon Materials; Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province; School of Materials Science & Engineering; Zhejiang University; Hangzhou 310027 China
2. School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 637371 Singapore
3. Zhejiang University of Technology; Hangzhou 310014 China
4. School of Engineering Nanyang Polytechinic; 180 Ang Mo Kio Ave 8 Singapore 569830 Singapore