1. Center for Nanochemistry,
Beijing National Laboratory for Molecular Sciences (BNLMS), State
Key Laboratory for Structural Chemistry of Unstable and Stable Species,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
2. State Key Laboratory
of Silicon Materials, Key Laboratory of Advanced Materials and Applications
for Batteries of Zhejiang Province, Department of Materials Science
and Engineering, Zhejiang University, Hangzhou 310027, P. R. China