1. Center
for Nanochemistry (CNC), Beijing National Laboratory for Molecular
Sciences, 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. BTR New Energy Materials Inc., Shenzhen 518106, P. R. China
3. Electron
Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, P. R. China
4. State
Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, P. R. China
5. Harbin Wanxin Graphite Valley Technology Co. Ltd., Harbin 150028, P. R. China