1. Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, P. R. China
2. International Center for Quantum Materials & Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, P. R. China
3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R .China
4. Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing 100871, P. R. China