1. Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, P. R. China
2. Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, P. R. China
3. Center for High Pressure Science & Technology Advanced Research, Beijing 100094, P. R. China
4. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
5. X-ray Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
6. Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, P. R. China
7. College of Physics, Qingdao University, Qingdao 266071, P. R. China