1. Beijing Key Laboratory of Environmental Science and Engineering; School of Materials Science and Engineering; Beijing Institute of Technology; Beijing 100081 P. R. China
2. Stanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park CA 94025 USA
3. Beijing Synchrotron Radiation Facility; Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049 P. R. China
4. Collaborative Innovation Center of Electric Vehicles in Beijing; Beijing 100081 P. R. China