1. National and Local United Engineering Laboratory for Power Batteries; Faculty of Chemistry; Northeast Normal University; Changchun Jilin 130024 P. R. China
2. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology; CAS Research/Education Center for Excellence in Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences (CAS); Beijing 100190 P. R. China
3. School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
4. School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
5. Stanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park CA 94025 USA
6. Department of Chemistry; University of California; Berkeley CA 94720 USA