1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China
2. Graduate School of Engineering, Toin University of Yokohama, Kanagawa 225-8503, Japan
3. Graduate School of Life Sciences, Ritsumeikan University, Shiga 525-8577, Japan
4. Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga 526-0829, Japan
5. Electron Microscopy Center, Jilin University, Changchun 130012, China