1. Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
2. Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga 526-0829, Japan
3. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, P. R. China