1. Depertment of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
2. Research Unit for Power Generation and Storage Materials, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
3. Research Unit for Development of Organic Superconductors, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
4. Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan