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