1. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba 263-8522, Japan
2. Battery Material Development Center, Lithium Battery Material Department, Idemitsu Kosan Co., Limited, 1280 Kami-izumi, Sodegaura, Chiba 299-0293, Japan
3. JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan