1. Institute of Energy Storage Technology Changsha University of Science & Technology Changsha 410114 P. R. China
2. College of Materials Science and Engineering Changsha University of Science & Technology Changsha 410114 P. R. China
3. Huzhou Power Supply Company of State Grid Zhejiang Electric Power Company Ltd. Huzhou 313000 P. R. China
4. Huzhou Electric Power Design Institute Company Ltd. Huzhou 313000 P. R. China