1. Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences 266101 Qingdao P. R. China
2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences 100049 Beijing P. R. China
3. College of Electromechanical Engineering Qingdao University of Science and Technology 266061 Qingdao P. R. China
4. School of Future Technology University of Chinese Academy of Sciences 100049 Beijing P. R. China