1. School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) Tianjin University Tianjin 300350 P. R. China
2. National Industry-Education Platform of Energy Storage Tianjin University 135 Yaguan Road Tianjin 300350 P. R. China
3. School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin 150080 P. R. China
4. School of Chemical Engineering and Advanced Materials The University of Adelaide Adelaide South Australia 5005 Australia
5. Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
6. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 P. R. China