1. Engineering Laboratory for Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen; Tsinghua University; Shenzhen 518055 P.R. China
2. School of Materials Science and Engineering; Tsinghua University; Beijing 100084 P.R. China
3. College of Materials Science and Engineering; Shenzhen University and Shenzhen Key Laboratory of, Special Functional Materials; Shenzhen 518060 P.R. China
4. Department of Electronic Engineering; The Chinese University of Hong Kong; Shatin, New Territories Hong Kong SAR P.R. China
5. School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta Georgia 30332 USA