1. Guangdong Engineering & Technology Research Centre of Graphene‐like Materials and Products Department of Chemistry College of Chemistry and Materials Science Jinan University Guangzhou 510632 P. R. China
2. Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou 510632 P. R. China
3. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics Jilin University Changchun 130012 P. R. China
4. School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore