1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 P. R. China
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
3. Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry and College of Chemistry Jilin University Changchun 130012 P. R. China
4. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637616 Singapore