1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)Jilin Engineering Laboratory for New Energy Materials and TechnologyCollege of PhysicsJilin University Changchun 130012 P. R. China
2. State Key Laboratory of Supramolecular Structure and MaterialsCollege of ChemistryJilin University Changchun 130012 P. R. China
3. State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin University Changchun 130012 P. R. China