1. Key Laboratory of Physics and Technology for Advanced Batteries; Ministry of Education, Jinlin University; Changchun 130000 P. R. China
2. College of Science; Changchun University; Changchun 130000 P. R. China
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry; Jinlin University; Changchun 130000 P. R. China
4. State Key Laboratory of Superhard Materials; Jinlin University; Changchun 130000 P. R. China
5. College of Physics; Jinlin University; Changchun 130000 P. R. China