1. Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 P. R. China
2. Analytical and Testing Center Jiangxi Normal University Nanchang 330022 P. R. China
3. Department of Physics Laboratory of Computational Materials Physics Jiangxi Normal University Nanchang 330022 P. R. China
4. Department of Chemistry University of Science and Technology of China Hefei 230026 P. R. China