1. School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
2. Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
3. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, Department of Physics, Jilin University, Changchun 130012, China