1. College of Materials Science and Engineering
2. Kunming University of Science and Technology
3. Kunming 650093
4. P. R. China
5. School of Physics and Opto-Electronic Technology
6. Baoji University of Arts and Sciences
7. Baoji 721016
8. People's Republic of China
9. Engineering Research Center of New Energy Storage Devices and Applications
10. Chongqing University of Arts and Sciences
11. Chongqing