1. School of Materials Science and Engineering, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, Anhui 230009, P. R. China
2. Chery New Energy Automobile Co., Ltd., Wuhu, Anhui 241003, P. R. China
3. Instrumental Analysis Center, Hefei University of Technology, Hefei, Anhui 230009, P. R. China