1. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China
2. Jiansu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China
3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, China