1. College of Environmental and Chemical EngineeringDalian JiaoTong University, Dalian 116028, P.R. China
2. New Energy and Technology Management DepartmentSAIC Motor, Shanghai 200041, P.R. China
3. Material Property Test Center of Key Laboratory of Ship-Machinery Maintenance and ManufactureDalian Maritime University, Dalian 116026, P.R. China
4. Dalian Sunrise Power Co. Ltd, Dalian 116085, P.R. China
5. Department of PhysicsDalian Maritime University, Dalian 116026, P.R. China