1. State Key Laboratory of Organic-Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical Technology Beijing 100029 P. R. China
2. State Key Laboratory of Advanced Chemical Power SourcesGuizhou Meiling Power Sources Co. Ltd. Zunyi Guizhou 563003 P. R. China
3. General Research Institute of Nonferrous Metals No.2 Xinjiekouwai Street Beijing 100088 P. R. China
4. China Automotive Battery Research Institute Co., Ltd No. 11 Xingke East Street Beijing 101407 P. R. China