1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education)State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin University Changchun 130012 P. R. China
2. College of Materials Sciences and EngineeringKey Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of Technology Beijing 100124 P. R. China
3. Beijing Key Lab of Microstructure and Property of SolidsInstitute of Microstructure and Properties of Advanced MaterialsBeijing University of Technology Beijing 100124 P. R. China