1. State Key Laboratory of Silicon MaterialsKey Laboratory of Advanced Materials and Applications for Batteries of Zhejiang ProvinceDepartment of Materials Science and EngineeringZhejiang University Hangzhou 310027 P. R. China
2. State Key Laboratory of Marine Resource Utilization in South China SeaHainan University Haikou 570228 P. R. China
3. Department of PhysicsCity University of Hong Kong Hong Kong 999077 P. R. China
4. Shenzhen Research InstituteCity University of Hong Kong Shenzhen 518057 P. R. China
5. Department of Materials ChemistryHuzhou University Huzhou 313000 P. R. China