1. Key Laboratory for the Physics and Chemistry of NanodevicesBeijing Key Laboratory for Theory and Technology of Advanced Battery MaterialsDepartment of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871P. R. China
2. Department of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081P. R. China
3. Research School of EngineeringThe Australian National UniversityCanberra ACT 2601Australia