1. Department of Mechanical and Materials Engineering; University of Western Ontario; London Ontario N6A 5B9 Canada
2. Hefei National Laboratory for Physical Science at Microscale; Department of Chemistry; University of Science and Technology of China; Hefei Anhui 230026 P. R. China
3. Department of Physics and Astronomy; University of Western Ontario; London Ontario N6A 3K7 Canada
4. China Automotive Battery Research Institute; 5th Floor, No. 43, Mining Building, North Sanhuan Middle RoadHaidi-an District Beijing 100088 P. R. China