1. Research Center for Biomimetic Functional Materials and Sensing Devices; Institute of Intelligent Machines; Chinese Academy of Sciences; Hefei Anhui 230031 P. R. China
2. Department of Materials Science and Engineering; Frederick Seitz Materials Research Laboratory; Beckman Institute for Advanced Science and Technology; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
3. Department of Chemistry; Pennsylvania State University; University Park; PA 16802 USA
4. Xerion Advanced Battery Corp; Champaign IL 61820 USA