1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
2. Division of Material Science and Technology, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
3. Department of Chemistry, Brown University, Providence, Rhode Island 02912
4. Technology & Development Division, Hitachi Maxell Ltd., Ibaraki 300-2496, Japan
5. School of Engineering, Indiana University-Purdue University, Indianapolis, Indiana 46202
6. Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439