1. Joint Center for Energy Storage Research, Argonne, Illinois 60439, United States
2. Material, Physical and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87158, United States
3. Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
5. Department of Materials Science, University of California Berkeley, Berkeley, California 94720, United States