1. Department of Chemical & Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
2. Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
3. Materials Sciences Division, Joint Center for Energy Storage Research, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
4. College of Chemistry NMR Facility, University of California, Berkeley, CA, 94720, USA