1. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
2. Department of Chemistry, University of California, Berkeley, CA 94720, USA.
3. Joint Center for Energy Storage Research, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
5. Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA.
6. Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.