1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
2. Joint Center for Energy Storage Research (JCESR), Lemont, Illinois 60439, United States
3. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
4. Applied Energy Division, SLAC National Laboratory, Menlo Park, California 94025, United States