Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 30, Pages 8684-8687Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201501443
Keywords
electrochemistry; electrolyte optimization; ESR spectroscopy; nonaqueous redox flow batteries; radicals
Categories
Funding
- U.S. Department of Energy's (DOE's) Office of Electricity Delivery and Energy Reliability (OE) [57558]
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- William R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility - DOE's Office of Biological and Environmental Research [48374, 48293]
- DOE [DE-AC05-76L01830]
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Nonaqueous redox flow batteries hold the promise of achieving higher energy density because of the broader voltage window than aqueous systems, but their current performance is limited by low redox material concentration, cell efficiency, cycling stability, and current density. We report a new nonaqueous all-organic flow battery based on high concentrations of redox materials, which shows significant, comprehensive improvement in flow battery performance. A mechanistic electron spin resonance study reveals that the choice of supporting electrolytes greatly affects the chemical stability of the charged radical species especially the negative side radical anion, which dominates the cycling stability of these flow cells. This finding not only increases our fundamental understanding of performance degradation in flow batteries using radical-based redox species, but also offers insights toward rational electrolyte optimization for improving the cycling stability of these flow batteries.
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