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Radical Compatibility with Nonaqueous Electrolytes and Its Impact on an All‐Organic Redox Flow Battery

2015; Wiley; Volume: 54; Issue: 30 Linguagem: Inglês

10.1002/anie.201501443

1521-3773

Xiaoliang Wei, Wu Xu, Jinhua Huang, Lu Zhang, Éric Walter, Chad W. Lawrence, Vijayakumar Murugesan, Wesley A. Henderson, Tianbiao Liu, Lelia Cosimbescu, Bin Li, Vincent Sprenkle, Wei Wang,

Electrocatalysts for Energy Conversion

Abstract 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.