A Highly Soluble Organic Catholyte for Non‐Aqueous Redox Flow Batteries

Publisher: John Wiley & Sons Inc

E-ISSN: 2194-4296|3|5|476-480

ISSN: 2194-4288

Source: ENERGY TECHNOLOGY (ELECTRONIC), Vol.3, Iss.5, 2015-05, pp. : 476-480

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Abstract

AbstractA phenothiazine derivative with high solubility in carbonate solvents containing lithium salts showed extensive overcharge protection and, as a result, has been evaluated as a catholyte for non‐aqueous redox flow batteries. We report the testing of 3,7‐bis(trifluoromethyl)‐N‐ethylphenothiazine as a catholyte and 2,3,6‐trimethylquinoxaline as the anolyte in redox flow batteries containing 0.05, 0.15, and 0.35 M active material and found the longest capacity retention over about 60 cycles at 0.15 M. To our knowledge, this is the most soluble catholyte candidate with a robust radical cation.