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Title: Extending the Lifetime of Organic Flow Batteries via Redox State Management

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b13295· OSTI ID:1511677

Redox flow batteries based on quinone-bearing aqueous electrolytes have emerged as promising systems for energy storage from intermittent renewable sources. The lifetime of these batteries is limited by quinone stability. In this work, we confirm that 2,6-dihydroxyanthrahydroquinone tends to form an anthrone intermediate that is vulnerable to subsequent irreversible dimerization. We show quantitatively that this decomposition pathway is responsible for the loss of battery capacity. Computational studies indicate that the driving force for anthrone formation is greater for anthraquinones with lower reduction potentials. We demonstrate that the decomposition can be substantially mitigated. We propose that conditions minimizing anthrone formation and avoiding anthrone dimerization slow the capacity loss rate by over an order of magnitude. We anticipate that this mitigation strategy readily extends to other anthraquinone- based flow batteries and is thus an important step toward realizing renewable electricity storage through long-lived organic flow batteries.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1511677
Journal Information:
Journal of the American Chemical Society, Vol. 141, Issue 20; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 106 works
Citation information provided by
Web of Science

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