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Comparison of Capacity Retention Rates During Cycling of Quinone-Bromide Flow Batteries

Published online by Cambridge University Press:  27 December 2016

Michael R. Gerhardt ,
Eugene S. Beh ,
Liuchuan Tong ,
Roy G. Gordon  and
Michael J. Aziz
Michael R. Gerhardt
Affiliation:
Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, U.S.A.
Eugene S. Beh
Affiliation:
Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, U.S.A. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, U.S.A.
Liuchuan Tong
Affiliation:
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, U.S.A.
Roy G. Gordon
Affiliation:
Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, U.S.A. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, U.S.A.
Michael J. Aziz*
Affiliation:
Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, U.S.A.
*
*(Email: maziz@harvard.edu)
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Abstract

We use cyclic charge-discharge experiments to evaluate the capacity retention rates of two quinone-bromide flow batteries (QBFBs). These aqueous QBFBs use a negative electrolyte containing either anthraquinone-2,7-disulfonic acid (AQDS) or anthraquinone-2-sulfonic acid (AQS) dissolved in sulfuric acid, and a positive electrolyte containing bromine and hydrobromic acid. We find that the AQS cell exhibits a significantly lower capacity retention rate than the AQDS cell. The observed AQS capacity fade is corroborated by NMR evidence that suggests the formation of hydroxylated products in the electrolyte in place of AQS. We further cycle the AQDS cell and observe a capacity fade rate extrapolating to 30% loss of active species after 5000 cycles. After about 180 cycles, bromine crossover leads to sufficient electrolyte imbalance to accelerate the capacity fade rate, indicating that the actual realization of long cycle life will require bromine rebalancing or a membrane less permeable than Nafion® to molecular bromine.

Keywords

energy storageorganicSustainability
Type
Articles
Information
MRS Advances , Volume 2 , Issue 8: Electrochemistry , 2017 , pp. 431 - 438
Copyright
Copyright © Materials Research Society 2016 

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References

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