Ionic liquid-mediated aqueous redox flow batteries for high voltage applications

Aqueous redox flow batteries with high cell voltages represent a promising approach for low-cost, high safety and high energy density applications. However, water breakdown is a major concern because it limits cell voltage. For the first time, we report the use of a highly concentrated aqueous ionic...

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Bibliographic Details
Published in:Electrochemistry communications 2016-09, Vol.70, p.56-59
Main Authors: Chen, Ruiyong, Hempelmann, Rolf
Format: Article
Language:English
Subjects:
1-Butyl-3-methylimidazolium chloride
Aqueous electrolyte
Electrochemical window
Ionic liquid
Redox flow batteries
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Summary:Aqueous redox flow batteries with high cell voltages represent a promising approach for low-cost, high safety and high energy density applications. However, water breakdown is a major concern because it limits cell voltage. For the first time, we report the use of a highly concentrated aqueous ionic liquid electrolyte, 1-butyl-3-methylimidazolium chloride (BMImCl)-H2O, in an aqueous flow battery operating with a broad electrochemical stability window of 3V. The proof-of-concept was demonstrated using 2V redox couples of metal acetylacetonates and a hybrid Zn/Ce flow battery. •An aqueous electrolyte with an electrochemical stability window of 3V has been achieved.•2V couples of metal acetylacetonates have been tested in 10m 1-butyl-3-methylimidazolium chloride aqueous electrolytes.•Reversible Zn2+/Zn and Ce4+/Ce3+ redox reactions have been demonstrated in a flow battery with a 2V cell voltage.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2016.07.003