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Issue 43, 2017
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Asymmetric vanadium flow batteries: long lifespan via an anolyte overhang strategy

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Abstract

Fast capacity decay is a serious problem in vanadium flow batteries (VFBs). How to eliminate or slow down capacity fading has become a critical issue for the practical application of VFBs. Herein, the concept of an asymmetric vanadium flow battery (aVFB) is introduced, in which the asymmetric design of a catholyte and an anolyte is used to suppress the capacity decay of the VFB. Based on the comprehensive analysis of the capacity decay and electrolyte imbalance process of the traditional symmetric VFB, it was found that the capacity fading is mainly owing to the loss of the anolyte in the long-term cycling test. Therefore, this work attempts to use excess anolyte (i.e. 10%, 20% and 30%) to mitigate the capacity decay during the long-term operation of the VFB. To gain deeper insights into the capacity retention mechanism of these novel anolyte overhang aVFBs, long-term cycle performance of the corresponding symmetric overhang VFBs and catholyte overhang aVFBs is investigated for comparison. The optimal excess ratio of anolyte and how to add the excess anolyte are also suggested for future study.

Graphical abstract: Asymmetric vanadium flow batteries: long lifespan via an anolyte overhang strategy

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Publication details

The article was received on 13 Sep 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP06249D
Citation: Phys. Chem. Chem. Phys., 2017,19, 29195-29203
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    Asymmetric vanadium flow batteries: long lifespan via an anolyte overhang strategy

    D. Mu, Y. Zhao, L. Yu, L. Liu and J. Xi, Phys. Chem. Chem. Phys., 2017, 19, 29195
    DOI: 10.1039/C7CP06249D

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