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Asymmetric vanadium flow batteries: long lifespan via anolyte overhang strategy

Abstract

Fast capacity decay is a serious problem in vanadium flow batteries (VFBs). How to eliminate or slow down the capacity fading has become a critical issue for the practical application of VFB. Herein, the concept of asymmetric vanadium flow battery (aVFB) is introduced, in which the asymmetric design of catholyte and anolyte is used to suppress the capacity decay of the VFB. Based on the comprehensive analyzation of the capacity decay and electrolyte imbalance process of the traditional symmetric VFB, it is found that the capacity fading is mainly owing to the loss of 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 this novel anolyte overhang aVFBs, long-term cycle performance of the corresponding symmetric overhang VFBs and catholyte overhang aVFBs are investigated for comparison. The optimal excess ratio of anolyte and how to adding the excess anolyte are also suggested for future study.

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Publication details

The article was 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, Accepted Manuscript
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    Asymmetric vanadium flow batteries: long lifespan via anolyte overhang strategy

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

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