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Optimization of local porosity in the electrode as an advanced channel for all-vanadium redox flow battery

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  • Yoon, Sang Jun
  • Kim, Sangwon
  • Kim, Dong Kyu

Abstract

Experimental and numerical studies have been carried out to improve the flow distribution by optimizing the local porosity of the electrodes of the all-vanadium redox flow batteries (VFBs) to increase the energy efficiency at high current density. We control the local porosity by inserting extra layer of electrode at inlet and outlet, and the flow field of electrolyte is analyzed numerically. First, the flow field of electrolyte is analyzed numerically to understand distribution of electrolyte in the electrode. Then, the charge and discharge curve is analyzed to understand the effect of local porosity of electrode on the energy efficiency. At 50 mA/cm2, the energy efficiency is the highest when using electrode with uniform porosity. At 150 mA/cm2, however, the energy efficiency of the cell using the electrode with low porosity at inlet is similar to that using the uniform electrode which is 66.6%. Lastly, we suggest an empirical equation for optimal local porosity distribution of the electrode according to current density. Using the empirical equation, we can increase the energy efficiency of the cell to 67.7% at 150 mA/cm2. This study shows the possibility of increase of the energy efficiency of VFBs by controlling local porosity of the electrode.

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  • Yoon, Sang Jun & Kim, Sangwon & Kim, Dong Kyu, 2019. "Optimization of local porosity in the electrode as an advanced channel for all-vanadium redox flow battery," Energy, Elsevier, vol. 172(C), pages 26-35.
    • Handle: RePEc:eee:energy:v:172:y:2019:i:c:p:26-35
    DOI: 10.1016/j.energy.2019.01.101
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    References listed on IDEAS

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    1. Chen, Wei & Kang, Jialun & Shu, Qing & Zhang, Yunsong, 2019. "Analysis of storage capacity and energy conversion on the performance of gradient and double-layered porous electrode in all-vanadium redox flow batteries," Energy, Elsevier, vol. 180(C), pages 341-355.
    2. Heidarian, Alireza & Cheung, Sherman C.P. & Ojha, Ruchika & Rosengarten, Gary, 2022. "Effects of current collector shape and configuration on charge percolation and electric conductivity of slurry electrodes for electrochemical systems," Energy, Elsevier, vol. 239(PD).

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