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Numerical study of the effects of carbon felt electrode compression in all-vanadium redox flow batteries

机译：全钒氧化还原液流电池中碳毡电极压缩效果的数值研究

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摘要

The porous carbon felt electrode is one of the major components of all-vanadium redox flow batteries (VRFBs). These electrodes are necessarily compressed during stack assembly to prevent liquid electrolyte leakage and diminish the interfacial contact resistance among VRFB stack components. The porous structure and properties of carbon felt electrodes have a considerable influence on the electrochemical reactions, transport features, and cell performance. Thus, a numerical study was performed herein to investigate the effects of electrode compression on the charge and discharge behavior of VRFBs. A three-dimensional, transient VRFB model developed in a previous study was employed to simulate VRFBs under two degrees of electrode compression (10% vs. 20%). The effects of electrode compression were precisely evaluated by analysis of the solid/electrolyte potential profiles, transfer current density, and vanadium concentration distributions, as well as the overall charge and discharge performance. The model predictions highlight the beneficial impact of electrode compression; the electronic conductivity of the carbon felt electrode is the main parameter improved by electrode compression, leading to reduction in ohmic loss through the electrodes. In contrast, the kinetics of the redox reactions and transport of vanadium species are not significantly altered by the degree of electrode compression (10% to 20%).
机译：多孔碳毡电极是全钒氧化还原液流电池（VRFB）的主要组件之一。这些电极必须在电池组组装期间被压缩，以防止液体电解质泄漏并减小VRFB电池组组件之间的界面接触电阻。碳毡电极的多孔结构和性能对电化学反应，传输特性和电池性能有很大影响。因此，本文进行了数值研究以研究电极压缩对VRFBs的充电和放电行为的影响。先前研究中开发的三维瞬态VRFB模型用于模拟两度电极压缩（10％对20％）下的VRFB。通过分析固体/电解质电势曲线，转移电流密度和钒浓度分布以及总体充电和放电性能，可以精确评估电极压缩的效果。模型预测突出了电极压缩的有益影响。碳毡电极的电导率是通过电极压缩而改善的主要参数，从而降低了通过电极的欧姆损耗。相反，氧化还原反应的动力学和钒物质的传输不会因电极压缩程度（10％至20％）而显着改变。

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