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Transport phenomena associated with capacity loss of all-vanadium redox flow battery

机译：与全钒氧化还原流电池的容量损失相关的运输现象

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摘要

This study investigates transport of different species through the Nafion® 115 membrane in an all vanadium redox flow battery to understand transport phenomena associate with capacity loss. We consider several driving forces related to transport of vanadium ions, proton, and water molecules and examine the variations in ion concentration during charge-discharge, and long-term operation. First, variations in ion concentration are analyzed during the 3rd and the 300th charge-discharge cycles to compare the ion transport process at between early stage and late stage. The capacity loss is closely related to the self-discharge reaction caused by diffusion through the membrane, and proton transport is another important factor of capacity loss since the imbalance in proton concentration can accelerate water transport through the membrane. Furthermore, variations in solution volume and ion concentration are examined during long-term charge-discharge cycles. Since ions accumulate on the positive electrode due to self-discharge reaction and repeated electrochemical reaction, water molecules transport to the positive electrode side. Finally, the relationship between the changes in solution volume and capacity loss is examined, and an empirical equation is suggested for the prediction of capacity loss from changes in the solution volume during long-term operation. Through the results, we can predict the lifetime of VFB system by simple measurement.
机译：本研究通过Nafion®115膜在所有钒氧化还原流电池中调查不同种类的运输，以了解运输现象与容量损失相关联。我们考虑与钒离子，质子和水分子的运输有关的几种驱动力，并在充电 - 放电期间检查离子浓度的变化，以及长期操作。首先，在第3阶段和第300次充电放电循环期间分析离子浓度的变化，以比较早期和晚期之间的离子传输过程。容量损失与通过膜扩散引起的自放电反应密切相关，而质子传输是由于质子浓度的不平衡可以加速通过膜的不平衡，因此质子传输是容量损失的另一个重要因素。此外，在长期电荷 - 放电循环期间检查溶液体积和离子浓度的变化。由于离子由于自放电反应和重复的电化学反应而在正电极上积聚，因此水分子输送到正极侧。最后，检查了解决方案体积和容量损耗之间的变化之间的关系，并建议经验方程来预测在长期运行期间从解决方案体积的变化的容量损失预测。通过结果，我们可以通过简单测量来预测VFB系统的寿命。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第2期|119040.1-119040.11|共11页
  • 作者

    Dong Kyu Kim; Sang Jun Yoon; Sangwon Kim;

  • 作者单位

    School of Mechanical Engineering Chung-Ang University Seoul 06974 Korea;

    Center for membranes Korea Research Institute of Chemical Technology Daejeon 34114 Korea Transfercenter Sustainable Electrochemistry Saarland University Saarbruecken 66125 Germany;

    KIST Europe Korea Institute of Science and Technology Campus E71 Saarbruecken 66123 Germany Transfercenter Sustainable Electrochemistry Saarland University Saarbruecken 66125 Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    All-vanadium flow battery; Capacity loss; Species transport; Osmosis; Prediction of state of charge;

    机译：全钒流量电池;容量损失;物种运输;渗透;预测充电状态;

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