| 全钒液流电池开路电压模型 |
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| 引用本文： | 陈金庆,朱顺泉,王保国,杨基础. 全钒液流电池开路电压模型[J]. 化工学报, 2009, 60(1): 211-215 |
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| 作者姓名： | 陈金庆 朱顺泉 王保国 杨基础 |
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| 作者单位： | 清华大学化学工程系,北京,100084;清华大学化学工程系,北京,100084;清华大学化学工程系,北京,100084;清华大学化学工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金项目(20676068);;国家高技术研究发展计划项目(2007AA05Z245)~~ |
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| 摘 要： | 建立全钒液流电池六参数开路电压计算模型，揭示开路电压由电池总电势和VO2+/VO2+电极电势决定，并与电解液中钒离子透膜扩散行为密切相关。模型计算得到开路电压存在两个电压平台和一个转折点，与实验结果较为一致。利用该模型计算了电池开路时电解液中4种钒离子浓度随时间的变化关系，指出电池电解液不均衡性是由不同价态钒离子在膜相的Donnan平衡和透膜扩散系数不同产生的。该模型可为优化电池操作提供理论指导，并可为电池长期运行时电解液管理提供工程指导。
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| 关 键 词： | 全钒液流电池 开路电压 理论模型 电解液不均衡性 |
| 收稿时间： | 2008-05-12 |
| 修稿时间： | 2008-10-13 |
Model of open-circuit voltage for all-vanadium redox flow battery |
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| CHEN Jinqing,ZHU Shunquan,WANG Baoguo,YANG Jichu. Model of open-circuit voltage for all-vanadium redox flow battery[J]. Journal of Chemical Industry and Engineering(China), 2009, 60(1): 211-215 |
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| Authors: | CHEN Jinqing ZHU Shunquan WANG Baoguo YANG Jichu |
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| Affiliation: | Department of Chemical Engineering;Tsinghua University;Beijing 100084;China |
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| Abstract: | A six-parameter model of the open-circuit voltage (OCV) for all-vanadium redox flow battery (VRB) was proposed.This model indicated that OCV was associated with the electromotive force of the cell, VO2+/VO2+ electrode potential, and the transport behavior of vanadium ions in electrolyte across the membrane.Two plateaus and a turning point were obtained in OCV curve by this model, indicating that the calculated results were in good agreement with the experimental data.The dependence of concentrations of four kinds of vanadium ions on time was also investigated.The result showed that the electrolyte imbalance was caused by the differences of Donnan balance and diffusion coefficients of different vanadium ions across the membrane.This model can provide theoretical fundamentals for operation process and engineering guidance for electrolyte management of VRB. |
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| Keywords: | all-vanadium redox flow battery (VRB) open-circuit voltage (OCV) theoretical model electrolyte imbalance |
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