Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode
Experimental study on the performance of a vanadium redox flow battery with non-uniformly compressed carbon felt electrode
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非均匀压缩碳毡电极全钒氧化还原液流电池性能实验研究
DOI：
10.1016/j.apenergy.2018.01.047
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发表时间：
2018-03
期刊：
影响因子：
11.2
通讯作者：
Yang W W
中科院分区：
文献类型：
--
作者：
Wang Q;Qu Z G;Jiang Z Y;Yang W W
优化电极压缩可以有效降低电极接触电阻，促进物质传质，从而提高全钒液流电池的性能。研究了在集流体上具有蛇形流场和压缩薄电极的VRFB的新设计，以提高其功率密度。在这项研究中，侵入比，孔隙率，应变应力，面积比电阻，流体动力学特性，和充电/放电性能的VRFBs的综合特征下，不同的压缩比（CR），可以通过改变组装力进行调整。然后，通过实验测试了不同CR的碳毡VRFB，定量评价了电极压缩对VRFB电池性能的影响。在VRFB中，碳毡电极在流场作用下的不均匀压缩导致通道、侵入区和肋区下的电极孔隙率分布不均匀。得到了不同孔隙度下的侵入比、局部平均孔隙度和渗透率。通过测量流经电极的流动压降，修正了碳纤维毡的Kozney-Carman常数。得到了不同CR下的充放电曲线，并计算了相应的能量效率。结果表明，充放电时间随CR的增加而增加，当CR在0.3%~ 41.8%范围内变化时，能量效率最高可达19.4%。
Optimal electrode compression can efficiently reduce electrode contact resistance and enhance species mass transfer so that the performance of vanadium redox flow battery (VRFB) is consequently improved. New designs of VRFB with a serpentine flow field on the current collector and compressed thin electrodes are investigated to increase its power density. In this study, the intrusion ratio, porosity, strain–stress, area specific resistance, hydrodynamic characteristics, and charge/discharge performance of VRFBs are comprehensively characterized under different compression ratios (CRs) which can be adjusted by changing the assembly force. Then, VRFBs using carbon felts with different CRs are tested by experiments, and the influence of electrode compression on VRFB cell performance is quantitatively evaluated. The in-homogeneous compression of carbon felt electrode in a VRFB with a flow field leads to a non-uniform porosity distribution of the electrodes under the channel, intrusion, and rib regions. The intrusion ratio, local average porosity, and permeability at different CRs are obtained. The Kozney–Carman constant of carbon fiber felt is modified by measuring the flow pressure drop through the electrode. The charge/discharge curves are acquired and the corresponding energy efficiencies are calculated under different CRs. It is shown that the charge/discharge time increases with the CR, and the energy efficiency can be improved to a maximum of 19.4% when the CR varies from 0.3% to 41.8%.
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影响因子：
9.2
作者：
Zhongbao Wei;K. Tseng;N. Wai;T. Lim;M. Skyllas-Kazacos
通讯作者：
Zhongbao Wei;K. Tseng;N. Wai;T. Lim;M. Skyllas-Kazacos
影响因子：
6.6
作者：
A. Shah;M. J. Watt-Smith;F. Walsh
通讯作者：
A. Shah;M. J. Watt-Smith;F. Walsh
DOI：
10.1016/j.egypro.2014.12.440
发表时间：
2014
期刊：
Energy Procedia
影响因子：
--
作者：
Simon Müller;Philipp G. Sandner;I. Welpe
通讯作者：
Simon Müller;Philipp G. Sandner;I. Welpe
影响因子：
6.6
作者：
G. Qiu;A. Joshi;C. Dennison;K. Knehr;E. C. Kumbur;Ying Sun
通讯作者：
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影响因子：
11.2
作者：
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通讯作者：
Di Blasi, A.