Poly(terphenylene) anion exchange membranes with high conductivity and low vanadium permeability for vanadium redox flow batteries (VRFBs)
Poly(terphenylene) anion exchange membranes with high conductivity and low vanadium permeability for vanadium redox flow batteries (VRFBs)
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DOI：
10.1016/j.memsci.2019.117665
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发表时间：
2020-03-15
影响因子：
9.5
通讯作者：
Kim, Sangil
中科院分区：
文献类型：
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作者：
Wang, Tongshuai;Jeon, Jong Yeob;Kim, Sangil
在这项研究中，我们展示了一类新的聚（三联苯）为基础的阴离子交换膜（AEMs）具有改善的化学稳定性和阴离子导电性的钒氧化还原液流电池（VRFBs）。合成了一系列具有侧链季铵烷基的三联苯和联苯基聚合物，并对其进行了表征。当聚合物主链和阳离子束缚的烷基链的排列变化时，所制备的AEM膜在保持高电导率的同时表现出极低的钒渗透率。这些性质进一步提供了在所有电流密度下接近100%的高库仑效率以及高电压效率。使用基于聚（三联苯）的AEM的单电池VRFB性能显示出比商业AEM的库仑效率高2-5%，并且与商业PEM（212）的电压效率相似。在20 mA/cm（2）的电流密度下实现了93.64%的最高EE值（与Nafion 212的72% EE相比）。此外，基于聚（三联苯）的AEM显示出上级循环稳定性和高容量保持率，从而证明了它们作为用于VRFB应用的有前景的IEM的高性能。
In this study, we demonstrate a new class of poly(terphenylene) based anion exchange membranes (AEMs) with improved chemical stability and anion conductivity in vanadium redox flow batteries (VRFBs). A series of terphenyl- and biphenyl-based polymers with pendant quaternary ammonium alkyl groups were synthesized and characterized for VRFB applications. When the arrangement of the polymer backbone and cation-tethered alkyl chains was varied, the prepared AEM membranes exhibited extremely low vanadium permeance while maintaining high conductivity. These properties further provided a high coulombic efficiency close to 100% at all current densities as well as high voltage efficiency. The single cell VRFB performance with the poly(terphenylene) based AEMs showed 2-5% higher coulombic efficiency than those of commercial AEMs and similar voltage efficiency to those of commercial PEMs (Nafion (R) 212). The highest EE value of 93.64% was achieved at the current density of 20 mA/cm(2) (vs. 72% EE for Nafion212). In addition, poly(terphenylene) based AEMs showed superior cycle stability and high capacity retention, thus demonstrating their high performance as promising IEMs for VRFB application.