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首页> 外文期刊>Journal of power sources >Ether-free polymeric anion exchange materials with extremely low vanadium ion permeability and outstanding cell performance for vanadium redox flow battery (VRFB) application
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Ether-free polymeric anion exchange materials with extremely low vanadium ion permeability and outstanding cell performance for vanadium redox flow battery (VRFB) application

机译：具有极低的钒离子渗透性和出色的电池性能的无醚聚合物阴离子交换材料，适用于钒氧化还原液流电池（VRFB）应用

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摘要

Ether-free polyp-phenylene)-based anion exchange membrane materials with outstanding vanadium ion blocking properties are reported. The synthesized ionomers with a rigid backbone structure show small dimensional variations despite the high ion exchange capacities. Among the synthesized membranes, the QPPP-2 membrane with ion exchange capacity of 2.1 meq.g(-1) exhibits high anion (OH-, SO42-, and Cl-) conductivity. The QPPP-2 membrane shows an extremely low diffusion coefficient (2.12 x 10(-9) Cm-2 min(-1)) for VO2+, which is much lower than that of Nafion 115 (2.88 x 10(-6) cm(2) min(-1)), indicating the vanadium ion blocking property of QPPP-2. Moreover, the chemical and operational stabilities of the membranes are investigated via ex situ soaking tests in 0.1 M VO2+ solution and in situ operation tests for 100 cycles, respectively. The vanadium redox flow battery single cell assembled with the QPPP-2 membrane exhibits a coulombic efficiency of 99%, voltage efficiency of 87%, and energy efficiency of 86% during 100 cycles at 80 mA cm(-2). The excellent chemical, morphological, and electrochemical properties of the QPPP-2 membrane make it suitable for use in vanadium redox flow battery.
机译：报道了具有出色的钒离子阻隔性能的无醚聚对苯撑阴离子交换膜材料。尽管具有高离子交换能力，但具有刚性主链结构的合成离聚物显示出较小的尺寸变化。在合成的膜中，离子交换容量为2.1 meq.g（-1）的QPPP-2膜具有高阴离子（OH-，SO42-和Cl-）导电性。 QPPP-2膜对VO2 +的扩散系数极低（2.12 x 10（-9）Cm-2 min（-1）），远低于Nafion 115（2.88 x 10（-6）cm（ 2）min（-1）），表明QPPP-2的钒离子阻断性能。此外，分别通过在0.1 M VO2 +溶液中的异位浸泡测试和100个周期的原位操作测试来研究膜的化学和操作稳定性。组装有QPPP-2膜的钒氧化还原液流电池单节电池在80 mA cm（-2）的100个循环中表现出的库仑效率为99％，电压效率为87％，能量效率为86％。 QPPP-2膜具有优异的化学，形态和电化学性能，使其适用于钒氧化还原液流电池。

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