Zhang Bengui, Fu Yanshi, Liu Qian, Li Lu, Zhang Xueting, Yang Zhirong, Zhang Enlei, Wang Kangjun, Wang Guosheng, Zhang Zhigang, Zhang Shouhai
College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China.
ACS Appl Mater Interfaces. 2022 Nov 16;14(45):50858-50869. doi: 10.1021/acsami.2c14107. Epub 2022 Nov 4.
A vanadium flow battery (VFB) is one of the most promising electrochemical energy storage technologies. However, membranes for VFBs still suffer from high cost or low conductivity and poor stability. Here, we report new quaternized anthrone-containing poly(aryl ether ketone) (QAnPEK) membranes for VFBs. QAnPEK membranes with moderate ion exchange capacity (1.26 mmol g) were swelling-induced in HPO (50 wt %) to form wider ion transport pathways that significantly enhanced membrane conductivity (e.g., 0.49 Ω cm for the QAnPEK-virgin membrane and 0.12 Ω cm for the swelling-induced QAnPEK-90 membrane). The bulky rigid anthrone-containing backbone provided high swelling resistance and enabled QAnPEK membranes to have high ion selectivity. As a result, QAnPEK membranes displayed low area resistance, high ion selectivity, and robust mechanical strength. The QAnPEK-90 membrane yielded excellent energy efficiencies (92.4% at 80 mA cm, 85.1% at 200 mA cm, and 80.3% at 280 mA cm). Moreover, QAnPEK membranes exhibited outstanding in situ and ex situ stability, for example, the VFB with the QAnPEK-40 membrane demonstrated highly stable battery performance for 3000 cycles at 160 mA cm. QAnPEK membranes are attractive candidates for VFB application.
钒液流电池（VFB）是最具前景的电化学储能技术之一。然而，用于钒液流电池的膜仍然存在成本高、电导率低和稳定性差的问题。在此，我们报道了用于钒液流电池的新型含季铵化蒽酮的聚芳醚酮（QAnPEK）膜。具有中等离子交换容量（1.26 mmol g）的QAnPEK膜在HPO（50 wt%）中发生溶胀诱导，形成更宽的离子传输通道，显著提高了膜的电导率（例如，QAnPEK原始膜为0.49 Ω cm，溶胀诱导的QAnPEK - 90膜为0.12 Ω cm）。含庞大刚性蒽酮的主链提供了高抗溶胀性，使QAnPEK膜具有高离子选择性。结果，QAnPEK膜表现出低面积电阻、高离子选择性和强大的机械强度。QAnPEK - 90膜产生了优异的能量效率（80 mA cm时为92.4%，200 mA cm时为85.1%，280 mA cm时为80.3%）。此外，QAnPEK膜表现出出色的原位和异位稳定性，例如，配备QAnPEK - 40膜的钒液流电池在160 mA cm下展示了3000次循环的高度稳定的电池性能。QAnPEK膜是钒液流电池应用的有吸引力的候选材料。
