A novel porous membrane based on pyridinium-functionalized poly(phthalazinone ether ketone) with pendant phenyl groups (PyPPEK-P) is synthesized from poly(phthalazinone ether ketone) with benzyl chloride moieties by the vapor induced phase separation (VIPS) process. The membrane is used for vanadium redox flow batteries (VRFB). Pyridine is used as an amination reagent to improve the chemical stability of the membrane, and its successful introduction is experimentally confirmed. The structure and properties of the porous membrane are adjusted by VIPS to enhance the membrane performance when used in batteries. It is found that a lower temperature and a longer exposure time are beneficial to obtaining a large pore size in cross-section, while relative humidity exert a complex effect on the membrane structure. The PyPPEK-P membrane prepared by mixed NMP and DMAc solvents as casting solution exhibit the best battery performance. Compared with Nafion 115, the PyPPEK-P membrane display higher coulombic efficiency (97.2% vs. 96.8%), voltage efficiency (83.1% vs. 76.9%), and energy efficiency (81.0% vs. 76.8%) at a 140 mA cm^-2 current density. After 1000 charge-discharge cycles, the PyPPEK-P membrane exhibit a low capacity-decay, while the battery performance do not decline. These observations indicate that PyPPEK-P porous membranes have good application prospects in VRFB.

一种基于具有侧苯基的吡啶鎓官能化聚（酞嗪酮醚酮）（PyPPEK-P）的新型多孔膜是由具有苄基氯部分的聚（酞嗪酮醚酮）通过气相诱导相分离（VIPS）工艺合成的。该膜用于钒氧化还原液流电池（VRFB）。吡啶用作胺化试剂以提高膜的化学稳定性，其成功引入已得到实验证实。多孔膜的结构和性能通过 VIPS 进行调整，以提高用于电池时的膜性能。研究发现，较低的温度和较长的暴露时间有利于获得较大的横截面孔径，而相对湿度对膜结构的影响较为复杂。混合 NMP 和 DMAc 溶剂作为浇铸液制备的 PyPPEK-P 膜表现出最佳的电池性能。与 Nafion 115 相比，PyPPEK-P 膜在 140 mA cm 时表现出更高的库仑效率（97.2% vs. 96.8%）、电压效率（83.1% vs. 76.9%）和能量效率（81.0% vs. 76.8%）^-2电流密度。经过 1000 次充放电循环后，PyPPEK-P 膜表现出较低的容量衰减，而电池性能并未下降。这些观察表明PyPPEK-P多孔膜在VRFB中具有良好的应用前景。