全钒液流电池用聚氯乙烯&聚乙烯吡咯烷酮复合质子交换膜的制备与性能研究  

Preparation and properties of polyvinylpyrrolidone&polyvinyl chloride composite proton exchange membrane for vanadium redox flow batteries

作　　者：代宇 曾泽华 张东彬 滕艾均 刘天豪 尹翔鹭 袁欣然 Dai Yu;Zeng Zehua;Zhang Dongbin;Teng Aijun;Liu Tianhao;Yin Xianglu;Yuan Xinran(Ansteel Group Beijing Research Institute Co.,Ltd.,Beijing 102211,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102211

出　　处：《钢铁钒钛》2024年第4期1-7,共7页Iron Steel Vanadium Titanium

基　　金：国家重点研发课题“钒铬中间体可控还原短程制备高附加值产品技术”(2022YFC3901004);城市消防项目“天津市应用基础研究多元投入”(22JCQNJCO1750)。

摘　　要：质子交换膜(PEM)作为全钒氧化还原液流电池(VRFB)的关键组成部分,在控制VRFB的性能以及成本方面起着重要的作用。制备了一系列不同比例的聚乙烯吡咯烷酮(PVP)&聚氯乙烯(PVC)复合质子交换膜,其中PVP由于胺基的质子化作用,在膜中进行离子传导,而PVC作为骨架起到支撑作用。通过调整复合膜中PVP和PVC的比例,得到性能适用于全钒液流电池的质子交换膜。研究发现,PVP&PVC复合膜中PVC含量增加,膜的机械性能增强,钒离子透过率降低;而膜中PVP含量增加,膜的电导率和溶胀随之变大。测试结果表明,当复合膜中PVP和PVC质量比为1:1时,混合膜的质子选择性最高为3.8×10^(3) S·min·cm^(-3),复合膜综合性能最好,并且在电流密度为50 mA·cm^(-2)时,该单电池具有较高的充放电容量。Proton exchange membrane(PEM),as a key component of vanadium redox flow battery(VRFB),plays an important role in controlling the performance and cost of VRFB.A series of PVP&PVC composite PEMs were prepared,wherein PVP carried out ion conduction in the membrane due to the protonation of amine groups,and PVC acted as skeleton to support the membrane.By adjusting the ratio of PVP and PVC in the composite membrane,the PEM which is suitable for all-vanadium flow battery was obtained.It is found out that with the increase of PVC content in the composite PEM,the mechanical property of the membrane is enhanced,and the transmittance of vanadium ion is decreased.The conductivity and swelling of the membrane increased with the increase of PVP content.The results show that when the mass ratio of PVP and PVC in the composite membrane is 1:1,the proton selectivity is 3.8×10^(3) S·min·cm^(–3)which is the highest among the investigated composite membranes,so the comprehensive performance of PVP&PVC-1:1 composite membrane is the best.When the current density is 50 mA·cm^(–2),the single battery assembled with PVP&PVC-1:1 membrane is possessed a good charge and discharge capacity.

关 键 词：全钒液流电池 质子交换膜 聚乙烯吡咯烷酮 聚氯乙烯 质子选择性 

分 类 号：TF841.3[冶金工程—有色金属冶金] TM911[电气工程—电力电子与电力传动]