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两性聚醚醚酮离子交换膜制备及应用

作者：孙璇，王曙光，张蓉，江小松，胡磊，焉晓明，贺高红

单位： 1国家电投集团科学技术研究院有限公司，北京102209;2大连理工大学，辽宁大连 116024

关键词：铁铬液流电池；两性聚醚醚酮；离子选择性；膜

DOI号：

分类号： TQ028; TM 912

出版年,卷(期):页码： 2023,43(2):17-23

摘要：

本文对铁铬液流电池用的离子交换膜进行分子设计，以磺化聚醚醚酮（SPEEK）为基质，通过反应引入叔胺基团，制备了两性聚醚醚酮（ASPEEK）。两性结构促进了膜中高效氢键网络的构建，从而可以形成较大的亲水离子团簇。同时，叔胺基团与磺酸基团之间形成酸碱对效应，有效抑制了膜的吸水溶胀并改善了膜的微相分离结构缩小了离子通道大小。另外，叔胺在酸性环境下质子化之后带有的正电荷可排斥铁铬离子，进而实现了铁铬液流电池库伦效率与能量效率的有效提升。在70 mA/cm2电流密度下铁铬电池性能测试中，ASPEEK膜的库伦效率为96.9%，能量效率达到80.57%。

By introducing tertiary amine groups into sulfonated polyether ether ketone (SPEEK), amphoteric polyether ether ketone (ASPEEK) were successfully synthesized recently and first investigated as proton exchange membranes for iron-chromium redox flow batteries. Amphoteric structure promotes the construction of high-efficient hydrogen bond network in the membrane, which can form large hydrophilic ion clusters. At the same time, the acid-base pair effect is formed between the tertiary amine group and the sulfonic acid group, which effectively inhibits the water absorption and swelling of the membrane, improves the microphase separation structure of the membrane and reduces the size of the ion channel. In addition, the positive charge of tertiary amine after protonation in acidic environment can repel iron/chromium ions, thus effectively improving the coulomb efficiency and energy efficiency of iron-chromium redox flow battery. ASPEEK membranes exhibit a coulomb efficiency(CE) of 96.9% and the energy efficiency(EE) of 80.57% in iron-chromium redox flow battery at 70 MA / cm2 current density.

基金项目：

北京市科技计划项目（Z191100004619008， Z201100004520021）

作者简介：

孙璇（1989.11）籍贯黑龙江省肇州县，主要研究方向为储能技术

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