膜科学与技术

同轴电纺纤维质子交换膜及全钒液流电池性能

作者：张奇a，张代双a，逄博a，吴雪梅a，贺高红ab，崔福军b

单位： a大连理工大学精细化工国家重点实验室，膜科学与技术研究中心，化工学院，大连 116024；b大连理工大学盘锦产业技术研究院，盘锦，124221

关键词：质子交换膜；全钒液流电池；同轴静电纺丝；能量效率

出版年,卷(期):页码： 2020,40(6):104-110

摘要：

质子交换膜是全钒液流电池的重要组件，应具备高质子传导和阻隔钒离子渗透的能力。但质子交换膜普遍存在质子传导率与溶胀度不易兼得，成为其面临的巨大挑战。本文提出膜材料的同轴电纺纤维化方法，在膜中构建长程质子传导通道，同时提高膜的耐溶胀性。磺化聚醚醚酮（SPEEK）同轴纤维膜兼具高质子传导和低溶胀特性，内、外轴采用相同磺化度的同轴纤维膜性能明显优于单轴纤维膜，溶胀度降低了41.3%，钒渗透率降低了6.9%，质子传导率提高了13.9%，质子/钒离子选择性提高了22.5%。在液流电池性能测试中，100mA/cm2电流密度下，同轴电纺纤维膜电池的能量效率达到83.7%，高于单轴电纺纤维膜和商业化Nafion211膜（74.9%），表明同轴电纺方法在全钒液流电池中应用前景广阔。

Proton exchange membrane is an important component of all-vanadium redox flow batteries, which should have high proton conductivity and the ability to block the penetration of vanadium ions. However, it is challenging for membrane to obtain high proton conductivity and low swelling ratio. In this work, the coaxial electrospinning method is proposed. By fiberizing the membrane materials, interconnective proton pathways could be built in the membranes to improve anti-swelling ability. The properties of the sulfonated poly (ether ether ketone) coaxial electrospun membrane is much better than that of the uniaxial electrospun membrane, with the same degree of sulfonation material. Coaxial electrospun membranes have a 41.3% reduction in swelling ratio, a 6.9% reduction in vanadium permeability, an 13.9% increase in conductivity and a 22.5% increase in proton/vanadium ions selectivity. In the single cell performance test, at a current density of 100mA/cm2, the energy efficiency of the cell assembled with coaxial electrospun membrane reaches 83.7%, which is higher than that assembled with the uniaxial electrospun membrane and Nafion211. Coaxial electrospinning method has potential applications in all-vanadium redox flow batteries.

张奇(1995-)，男，黑龙江省大庆人，研究方向为离子交换膜及液流电池，Email：zh6915253@126.com

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