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Coaxial electrospun proton exchange membrane and all-vanadium flow battery performance

Authors： ZHANG Qia, ZHANG Daishuanga, PANG Boa, WU Xuemeia*, HE Gaohonga,b, CUI Fujunb*

Units： aState Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China; bPanjin Industrial Technology Institute, Dalian University of Technology, Panjin, 124221, China

KeyWords： Proton exchange membrane; all-vanadium redox flow batteries; coaxial electrospinning; energy efficiency

ClassificationCode：TM912.1

year,volume(issue):pagination： 2020,40(6):104-110

Abstract：

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.

Funds：

国家自然科学基金（21776034）；国家自然科学基金联合基金（U1663223, U1808209）；国家重点研究发展计划项目(2016YFB0101203)；辽宁省教育厅(LT2015007);科技部重点领域创新团队（2016RA4053）；教育部长江学者奖励计划项目（T2012049）；大连理工大学重大项目培育科研专题项目（DUT16TD19）

AuthorIntro：

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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