膜科学与技术

低成本超薄复合膜用于不同溶液体系钒电池的性能研究

作者：赵丽娜，何虹祥，赵焕，刘建国，严川伟

单位：中国科学院金属研究所，辽宁，沈阳，110016

关键词：复合隔膜；全钒液流电池；混酸体系；低成本

出版年,卷(期):页码： 2020,40(4):92-98

摘要：

全钒液流电池是最具可行性的大规模储能技术之一。低成本高性能隔膜的开发是钒电池研发及工程化的热点和焦点。基于混酸（H2SO4+HCl）的钒溶液体系在提高电池性能与扩大运行温区方面表现出实际可行性。本文采用廉价的聚烯烃微孔膜作为支撑体，全氟磺酸离子交换树脂作为复合相，设计并制备了成本低、机械强度高、性能优异的超薄液流电池复合膜。研究了复合膜氢离子传导、钒离子渗透、电池性能在硫酸和盐酸不同体系下性能影响。结果表明：25μm复合膜具有较高的机械强度和较低的溶胀率；在混酸钒溶液体系（1.5 mol?L-1 VOSO4+1.5 mol?L-1 H2SO4+2.5mol?L-1HCl）的电池性能优异：100mA/cm2，EE80%。同时，复合膜具有较低的成本（仅为40-60元/m2），具有应用前景。

All Vanadium redox flow battery(VRFB) is one of the most feasible large-scale energy storage technologies for renewable power generation of wind and solar power. The development of low-cost and high-performance membrane is the focus of VRFB research and engineering. The mixed acid (H2SO4 + HCl) vanadium solution system has showed practical feasibility in improving battery performance and expandingoperating temperature range.The performance of the membrane in different vanadium electrolyte need to be studied to accelerate energy storageapplication of VRFB. In this paper, with commercial and cheap polyolefin microporous membrane as support and perfluorosulfonic acid ion exchange resin as composite phase, a new type of ultra-thin composite membrane for VFRB was designed and prepared.
The ion conduction, vanadium ion permeation and battery performance in different systems of sulfuric acid and hydrochloric acid were studied. The results show that the composite membrane represented high mechanical strength and low swelling rate. The battery performance of the composite membrane in the mixed solution of sulfuric acid and hydrochloric acid is excellent: 100mA / cm2, EE80%. At the same time, the composite membrane has a lower cost (only 40-50$/m2). This low cost, high performance composite membrane showed a promising prospect for VRFB application.

第一作者：赵丽娜（1982-），女，辽宁锦州人，硕士，助理研究员，研究方向新能源材料开发，E-mail:zhaolina0327@163.com。通讯作者：刘建国(1978-)，副研究员，E-mail:jgliu@imr.ac.cn。

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