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Perparation of Amine-fuctionalized Sulfonated Poly(ether ether ketone) for application in iron-chromium redox flow battery

Authors： SUN Xuan, WANG Shuguang, ZHANG Rong, JIANG Xiaosong, HU Lei, YAN Xiaoming,HE Gaohong

Units： 1State Power Investment Corporation Research Institute, Beijing 102209, China; 2Dalian University of Technology, Dalian 116024, Liaoning, China

KeyWords： iron-chromium redox flow battery; ASPEEK; ion selectivity; membrane

ClassificationCode：TQ028; TM 912

year,volume(issue):pagination： 2023,43(2):17-23

Abstract：

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.

Funds：

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

AuthorIntro：

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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