Crosslinked anion exchange membranes with primary diamine-based crosslinkers for vanadium redox flow battery application

Min Suc Cha, Hwan Yeop Jeong, Hee Young Shin, Soo Hyun Hong, Tae Ho Kim, Seong Geun Oh, Jang Yong Lee, Young Taik Hong

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

A series of polysulfone-based crosslinked anion exchange membranes (AEMs) with primary diamine-based crosslinkers has been prepared via simple a crosslinking process as low-cost and durable membranes for vanadium redox flow batteries (VRFBs). Chloromethylated polysulfone is used as a precursor polymer for crosslinked AEMs (CAPSU-x) with different degrees of crosslinking. Among the developed AEMs, CAPSU-2.5 shows outstanding dimensional stability and anion (Cl, SO42−, and OH) conductivity. Moreover, CAPSU-2.5 exhibits much lower vanadium ion permeability (2.72 × 10−8 cm2 min−1) than Nafion 115 (2.88 × 10−6 cm2 min−1), which results in an excellent coulombic efficiency of 100%. The chemical and operational stabilities of the membranes have been investigated via ex situ soaking tests in 0.1 M VO2+ solution and in situ operation tests for 100 cycles, respectively. The excellent chemical, physical, and electrochemical properties of the CAPSU-2.5 membrane make it suitable for use in VRFBs.

Original languageEnglish
Pages (from-to)78-86
Number of pages9
JournalJournal of Power Sources
Volume363
DOIs
StatePublished - 2017 Jan 1

Keywords

  • Anion exchange membrane
  • Primary amine crosslinker
  • Redox flow battery
  • Vanadium
  • poly(sulfone)s

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