Journal
JOURNAL OF POWER SOURCES
Volume 242, Issue -, Pages 575-580Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.05.102
Keywords
Amphiphilic block copolymer; Proton exchange membrane; Vanadium redox flow battery; Energy storage
Funding
- DOE [DE-SC0004382]
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An amphiphilic block copolymer comprised of hydrophobic polyaryletherketone (PAEK) and hydrophilic sulfonated polyaryletherketone (SPAEK) blocks has been synthesized and characterized. A membrane prepared from the block copolymer is used as the separator in a single cell vanadium redox flow battery (VRB). The proton conductivity, mechanical property, VO2+ permeability and single VRB cell performance of this block copolymer membrane are investigated and compared to Nafion (TM) 117. The block copolymer membrane showed significantly improved vanadium ion selectivity, higher mechanical strength and lower conductivity than Nafion (TM) 117. The VRB containing the block copolymer membrane exhibits higher coulombic efficiency and similar energy efficiency compared to a VRB using Nafion (TM) 117. The better vanadium ion selectivity of the block copolymer membrane has led to a much smaller capacity loss during 50 charge-discharge cycles for the VRB. (C) 2013 Published by Elsevier B.V.
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