Highly efficient vanadium redox flow batteries enabled by a trilayer polybenzimidazole membrane assembly

Authors
Bui, Trung TuyenShin, MingyuRahimi, MohammadBentien, AndersKwon, YongchaiHenkensmeier, Dirk
Issue Date
2024-07
Publisher
Wiley
Citation
Carbon Energy, v.6, no.7
Abstract
A novel polybenzimidazole (PBI)-based trilayer membrane assembly is developed for application in vanadium redox flow battery (VRFB). The membrane comprises a 1 mu m thin cross-linked poly[2,2'-(p-oxydiphenylene)-5,5'-bibenzimidazole] (OPBI) sandwiched between two 20 mu m thick porous OPBI membranes (p-OPBI) without further lamination steps. The trilayer membrane demonstrates exceptional properties, such as high conductivity and low area-specific resistance (ASR) of 51 mS cm(-1) and 81 m Omega cm(2), respectively. Contact with vanadium electrolyte increases the ASR of trilayer membrane only to 158 m Omega cm(2), while that of Nafion is 193 m Omega cm(2). VO2+ permeability is 2.73 x 10(-9) cm(2) min(-1), about 150 times lower than that of Nafion NR212. In addition, the membrane has high mechanical strength and high chemical stability against VO2+. In VRFB, the combination of low resistance and low vanadium permeability results in excellent performance, revealing high Coulombic efficiency (>99%), high energy efficiency (EE; 90.8% at current density of 80 mA cm(-2)), and long-term durability. The EE is one of the best reported to date.
Keywords
SOLVENT; STORAGE; ENERGY; PROTON-EXCHANGE MEMBRANES; CONDUCTIVITY; PERFORMANCE; DEGRADATION; STABILITY; MECHANISM; trilayer; VRFBs; polybenzimidazole; porous membrane; proton conductivity
ISSN
2637-9368
URI
https://pubs.kist.re.kr/handle/201004/149289
DOI
10.1002/cey2.473
Appears in Collections:
KIST Article > 2024
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE