Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries

Title
Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries
Authors
한종희김형준장종현헨켄스마이어디억Yona LeeSangwon KimArtjom MaljuschOliver ConradiJihyun Kim
Keywords
Vanadium redox flow battery (VRFB); Polybenzimidazole; 2-Mesityl benzimidazolium
Issue Date
2019-06
Publisher
Polymer
Citation
VOL 174-217
Abstract
1-(6-bromohexyl)-3-methyl-2-(2,4,6-trimethylphenyl)-2H-benzimidazolium bromide was synthesised and grafted onto polybenzimidazole (PBI). The highest obtained degrees of functionalisation were 0.7 and 1.1 ionic groups per repeat unit, corresponding to ion exchange capacities of 1.25 and 1.55  mmol chloride/g. While the latter material had much reduced tensile strength and Young's modulus, the material with a lower degree of functionalisation showed properties similar to PBI and was therefore further investigated. X-ray scattering showed that the functional group reduced the crystallinity. Conductivity was in the range of 2– 3  mS  cm− 1, but increased to 23  1 after doping in 2  M sulfuric acid, 2– 4 times higher than for doped PBI. Permeability for VO2+ ions was 0.8  ×  10− 12  m2  s− 1. In the vanadium redox flow battery, the grafted PBI showed higher coulomb and voltage efficiency than PBI, and therefore also higher energy efficiency.
URI
http://pubs.kist.re.kr/handle/201004/69351
ISSN
0032-3861
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KIST Publication > Article
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