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

Yona Lee, Sangwon Kim, Artjom Maljusch, Oliver Conradi, Hyoung Juhn Kim, Jong Hyun Jang, Jonghee Han, Jihyun Kim, Dirk Henkensmeier

Research output: Contribution to journalArticle

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 mS cm −1 after doping in 2 M sulfuric acid, 2–4 times higher than for doped PBI. Permeability for VO 2+ ions was 0.8 × 10 −12 m 2 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.

Original languageEnglish
Pages (from-to)210-217
Number of pages8
JournalPolymer
Volume174
DOIs
Publication statusPublished - 2019 Jun 12
Externally publishedYes

Fingerprint

Vanadium
Ions
Membranes
X ray scattering
Bromides
Sulfuric acid
Functional groups
Energy efficiency
Chlorides
Ion exchange
Tensile strength
Elastic moduli
Doping (additives)
Electric potential
Flow batteries
sulfuric acid

Keywords

  • 2-Mesityl benzimidazolium
  • Polybenzimidazole
  • Vanadium redox flow battery (VRFB)

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries. / Lee, Yona; Kim, Sangwon; Maljusch, Artjom; Conradi, Oliver; Kim, Hyoung Juhn; Jang, Jong Hyun; Han, Jonghee; Kim, Jihyun; Henkensmeier, Dirk.

In: Polymer, Vol. 174, 12.06.2019, p. 210-217.

Research output: Contribution to journalArticle

Lee, Yona ; Kim, Sangwon ; Maljusch, Artjom ; Conradi, Oliver ; Kim, Hyoung Juhn ; Jang, Jong Hyun ; Han, Jonghee ; Kim, Jihyun ; Henkensmeier, Dirk. / Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries. In: Polymer. 2019 ; Vol. 174. pp. 210-217.
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