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Counter anion effects in anion exchange membrane-fabricated non-aqueous vanadium redox flow battery
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  • Journal title : Analytical Science and Technology
  • Volume 28, Issue 5,  2015, pp.341-346
  • Publisher : The Korean Society of Analytical Science
  • DOI : 10.5806/AST.2015.28.5.341
 Title & Authors
Counter anion effects in anion exchange membrane-fabricated non-aqueous vanadium redox flow battery
Son, Pyeong Soo; Oh, Min-Seok; Ye, Jun-Hee; Choi, Seong-Ho;
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 Abstract
In order to understand the counter anionic effects in a non-aqueous vanadium redox flow battery (VRFB), we synthesized four types of electrolyte salts (1-ethyltriethamine tertafluoroborate, [E-TEDA]+[BF4], 1-ethyltriethamine hexafluorophosphate, [E-TEDA]+[PF6], 1-butyltriethylamine tertafluoroborate, [B-TEDA]+[BF4], and 1-buthyltriethamine hexafluorophosphate [B-TEDA]+[PF6]) by counter anion exchange reaction after the SN2 reaction. We confirmed the successful synthesis of the electrolyte salts [E-TEDA]+[Br] and [B-TEDA]+[Br] via 1H-NMR spectroscopy and GC-mass analysis before the counter anion exchange reaction. The electric potential of the vanadium acetylacetonate, V(acac)3, as an energy storage chemical was shown to be 2.2 V in the acetonitrile solvent with each of the [E-TEDA]+[BF4], [E-TEDA]+[PF6], [B-TEDA]+[BF4], and [B-TEDA]+[PF6] electrolyte salts. In a non-aqueous VRFB with a commercial Neosepta AFN membrane, the maximum voltages reached 1.0 V and 1.5 V under a fixed current value of 0.1 mA in acetonitrile with the [E-TEDA]+[BF4] and [E-TEDA]+[PF6] electrolyte salts, respectively. The maximum voltage was 0.8 V and 1.1 V under a fixed current value of 0.1 mA in acetonitrile with the [B-TEDA]+[BF4] and [B-TEDA]+[PF6] electrolyte salts, respectively. From these results, we concluded that in the non-aqueous VRFB more of the [PF6] counter anion than the [BF4] counter anion was transported onto the commercial Neosepta AFN anion exchange membrane.
 Keywords
Non-aqueous vanadium redox flow battery;Electrolyte salts;Triethyldiamine;Vanadium acetylacetonate;energy storage chemicals;
 Language
English
 Cited by
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