Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Development of Carbon Composite Bipolar Plates for Vanadium Redox Flow Batteries

  • Lee, Nam Jin (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Lee, Seung-Wook (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Kim, Ki Jae (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Kim, Jae-Hun (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Park, Min-Sik (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Jeong, Goojin (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Kim, Young-Jun (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Byun, Dongjin (Department of Materials Science and Engineering, Korea University)
  • Received : 2012.05.01
  • Accepted : 2012.08.01
  • Published : 2012.11.20
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Abstract

Carbon composite bipolar plates with various carbon black contents were prepared by a compression molding method. The electrical conductivity and electrochemical stability of the bipolar plates have been evaluated. It is found that the electrical conductivity increases with increasing carbon black contents up to 15 wt %. When the carbon black contents are greater than 15 wt %, the electrical conductivity decreases because of a poor compatibility between epoxy resin and carbon black, and a weakening of compaction in the carbon composite bipolar plate. Based on the results, it could be concluded that there are optimum carbon black contents when preparing the carbon composite bipolar plate. Corrosion tests show that the carbon composite bipolar plate with 15 wt % carbon black exhibits better electrochemical stability than a graphite bipolar plate under a highly acidic condition. When the optimized carbon composite bipolar plate is applied to vanadium redox flow cells, the performance of flow cells with the carbon composite bipolar plate is comparable to that of flow cells with the graphite bipolar plate.

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References

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