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The Membrane Society of Korea (한국막학회)
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A Study on the Effect of Different Functional Groups in Anion Exchange Membranes for Vanadium Redox Flow Batteries

바나듐 산화환원 흐름전지를 위한 음이온교환막의 관능기에 따른 특성 연구

  • Lee, Jae-Myeong (Hydrogen and Fuel Cell Center for Industry, Academy, and Laboratories, Korea Institute of Energy Research) ;
  • Lee, Mi-Soon (Hydrogen and Fuel Cell Center for Industry, Academy, and Laboratories, Korea Institute of Energy Research) ;
  • Nahm, Ki-Seok (Department of Energy Storage and Conversion Engineering) ;
  • Jeon, Jae-Deok (Hydrogen and Fuel Cell Center for Industry, Academy, and Laboratories, Korea Institute of Energy Research) ;
  • Yoon, Young-Gi (Hydrogen and Fuel Cell Center for Industry, Academy, and Laboratories, Korea Institute of Energy Research) ;
  • Choi, Young-Woo (Hydrogen and Fuel Cell Center for Industry, Academy, and Laboratories, Korea Institute of Energy Research)
  • 이재명 (한국에너지기술연구원 수소연료전지산학연협력센터) ;
  • 이미순 (한국에너지기술연구원 수소연료전지산학연협력센터) ;
  • 남기석 (전북대학교 대학원 에너지저장변환공학과) ;
  • 전재덕 (한국에너지기술연구원 수소연료전지산학연협력센터) ;
  • 윤영기 (한국에너지기술연구원 수소연료전지산학연협력센터) ;
  • 최영우 (한국에너지기술연구원 수소연료전지산학연협력센터)
  • Received : 2017.10.20
  • Accepted : 2017.10.26
  • Published : 2017.10.31
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Abstract

Commonly cation exchange membranes have been used for vanadium redox flow batteries. However, a severe vanadium ion cross-over causes low energy efficiency. Thus in this study, we prepared 3 different anion exchange membranes to investigate the effect on the membrane properties such as vanadium ion cross-over and long term stability. The base membranes were prepared by an electrolyte pore filling technique using vinyl benzyl chloride (VBC), divinylbenzene (DVB) within a porous polyethylene (PE) substrate. Then 3 different functional amines were introduced into the base membranes, respectively. These resulting membranes were evaluated by physico-chemical properties such as ion exchange capacity, dimensional stability, vanadium ion cross-over and membrane area resistance. Conclusively, TEA-functionalized membrane showed longest term stability than other membranes although all the membranes are similar to coulombic efficiency.

바나듐 산화환원 흐름 전지에 핵심적으로 사용되는 이온교환막은 일반적으로 양이온교환막을 사용하고 있으나 co-ion인 바나듐 이온의 투과에 의한 장기적 성능 저하 문제를 해결하기 어렵다. 따라서 본 연구에서는 바나듐 투과도 및 장기 운전 안정성의 특성을 파악하기 위해 세 가지 다른 관능기를 보유한 음이온교환막을 제조하였다. 기저막으로는 다공성 폴리에틸렌 필름에 benzyl chloride (VBC)과 divinylbenzene (DVB)을 충진 및 가교 중합하여 제조한 후, 세 가지 다른 아민 관능기를 각각 도입하였다. 제조된 음이온교환막들에 대해 바나듐 이온 투과 정도 및 장기 운전 안정성을 관찰한 결과 triethylamine을 관능기로 적용한 음이온교환막에서 높은 에너지효율을 유지하면서도 가장 장기적 운전 안정성을 확보할 수 있었다.

Keywords

References

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