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The Membrane Society of Korea (한국막학회)
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Preparation and Electrochemical Applications of Pore-filled Ion-exchange Membranes with Well-adjusted Cross-linking Degrees: Part I. All Vanadium Redox Flow Battery

가교도가 조절된 세공충진 이온교환막의 제조 및 전기화학적 응용: Part I. 전 바나듐 레독스 흐름전지

  • Lee, Ji-Eun (Department of Green Chemical Engineering, Sangmyung University) ;
  • Park, Ye-Rin (Department of Green Chemical Engineering, Sangmyung University) ;
  • Kim, Do-Hyeong (Department of Green Chemical Engineering, Sangmyung University) ;
  • Kang, Moon-Sung (Department of Green Chemical Engineering, Sangmyung University)
  • 이지은 (상명대학교 그린화학공학과) ;
  • 박예린 (상명대학교 그린화학공학과) ;
  • 김도형 (상명대학교 그린화학공학과) ;
  • 강문성 (상명대학교 그린화학공학과)
  • Received : 2017.10.23
  • Accepted : 2017.10.26
  • Published : 2017.10.31
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Abstract

In this study, we have developed pore-filled ion-exchange membranes (PFIEMs) filled with ionomer in a thin polyethylene porous film (thickness = $25{\mu}m$) and investigated the charge-discharge characteristics of the all vanadium redox flow battery (VRFB) employing them. Especially, the degree of crosslinking and free volume of the PFIEMs were appropriately controlled to produce ion-exchange membranes exhibiting both the low membrane resistance and low vanadium permeability by mixing crosslinking agents having different molecular size. As a result, the prepared PFIEMs exhibited excellent electrochemical properties which are comparable to those of the commercial membranes. Also, it was confirmed through the experiments of vanadium ion permeability and VRFB performance evaluation that the PFIEMs showed low vanadium ion permeability and high charge-discharge efficiency in comparison with the commercial membrane despite their thin film thickness.

본 연구에서는 얇은 폴리에틸렌 계 다공성 필름(두께 = $25{\mu}m$)에 이오노머를 충진시킨 세공충진 이온교환막을 개발하였으며 이를 적용한 전 바나듐 레독스 흐름전지의 충방전 특성을 고찰하였다. 특히 분자 크기가 다른 가교제를 혼합함으로써 이온교환막의 가교도 및 자유체적을 적절히 제어하여 저저항 및 저 바나듐 투과도를 나타내는 이온교환막을 제조하고자 하였다. 실험 결과, 제조된 세공충진 이온교환막은 상용막 대비하여 동등 수준의 우수한 전기화학적 특성을 나타내었다. 또한 바나듐 이온 투과도 및 전 바나듐 레독스 흐름전지 성능 평가 실험을 통해 얇은 막 두께에도 불구하고 상용막 대비하여 낮은 바나듐 이온 투과도와 높은 충방전 효율을 나타냄을 확인하였다.

Keywords

References

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