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Received June 14, 2013
Accepted August 2, 2013
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비수계 바나듐 레독스 흐름 전지를 위한 상용 멤브레인의 특성분석
Characterization of Commercial Membranes for Non-aqueous Vanadium Redox Flow Battery
광주과학기술원 환경공학부, 500-712 광주광역시 북구 첨단과기로 123
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-Gwagiro, Buk-gu, Gwangju 500-712, Korea
shmoon@gist.ac.kr
Korean Chemical Engineering Research, October 2013, 51(5), 615-621(7), 10.9713/kcer.2013.51.5.615 Epub 1 October 2013
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Abstract
본 연구에서는 수계 레독스 흐름전지에서 사용하는 멤브레인 특성분석방법을 개선하여 비수계 레독스 흐름 전지를 위한 멤브레인 특성분석방법을 확립하였다. 비수계 레독스 흐름 전지에 적합한 멤브레인 특성을 확인하기 위해 상용 멤브레인의 이온교환능력, 이동수, 이온 전도도, 활물질 투과도, 전지효율 실험 등 특성분석들을 수행하였다. 상용 음이온 교환 멤브레인의 특성분석 실험을 통해 충·방전 효율 및 에너지효율과 이온 선택성의 상관관계를 조사하였다. Neosepta AHA 음이온 교환 멤브레인은 이동수 측정에서 0.81의 값으로 비수계 전해질에서 비교적 낮은 이온 선택성을 보였지만, 충방전 전지효율 평가에서는 92%의 충·방전효율과 86%의 에너지효율을 각각 나타내었다. 또한 이온의 선택성이 없는 다공성 멤브레인은 높은 전류밀도의 비수계 레독스 흐름 전지에 적절함을 알 수 있었다._x000D_
Membrane characterization methods for aqueous redox flow batteries aqueous RFBs were modified for non-aqueous RFBs. The modified characterization methods, such as ion exchange capacity, transport number, permeability and single cell test, were carried out to evaluate commercial membranes in non-aqueous electrolyte. It was found that columbic efficiency and energy efficiency in a single cell test were dependent on the ion selectivity of commercial anion exchange membranes. Neosepta AHA anion exchange membrane showed the anion transport number of 0.81, which is a relatively low ion selectivity in non-aqueous electrolyte, however, exhibited 92% of coulombic efficiency and 86% of energy efficiency in a single cell test. It was also found that a porous membrane without ion selectivity is suitable for a non-aqueous redox flow battery at a high current density.
Keywords
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Liu Q, Sleightholme AES, Shinkle AA, Li Y, Thompson LT, Electrochem. Commun., 11(12), 2312 (2009)
Matsuda Y, Tanaka K, Okada M, Takasu Y, Morita M, J. Appl. Electrochem., 18(6), 909 (1988)
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Liu Q, Shinkle AA, Li Y, Monroe CW, Thompson LT, Sleightholme AES, Electrochem. Commun., 12(11), 1634 (2010)
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