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Korean Chemical Engineering Research,
Vol.52, No.2, 182-186, 2014
Vol.52, No.2, 182-186, 2014
바나듐 레독스-흐름 전지에서 집전체의 전기화학적 특성
Electrochemical Properties of Current Collector in the All-vanadium Redox Flow Battery
두 종류의 집전체(BP, bipolar plate)를 사용하여 바나듐 레독스-흐름 전지(V-RFB, vanadium redox-flow battery)의 성능을 평가하였다. V-RFB의 성능평가는 60 mA/cm2의 전류밀도에서 진행하였다. A 집전체를 사용한 V-RFB의 기전력 (SOC 100%에서의 OVC)은 1.47V, B 집전체를 사용한 V-RFB의 기전력은 1.54V를 나타냈다. A 집전체를 사용한 VRFB의 셀 저항은 충전시에 4.44~5.00 Ω·cm2을, 방전시에 3.28~3.75 Ω·cm2를 보였으며, B 집전체를 사용한 V-RFB의 셀 저항은 충전시에 4.19~4.42Ω·cm2, 방전시에 4.71~5.49Ω·cm2를 나타냈다. 각 집전체를 사용한 V-RFB의 성능은 5회 충방전 실험을 진행하여 평가하였다. A 집전체를 사용한 V-RFB는 평균 전류효율 93.1%, 평균 전압효율 76.8%, 평균 에너지효율 71.4%를 나타냈으며, B 집전체를 사용한 V-RFB는 평균 전류효율 96.4%, 평균 전압효율 73.6%, 평균 에너지효율 71.0%를 나타냈다.
Two commercial carbon plates were evaluated as a current collector (bipolar plate) in the all vanadium redoxflow battery (V-RFB). The performance properties of V-RFB were test in the current density of 60 mA/cm2. The electromotive forces (OCV at SOC 100%) of V-RFB using A and B current collector were 1.47 V and 1.54 V. The cell resistance of V-RFB using A current collector was 4.44~5.00 Ω·cm2 and 3.28~3.75 Ω·cm2 for charge and discharge, respectively. The cell resistance of V-RFB using B current collector was 4.19~4.42Ω·cm2 and 4.71~5.49Ω·cm2 for charge and discharge, respectively. The performance of V-RFB using each current collector was evaluated. The performance of V-RFB using A current collector was 93.1%, 76.8% and 71.4% for average current efficiency, average voltage efficiency and average energy efficiency, respectively. The performance of V-RFB using B current collector was 96.4%, 73.6% and 71.0% for
average current efficiency, average voltage efficiency and average energy efficiency, respectively.
Keywords:
Redox-flow Battery; Vanadium Redox-flow Battery; Current Collector; Energy Efficiency; Cell Resistance
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