Electrochemical properties of current collector in the all-vanadium redox flow battery

Abstract

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.