Redox Pairs in Redox Flow Batteries

: Vanadium redox flow battery (VRFB) is an energy conversion device in which charging and discharging are alternatively carried out by oxidation and reduction reactions of vanadium ions with different oxidation states. VRFB consists of electrolyte, electrode, ion-exchange membrane, etc. The role of ion-exchange membranes in VRFB separates anolyte and catholyte and provides a high conductivity to hydrogen ions. Recently much attention has been devoted to develop ideal ion-exchange membranes for VRFB. A number of developed ion-exchange membranes should be evaluated to find out ideal ion-exchange membranes for VRFB. Long-term durability test is a crucial characterization of ion-exchange membranes for commercialization, but is very time-consuming. In this study, the life time prediction protocol of ion-exchange membranes in VRFB cell tests was developed through short-term single cell performance evaluation (real total operation time, 87.5 hrs) at three different current densities. We confirmed a decrease in test time up to 96.2% of real durability tests (expected total operation time, 2,296 hrs) and 5~6% of relative error discrepancy between the predicted and the real life time in a unit cell.

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Perfluorinated Sulfonic Acid based Composite Membranes for Vanadium Redox Flow Battery

Cho¹,

Park²

2016

Journal of the Korean Electrochemical Society

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: Vanadium redox flow batteries (VRFBs) using the electrolytes containing various vanadium ions in sulfuric acid as supporting solution are one of the energy storage devices in alternatively charging and discharging operation modes. The positive electrolyte contains V 5+ / V 4+ and the negative electrolyte V 2+ /V 3+ depending on the operation mode. To prevent the mixing of two solutions, proton exchange membranes are mainly used in VRFBs. Nafion 117 could be the most promising candidate due to the strong oxidative property of V 5+ ion, but causes high crossover of electroactive species to result in a decrease in coulombic efficiency. In this study, the composite membranes using Nafion ionomer and porous polyethylene substrate were prepared to keep good chemical stability and to decrease the cost of membranes, and were compared to the properties and performance of the commercially available electrolyte membrane, Nafion 117. As a result, the water uptake and ionic conductivity of the composite mem-

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Redox Pairs in Redox Flow Batteries

Cited by 5 publications

References 68 publications

Numerical Investigation of the Discharge Efficiency of a Vanadium Redox Flow Battery with Varying Temperature and Ion Concentration

Numerical Investigation of the Discharge Efficiency of a Vanadium Redox Flow Battery with Varying Temperature and Ion Concentration

Prediction of Life Time of Ion-exchange Membranes in Vanadium Redox Flow Battery

Perfluorinated Sulfonic Acid based Composite Membranes for Vanadium Redox Flow Battery

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