A Vanadium-Cerium Redox Flow Battery with an Anion-Exchange Membrane Separator

摘要

Cardo-poly(etherketone)-based anion-exchange membranes (AEMs) were prepared and employed as separators in a vanadium-cerium redox flow battery (V-Ce RFB). V-Ce RFBs with AEM separators yielded energy efficiencies (EEs) ranging from 67 to 84% at current densities between 20 and 80 mAcm(-2). V-Ce RFBs using Nafion 212 as the separator had EEs ranging from 50 to 84% and displayed a capacity and efficiency loss as a result of cation intermixing. Over 20 charge/discharge cycles, the RFB with the AEM separator yielded unchanged efficiencies and capacity, whereas the loss of capacity was 50% with the Nafion separator. There was no substantial change in the ionic conductivity, ultimate tensile strength, and Young's modulus of AEMs after 50 charge/discharge cycles. This suggests that AEMs are promising candidates as V-Ce RFB separators that: 1) are chemically and mechanically stable during cycling, and 2) act as efficient barriers that preclude the intermixing of vanadium and cerium cations.