Composite membranes are prepared by sulfonated poly(ether ether ketone) (sPEEK) / poly(vinylidene fluoride) (PVdF) / urethane acrylate non-ionomer (UAN) for vanadium redox flow battery (VRFB). To make sPEEK and PVdF compatible each other, amphiphilic polymer, UAN, is introduced into the composite membrane. By increasing the content of UAN, proton conductivity increases, while permeability decreases, therefore, the selectivity increases. This is attributed to improved compatibility in the composite membrane, which is confirmed by analyzing morphology on its cross-section. The performance of these VRFBs is better than that of VRFB including Nafion 212 due to high selectivity. Based on these results, it is revealed that composite membrane is useful for enhancement in VRFB performance.

• 정호영(전남대학교 환경에너지공학과) | Ho-Young Jung