| 초록 |
Recently, Vanadium redox flow battery (VRFB) is one kind of attractive ESS for its low cost and flexible design. For the operation of VRFB, ion exchange membrane determines performance. Commercially, Nafion membrane is used for ion exchange membrane for VRFB. But it has high vanadium ion permeability, which is main reason of self-discharge reaction, is major defect to be used in VRFB. In this study, the anion exchange membrane is synthesized from poly(arylene ether ketone) containing imidazolium groups as functional groups for anion exchange membrane. The synthesized membranes showed higher value of ion exchange capacity than Nafion® 117 membranes. All of the synthesized membranes showed significantly low vanadium ion permeability compared to Nafion® 117 membranes. In addition, during the charge-discharge cycling test, membrane in which the mole ratio of imidazolium group to PAEK is 2:1 shows higher coulombic and energy efficiencies than Nafion® 117 membrane without any degradation. |
