| 초록 |
Due to the increasing demands of wearable devices, the development of flexible energy storage devices with high performances has received much attention. In this work, we prepared poly(vinyl alcohol) (PVA)-based solid polymer electrolytes (SPEs) by combining a mixture of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM-TFSI = BMIM+ TFSI-) and phosphoric acid (H3PO4 = H+ H2PO4-) as ionic charge carrier. The mixture of BMIM-TFSI and H3PO4 acts as proton conducting ionic liquids because it has an acidic anion. PVA exhibits a good thermal property, mechanical strength, and chain flexibility due to its hydroxyl group that provides hydrogen bonding between ionic liquid and PVA. Furthermore, after assembling the SPEs with electrodes, we fabricated solid-state supercapacitors, and their electrochemical properties were investigated using electrochemical impedance spectroscopy. |
