| 초록 |
Water-splitting electrodialysis using ion-exchange membranes (IEMs) is known as an economical and eco-friendly LiOH production process. In this study, composite IEMs with optimal properties for electrochemical LiOH production have been developed through the preparation of a pore-filled type of base membranes and their surface modification. PPO was chosen as a base polymer for effective surface modification, and the hydrophilicity and electrostatic force were controlled by introducing zwitterionic groups of various structures into PPO. In particular, H+ and OH- leakages and monovalent ion selectivity of the membranes, which have a great influence on the performance of the LiOH process, were evaluated. As a result, it was confirmed that the surface-modified composite IEMs showed excellent electrochemical properties and LiOH production efficiency compared to the commercial membranes. This work was supported in part by the MOTIE (No. 20010491) and the MSIT (No. 2019R1A2C1089286). |
