| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.435 |
| 발표분야 | 기능성 고분자 |
| 제목 | The Effect of Salt Concentration on Ion Conduction Mechanism in Poly(vinyl alcohol)-based Mg-conducting SPE |
| 초록 | Li-ion batteries are widely used as power sources for portable electronic devices, but Li cation used in these batteries has defects such as low compatibility with polymers, high reactivity and safety problem. Therefore, divalent cation, Mg2+ is used as salt in this study to overcome these problems. And to obtain not only the high ionic conductivity but the good physical properties, we tried to prepare Mg-conducting solid polymer electrolytes based on poly(vinyl alcohol) using solvent casting. From this work, it could be known that the fast ion-conducting process through network-like connected large ion aggregates was started to be formed at 25wt% salt concentration and Mg cations could move by ion hopping decoupled from the segmental motion of polymer. At first, from ac impedance, we investigated the ionic conductivity. Conductivity of prepared SPE increased with increasing the salt concentration and maximum conductivity of 10-4S/cm showed in the highest salt concentration. And, we observed the changes of salt form with various salt concentrations by FT-IR measurement and analyzed the changes of crystallinity by XRD. Finally, using AFM, we confirmed the contribution of‘ion aggregates’to the ion conduction mechanism of PVA-based Mg-conducting solid polymer electrolytes (see Fig.1). Fig. 1. Fraction of ‘free ion’ and ‘ion aggregates’ with salt concentrations for PVA-Mg(CF3SO3)2 SPE |
| 저자 | 정수경, 조윤경, 조남주 |
| 소속 | 부산대 |
| 키워드 | solid polymer electrolyte; ion conduction mechanism |
