| 초록 |
Solid polymer electrolytes with high ionic conductivities are much sought after forthe development of solid-state batteries, electrochromic devices, and sensors, etc. Organicsolid electrolytes, as well as inorganic ones, have been widely studied, especiallypolymeric solid electrolytes are expected to be excellent composites because of theirflexibility and processibility. To develop polymeric solid electrolytes with highperformance, their physicochemical properties should be clarified. Adam and Gibbsdeveloped the configurational entropy model for polymer properties, which has beendiscussed extensively by Goldstein, and many research groups have used this model fordescribing the dependence of conductivity on temperature. Investigating themanufacturing process of lithium polymer battery, there is a pressure imposed on theSPE to improve the degree of contact between electrolyte and electrode. Physicalproperties of the compressed SPE systems would be totally different from those of theincompressed SPE systems. Further, when plasticized SPE is used, the effect will beeven greater. In this study, based on the Adam-Gibbs configurational entropy model andthe modified lattice fluid model, we develop a thermodynamic model taking into accountthe pressure effect on the ionic conductivities of the compressed SPE systems. InPEO/ZnBr2 system, values of salt-salt and polymer-salt interaction energy parameters,which are obtained from the melting point depression data, are directly used to predictthe change of ionic conductivity with various pressure. |
