PREPARATION AND IONIC CONDUCTIVITIES OF THE PLASTICIZED POLYMER ELECTROLYTES BASED ON POLY(METHYL METHACRYLATE-CO-ALKALI METAL METHACRYLATE)

Ionic conductivities of the polymer electrolytes prepared from the ion omer (poly(methyl methacrylate-co-alkali metal methacrylate)), lithium perchlorate, and ethylene carbonate as a plasticizer, were studied as a function of the ion content and the alkali-metal cation of the iono mer. It was possible to obtain tough films with room-temperature ionic conductivities of similar to 10(-3) S/cm. The maximum ion conductivit ies of the polymer electrolytes were obtained at the ion content of 5 mol % for both Li and Na ionomer. The effects of the ion content of th e ionomer on the ionic conductivities of the polymer electrolytes were mainly interpreted in terms of the characteristics of the ion aggrega te formed in the polymer electrolytes. The thermal dependence of the i onic conductivity was shown to be a non-VTF pattern in some of the pol ymer electrolytes investigated, which is expected to be due to the pre sence of the ion aggregate. (C) 1996 John Wiley & Sons, Inc.