Electrochemical characters of cross-linkable oligo(oxyethylene) branched low molecular weight poly(organophosphazenes)

The ionic conductivities of all-solid polymer electrolytes prepared by UV irradiation crosslinkable oligo(oxyethylene) branched low molecular weight poly(organophosphazenes) macromonomers are reported. The dimensional stability of the poly(organophosphazes) electrolytes was improved by crosslinking. The temperature dependence of ionic conductivity of the all-solid polymer electrolytes followed the Vogel-Tamman-Fulcher equation. Furthermore, the effects of the length of the oligo(oxyethylene) chain and the degree of crosslinking on the ionic conductivity of the polymer electrolytes are discussed. The stability of the lithium electrode and the all-solid polymer electrolytes interface were evaluated by measuring the alternating current impedance on symmetric cells. The maximum ionic conductivity of the all-solid polymer electrolyte was obtained as high as 2.92 X 10(-4) sec/cm at 25 degrees C. Copyright (c) 2006 John Wiley & Sons, Ltd.