An inorganic-organic hybrid polymer electrolyte based on organically modified polysiloxane was prepared bv UV radiation curing in the presence of liquid electrolyte．The organically modified polysiloxane with acrylate groups at the terminal positions was synthesized by hydrolytic condcnsadon of tetramethoxysilane and followed by ester exchange reaction using 2-hydroxyethyl acrylate．This monomer was polyfunctional with the rational formula of SiO1.143(OH)0.016(OCH3)1.339(OCH2CH2OCOCH=CH2)0.357 obtained from 1H-NMR analysis

FT-IR analysis and silica analysis．The electrochemical properties of the inorganic-organic hybrid polymer electrolyte were determined by ac impedance and cyclic voltammetry．Ionic conductivity was greatly enhanced with increasing amounts of liquid electrolyte．When the polymer electrolyte contained 85 wt％ liquid electrolytes

the conductivity was around 5.5 x 10-3 Scm-1 at 22℃ and 1.1×10-3 S cm-1 even at -23℃．Interface resistance increased initially and reached a steady value after 2 days．Oxidation stability was up to 5.0 V against the hthium reference electrode

and electrochemical plating/stripping of lithium on the stainless steel electrode was reversible．