Poly [siloxane-g-oligo(ethylene oxide)] tetraacrylate cross-linker was synthesized, and the gel polymer electrolytes (GPE) was prepared by thermal curing using them. Increase of conductivity with decrease of T, was observed as the content of liquid electrolyte increased. Maximum conductivity was found to be 3.92 x 10(-3) S/cm at 30degreesC with a 70 wt.% 1 M LiPF6 in EC/PC (1:1). The electrochemical stability of the resulting gel polymer electrolyte could be extended to up to 4.4 V. Applicability of the resulting polymer electrolyte for lithium battery was tested by Li\GPE\LiCoO2 cell. (C) 2004 Elsevier Ltd. All rights reserved.