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In this study,muti-armed PEO phosphate crosslinker and polyphosphoester were synthesized and introduced into SPEs.Novel semi-interpenetrating networks (semi-IPN) SPE was prepared by in-situ radical polymerization of a precursor solution containing lithium salt,polyphosphoester and crosslinker based on phosphate.The phosphate-based compound is a well-known fire retardant which may improve the electrochemical and thermal stability of a lithium battery.The ionic conductivity of SPEs was achieved with great enhancement,which may due to the muti-armed structure prevent crystallization and thus to enhance the ionic conductivity at low temperature.In particular,the oligo(ethylene oxide) group introduced into the crosslinker can improve the compatibility with the polyphosphoester whereas the methacrylate functional group attached can establish the 3D network structure of polymer electrolyte.Further studies of ionic conductivity for polymer electrolytes were optimized according to several factors.Other electrochemical properties including cyclic voltammetric study etc.have also been studied for this SPE system.