A cationic networked polymer solid electrolyte (Met-IL/EGDMA/LiTFSI) synthesized by copolymerization of 1-(2-methacryloyl)ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (Met-IL) and ethylene glycol dimethacrylate (EGDMA) in the presence of lithium bis(trifluromethanesulfonyl)imide (LiTFSI) showed higher ionic conductivity (1.0 x 10(-2) S/m) than the corresponding non-ionic networked polymer solid electrolyte (MMA/EGDMA/LiTFSI) (< 1.0 x 10(-3) S/m) prepared by copolymerization of methyl methacrylate (MMA) and EGDMA in the presence of LiTFSI. A gel polymer electrolyte composed of the cationic networked polymer Met-IL/EGDMA and propylene carbonate (PC) solution of LiTFSI prepared by copolymerization of Met-IL and EGDMA in a PC solution of LiTFSI showed much higher ionic conductivity (3.0 x 10(-1) S/m) than the solid polymer electrolyte.