A series of diethylethyletherylmethanamine bis(trifluoromethanesulfonyl)imide (DEEYTFSI) ionic liquid gel polymer electrolyte based polyurethane acrylate (PUA)/poly(-methyl methacryltae) (PMMA) matrix with different contents of DEEYTFSI, PUA and LiTFSI were prepared via ultraviolet (UV) curing system. Electrochemical performances of the gel polymer were studied by electrochemical station and charge discharge system. The gel polymer electrolyte with 19 wt.% DEEYTFSI obtained a maximum conductivity a of 2.76 x 10(-4) S cm(-1) and the transference number t(Li+) of similar to 0.22 at room temperature. 19 wt.% DEEYTFSI caused the easier transferring of lithium ions due to less apparent activation energy E-a of 21.1 kJ mol(-1). The DEEYTFSI/LiTFSI/PUA/PMMA electrolyte had good compatibility with LiFePO4 cathode. The DEEYTFSI/LiTFSI/PUA/PMMA electrolyte with the electrochemical window of 4.70 V was enough stability for being the electrolyte material of lithium battery. The Li/19 wt.% DEEYTFSI-LiTFSI-PUA-PMMA/LiFePO4 coin-typed cell cycled at 0.1 C presented 95% efficiency on the 50th cycle. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.