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Efforts to increase ionic conductivity of polymer electrolyte membranes for lithium ion battery applications have been carried out in this study by combining electrolyte salts. Polymer electrolyte membranes function as electrolyte and separator in battery cells. The polymer electrolyte membrane is composed of poly (vinylidene fluoride co hexaflouropropylene) (PVdF co HFP) as polymer, titanium oxide (TiO2) as filler, and lithium bis (oxalate) borate (LiBOB) and Lithium bis trifluoromethanesulfonimide (LiTFSI) electrolyte alloys as salt has been made with the solution casting method at room temperature. Polymer electrolyte membranes are characterized using Electrochemical Impedance Spectroscopy (EIS) to determine conductivity, X Ray Diffractometer (XRD) to determine material crystallinity, and Scanning Electron Microscope (SEM) to determine the surface morphology of polymer electrolyte membranes. The test results using EIS showed that samples containing 23% LiTFSI and 5% LiBOB had the highest conductivity (2.35 x 10^-6 S/cm) compared to other samples. These results are reinforced by XRD and SEM analysis which showed that the sample has the lowest crystallinity that makes the ion movement higher and the appearance of pores on the surface of the membrane with a diameter of around 2 to 5 micro meter.