Poly(ethylenglycol)dimethylether-lithium bis(trifluoromethanesulfonyl)imide, PEG500DME-LiTFSI, as high viscosity electrolyte for lithium ion batteries

► A PEG500DME-LiTFSI high viscosity, safe electrolyte is here reported. ► The electrolyte shows enhanced electrochemical properties. ► A battery using TiO2 anode, LiCoO2 cathode and the electrolyte is studied. ► The 2 V-battery is characterized by high stability and low polarization. ► The electrolyte is a promising candidate for application in Li-ion battery.