In this work, we showed the results of the characterization of ether based electrolytes for Li-O-2 batteries, prepared by mixing TEGDME and N-methoxyethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)-imide ionic liquid (IL). The mixtures having different ratio TEGDME/IL and containing LiCF3SO3 salt, were thoroughly characterized by thermal analysis, conductivity and electrochemical stability measurements. Their potential use as electrolytes in Li-O-2 batteries was checked investigating Li/TEGDME-IL/O-2 cells by means of cycling voltammetry (CV) and galvanostatic charge-discharge tests. (C) The Author(s) 2014. Published by ECS. All rights reserved.