Ionic liquids (IL) composed of a quaternary ammonium cation having an ether chain, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium (DEME) are electrochemically stable and used in electric double layer capacitors and also one of important candidates to use lithium secondary batteries. In this study, three DEME-based ILs with anions BF4, CF3BF3, and N(SO2CF3)(2) were studied by measuring temperature dependences of ionic conductivity sigma, viscosity eta and density rho. Also ion diffusion coefficients D-anion and D-cation were obtained by NMR spectroscopy in the wide temperature range. Using the classical Stokes-Einstein (SE) and Nernst-Einstein (NE) equations, the relationships between eta and D, and sigma and D were evaluated. The lithium salt doping effects were studied by Li-7 NMR spectroscopy. The lithium ion diffusion was slower than other ion diffusion at every temperature. Arrhenius-type plots of Li-7 T-1 showed minima in the three doped samples. Then one-jump distance of lithium ion was estimated in the temperature range between 273 and 373 K.