The 4,5-dicyano-2-trifluoromethyl-imidazolide (TDI-) anion is a potential lithium salt anion for lithium-ion batteries. In this paper the transport properties of LiTDI solutions in EC/DMC (50/50wt%) are compared to competing salts such as LiTFSI (lithium bis(trifluoromethylsulfonyl) imide), LiFAP (lithium tris(pentafluoroethane)-trifluorophosphate) and the most commonly used LiPF6 (lithium hexafluorophosphate). LiTDI in EC/DMC exhibits the lowest viscosity among the investigated electrolytes, but also the lowest conductivity: 6.84 mS cm(-1) at 25 degrees C (1 mol L-1). The self-diffusion coefficients (D(Li-7) and D (F-19)) determined by observing Li-7 and F-19 nuclei with the pulsed-gradient spin-echo (PGSE) NMR technique allowed access, through application of the Stokes-Einstein and Nernst-Einstein equations, to the lithium transference number (t(+)), the effective ionic radius and the ionic dissociation coefficient (alpha(D)) of LiTDI in EC/DMC. The ion-pair dissociation and t(+) were also determined using conductivity and viscosity measurements and by following the Bruce-Vincent method respectively and were in good agreement with those obtained by PGSE-NMR. LiTDI displays in EC/DMC a cationic transference number t(+)=0.58, which is higher than that of LiPF6 in the same solvent mixture, meaning that the mobility of the PF6- anion is higher than the larger TDI- anion. Still, results from both methods indicate that, LiTDI, as many other lithium salts is only partially dissociated in EC/DMC. Only 31% of the ion pairs are dissociated at 25 degrees C whereas for LiPF6, LiTFSI and LiFAP this number reaches at least 64% in 1 mol L-1 solutions. (C) 2015 Published by Elsevier Ltd.