Phase diagrams of lithium salt systems in dimethyl sulfoxide, propylene carbonate and dimethyl carbonate have been obtained and conductivity measurements have been performed in the concentration range up to 0.25mole fraction of a salt. The shape of the phase diagrams has been analyzed thermodynamically and the following order of anions for decreasing association of salts with DMSO at c LiX =0.2 has been suggested, ClO 4 − >CF 3 SO 3 − >BF 4 − >NO 3 − . The eutectic-type phase diagrams of the LiClO 4 -PC and LiClO 4 -DMC systems correspond to ideal, non-interacting solutions. The conductivity isotherms for the DMSO solutions at c LiX =0.2 are arranged in the order of increasing conductivity as CF 3 SO 3 − <ClO 4 − <B(C 2 O 4 ) 2 − <BF 4 − <NO 3 − , N(SO 3 CF 3 ) 2 − . This order looks very similar to that for decreasing association of salts with DMSO signifying that both phase diagrams and conductivity are sensitive to all types of association equilibria and account for both solvation and ion pairing phenomena. For the solutions of LiClO 4 in DMSO, PC and DMC at cLiClO4=0.5–1mole fraction of the salt, the order of solvents for increasing conductivity is DMC<PC<<DMSO and possibly reflects extended ion pairing in ideal, non-interacting PC and DMC solutions.