To obtain osmotic coefficients, a classic static-view apparatus was used to measure the difference between the vapor pressure of a solvent and that of its salt solution at 25 degrees C. Vapor-pressure lowering was measured for solutions containing a lithium salt (LiCI, LiBr, LiNO3, LiPF6 and LITFSI) dissolved in a non-aqueous solvent (dimethyl carbonate, dimethyl sulfoxide and acetonitrile) that may be used in a lithium-ion battery. The osmotic-coefficient data are represented by Archer's extended Pitzer equation. Mean ionic activity coefficients for the salts are calculated from the osmotic-coefficient data. (C) 2018 Elsevier Ltd.