Osmotic and activity coefficients for five lithium salts in three non–aqueous solvents

• Published in: The Journal of chemical thermodynamics Vol. 132; no. C; pp. 83 - 92
• Main Authors: Xin, Nan, Sun, Yanjun, Radke, Clayton J., Prausnitz, John M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01.05.2019; Elsevier
• Subjects: Activity coefficient; Archer–Pitzer equation; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Lithium salts; Non–aqueous solvents; Osmotic coefficient; Activity coefficient; Archer–Pitzer equation; Non–aqueous solvents; Lithium salts; Osmotic coefficient
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2018.12.016

Experimental osmotic coefficients for lithium salts in non–aqueous solvents: ■, LiBr in DMSO; ▪, LiCl in DMSO; ▪, LiNO3 in DMSO; ▪, LiBr in Acetonitrile; ▪, LiPF6 in Acetonitrile; ▪, LiTFSI in Acetonitrile; ▪, LiPF6 in DMC; ▪, LiTFSI in DMC. [Display omitted] •Osmotic coefficients of five lithium salts in three non–aqueous solvents were measured.•A literature review of activity coefficients for salts in non–aqueous solutions shows that experimental data are scarce.•Osmotic coefficients were correlated with three models.•Mean ionic activity coefficients were calculated with the Pitzer–Archer equation. 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 °C. Vapor–pressure lowering was measured for solutions containing a lithium salt (LiCl, 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.