Effect of Nitrile-Functionalization of Imidazolium-Based Ionic Liquids on Their Transport Properties, Both Pure and Mixed with Lithium Salts.

Hassan Srour (1, 2) , Mounir Traïkia (3) , Bernard Fenet (1) , Hélène Rouault (2) , Margarida F. Costa Gomes (3) , Catherine C. Santini (1) , Pascale Husson (3)

1 C2P2 - Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265
2 CEA LITEN/DEHT/LCPEM - Institut LITEN
3 ICCF - Institut de Chimie de Clermont-Ferrand

The influence of the presence of a nitrile group in the cation of imidazolium-based ionic liquids on their transport properties was investigated. As these liquids can be used as electrolytes in lithium ion batteries, their mixtures with lithium salts were also considered. 1-Butyl-3-methylimidazolium bis(trifluoromethylsulphonyl)imide, [C1C4Im][NTf2], 1-butylnitril-3-methylimidazolium bis(trifluoromethylsulphonyl)imide, [C1C3CNIm][NTf2], and their mixtures with bis(trifluoromethylsulphonyl)imide lithium, Li[NTf2], were studied. Their mass transport properties (viscosity, ionic conductivity, self-diffusion) were experimentally determined. NMR spectroscopy was also used to explore molecular organization and interactions in these systems. The addition of a cyano group increases the viscosity and the ionicity of the liquid. The effect of lithium ion is more pronounced on [C1C3CNIm][NTf2], with interactions between Li+ and the nitrile group.

Mots clés: Viscosity; Conductivity; Diffusion; Ionicity; NMR spectroscopy; Lithium; Nitrile-functionalization; Ionic liquids

Domaines: Chimie

Hassan Srour, Mounir Traïkia, Bernard Fenet, Hélène Rouault, Margarida F. Costa Gomes, et al.. Effect of Nitrile-Functionalization of Imidazolium-Based Ionic Liquids on Their Transport Properties, Both Pure and Mixed with Lithium Salts.. Journal of Solution Chemistry, 2015, 44 (3-4), pp.495-510. ⟨10.1007/s10953-014-0280-2⟩. ⟨hal-01213424⟩