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O: Fachverband Oberflächenphysik

O 121: Solid-Liquid Interface IV: Structure and Spectroscopy

O 121.10: Vortrag

Freitag, 20. März 2020, 13:00–13:15, TRE Phy

Bulk ion conductivity and near surface composition of Ionic Liquid and Zwitterion Ionic Liquid based electrolyte for sodium battery applications — •Thimo Brendel, Anna Dimitrova, and Stefan Krischok — Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, Germany

With this contribution we discuss the bulk ion conductivity, as well as the near surface chemical composition of ternary electrolytes containing Ionic Liquid (IL), sodium salt and Zwitterion Ionic Liquids (ZwIL). Two ILs and ZwIL are chosen: IL: 1-ethyl-3-methyl-imidazolium bis-(trifluoromethylsulfonyl)imide - [EMIm][Tf2N] and 1-butyl-1-methylpyrrolidinium bis-(trifluoromethylsulfonyl)imide - [Py1,4][Tf2N]; ZwIL: 3-(3-methylimidazolium-1-yl)Propane-1-sulfonate and 3-(3-vinylimidazolium-1-yl)Propane-1-sulfonate. As sodium precursor - bis(trifluoromethylsulfonyl) imide ([Na][Tf2N] was used. Different Na[Tf2N]/ZwIL ratios are considered and studied. By using Electrochemical Impedance Spectroscopy (EIS) and X-Ray Photoelectron Spectroscopy (XPS) we were able to measure the ion conductivity of the electrolytes in the temperature range 263K-323K and to determine the near surface chemical composition at UHV-conditions. The EIS results reveal that the presence of ZwILs enhances the ion conductivity, although they itself are not ion conductive. This implies to an ion decoupling in the other two electrolyte components. The XPS analysis displays a cation/anion/ZwIL (cation: [Py1,4]+, [EMIm]+, Na+; anion: [Tf2N])- distribution as depended on both: the concentration of Na[Tf2N] and the type of IL and ZwIL used.