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O: Fachverband Oberflächenphysik

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

O 121.9: Vortrag

Freitag, 20. März 2020, 12:45–13:00, TRE Phy

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

In this contribution we focus on the bulk conductivity and the near surface composition of several tertiary electrolytes, which consist of Ionic Liquid (IL), Zwitterion Ionic Liquid (ZwIL) and a Li salt. 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 lithium precursor - bis(trifluoromethylsulfonyl)imide - Li[Tf2N] was used. Different Li[Tf2N]/ZwIL ratios are considered and studied. Electrochemical Impedance Spectroscopy (EIS) enables us to determine the ion conductivity of the electrolyte. The results reveal that the presence of ZwILs enhances the ion conductivity, although they itself are not ion conductive. Further, by using X-Ray Photoelectron Spectroscopy (XPS) we analyze the near surface chemical composition at UHV-conditions. The XPS analysis displays a cation/anion/ZwIL distribution as depended on the concentration of Na[Tf2N] and the type of IL and ZwIL used. The spectroscopic results revealed solute-solvent interactions which modify the ion mobility.