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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.4: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

On the adsorption behavior of the ionic liquid [BMP][TFSA] on TiO2 (110), Cu(111) and Ag(111) and the interaction with Li — •Maral Hekmatfar1,2, Benedikt Uhl1, 2, Florian Buchner1, 2, Dorothea Alwast1, 2, and R. Jürgen Behm1, 21Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany

The ionic liquid n-butyl-n-methylpyrrolidinium-bis(trifluoromethylsulfonyl)imide [BMP][TFSA] is particularly interesting for the application in electrolytes for Li-ion batteries. In this model study we aim at a detailed understanding of the electrode|electrolyte interface at the molecular scale. In a first step [BMP][TFSA] was vapor deposited on Cu(111), Ag(111) and TiO2(110) under ultra-high vacuum conditions. At 80 K [BMP][TFSA] adsorbs intact on all surfaces which was verified by XPS measurements; different molecular arrangements were observed by STM, which will be discussed. Upon co-deposition of Li to mimic electrolyte, decomposition of mainly the anion into, e.g., LiF and Li2S was found on Cu(111) even at 80 K, while on Ag(111) and TiO2 the IL is little or nearly not affected. Interestingly, on TiO2(110) a new Ti3+ species is observed in the Ti 2p region, which points toward the reaction of Li with the surface. In contrast, on Cu(111) we assume that a surface mediated decomposition of [BMP][TFSA] with Li takes place. As the electrode|electrolyte interface strongly determines the functionality of a battery, we believe that our model study gives very new insights.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin