Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Solid-liquid interfaces: Structure, Spectroscopy II
O 60.2: Vortrag
Mittwoch, 14. März 2018, 10:45–11:00, MA 144
The Ionic Liquid|Graphite and Lithiated Graphite Interface - A Model Study for the Solid|Electrolyte Interphase in Li-ion Batteries — •Florian Buchner1,2, Jihyun Kim2, Katrin Forster-Tonigold1, Isabella Weber2, Johannes Schnaidt1, Joachim Bansmann2, Axel Gross3, and R. Jürgen Behm1,2 — 1Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89081 Ulm, Germany — 2Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 3Ulm University, Institute of Theoretical Chemistry, D-89069 Ulm, Germany
Here we report results of a UHV study on the interaction of an Ionic Liquid (IL) with graphite(0001) as a model study for the solid|electrolyte interphase (SEI) in Li-ion batteries. The interaction of mono- and multilayers of the battery-relevant IL 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide [BMP][TFSI] with pristine/lithiated graphite was investigated, employing X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS) and dispersion corrected density functional calculations (DFT-D). The measurements reveal that intact ion pairs adsorb on graphite, while deposition on lithiated graphite at 300 K (>230 K) leads to instantaneous deintercalation of Li+. In general, contact of the IL with Li, either after deintercalation from lithiated graphite or after deposition from the vacuum side, results in the decomposition of the IL adlayer (Li3N, Li2S, etc.). The decomposition is different for multilayers. We will also compare the observed products with that in the electrochemical SEI in [Li][TFSI]/[BMP][TFSI].