Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 38: Organic-Inorganic Hybrid Systems and Organic Films V
O 38.7: Vortrag
Dienstag, 21. März 2017, 15:45–16:00, WIL A317
Interaction of an Ionic Liquid Adlayer with Li4Ti5O12 and Influence of Pre- and Post-deposited Lithium - A Model Study of the Electrode|Electrolyte Interface — •Jihyun Kim1, Florian Buchner2, and R. Jürgen Behm1,2 — 1Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89081 Ulm, Germany
Well-defined spinel lithium-titanium-oxide, Li4Ti5O12 (111), which is a promising anode material for a lithium-ion batteries, was generated by a solid state reaction (LiOH + TiO2 (111)) and its crystallinity and stoichiometry were confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. To mimic the electrode|electrolyte interface (EEI) (crucial for the battery performance), we vapor deposited a monolayer of the battery-relevant ionic liquid (solvent/electrolyte) 1-butyl-1-methyl-pyrrolidinium bis(tri-fluoro-methyl-sulfonyl)amide ([BMP][TFSA]) on Li4Ti5O12 (111) at 300 K. XPS reveals that [BMP][TFSA] is partially decomposed, forming products such as LiF, LixS, LixSO, SOx and LiN3. Post-deposition of 1 ML of Li on a ([BMP][TFSA]) adlayer at 300 K increases the amount of decomposition products in the adlayer. After pre-deposition of 1 ML of Li on pristine Li4Ti5O12 (111) at 300 K, XP spectra reveal that lithium diffuses (intercalates) into the bulk, most likely forming a Li-rich LixTi5O12 (4<x<7) phase. Future work will concentrate on the interaction of [BMP][TFSA] with both the Li-poor (Li4Ti5O12) and the Li-rich (LixTi5O12) phases in different temperature ranges.