Fingerle, Mathias ; Späth, Thomas ; Schulz, Natalia ; Hausbrand, René (2017)
Adsorption of ethylene carbonate on lithium cobalt oxide thin films: A synchrotron-based spectroscopic study of the surface chemistry.
In: Chemical Physics, 498-499
doi: 10.1016/j.chemphys.2017.09.004
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The surface chemistry of cathodic lithium cobalt oxide (LiCoO2) in contact with the Li-ion battery solvent ethylene carbonate (EC) was studied via synchrotron based soft X-ray photoelectron spectroscopy (SXPS). By stepwise in-situ adsorption of EC onto an rf-magnetron sputtered LiCoO2 thin film and consecutive recording of SXPS spectra, the chemical and electronic properties of the interface were determined. EC partially decomposes and forms a predominantly organic adlayer. Prolonged exposure results in the formation of a condensed EC layer, demonstrating that the decomposition layer has passivating properties. Lithium ions deintercalate from the electrode and are dissolved in the adsorbate phase, without forming a large amount of Li-containing reaction products, indicating that electrolyte reduction remains limited. Due to a large offset between the LiCoO2 valence band and the EC HOMO, oxidation of EC molecules is unlikely, and should require energy level shifts due to interaction or double layer effects for real systems.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Fingerle, Mathias ; Späth, Thomas ; Schulz, Natalia ; Hausbrand, René |
| Art des Eintrags: | Bibliographie |
| Titel: | Adsorption of ethylene carbonate on lithium cobalt oxide thin films: A synchrotron-based spectroscopic study of the surface chemistry |
| Sprache: | Englisch |
| Publikationsjahr: | 24 November 2017 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemical Physics |
| Jahrgang/Volume einer Zeitschrift: | 498-499 |
| DOI: | 10.1016/j.chemphys.2017.09.004 |
| URL / URN: | https://doi.org/10.1016/j.chemphys.2017.09.004 |
| Kurzbeschreibung (Abstract): | The surface chemistry of cathodic lithium cobalt oxide (LiCoO2) in contact with the Li-ion battery solvent ethylene carbonate (EC) was studied via synchrotron based soft X-ray photoelectron spectroscopy (SXPS). By stepwise in-situ adsorption of EC onto an rf-magnetron sputtered LiCoO2 thin film and consecutive recording of SXPS spectra, the chemical and electronic properties of the interface were determined. EC partially decomposes and forms a predominantly organic adlayer. Prolonged exposure results in the formation of a condensed EC layer, demonstrating that the decomposition layer has passivating properties. Lithium ions deintercalate from the electrode and are dissolved in the adsorbate phase, without forming a large amount of Li-containing reaction products, indicating that electrolyte reduction remains limited. Due to a large offset between the LiCoO2 valence band and the EC HOMO, oxidation of EC molecules is unlikely, and should require energy level shifts due to interaction or double layer effects for real systems. |
| Freie Schlagworte: | XPS,LiCoO2,Ethylene carbonate,SEI, Li-ion battery, Ionic interface |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 27 Sep 2017 08:08 |
| Letzte Änderung: | 10 Sep 2020 09:04 |
| PPN: | |
| Sponsoren: | We thank HZB for the allocation of synchrotron radiation beamtime and for financial support., This project was funded by the DFG (HA 6128/1-1). |
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