Becker, Dirk ; Cherkashinin, Gennady ; Hausbrand, René ; Jaegermann, Wolfram (2014)
Adsorption of Diethyl Carbonate on LiCoO2 Thin Films: Formation of the Electrochemical Interface.
In: The Journal of Physical Chemistry C, 118 (2)
doi: 10.1021/Jp405714x
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Despite numerous efforts to elucidate interface-related phenomena of Li ion battery cathodes, the exact nature of cathode/electrolyte interfaces is still not fully resolved. Key factors for the properties of semiconducting ionic electrodes are band bending and energy level alignment at the interface, which have not been given much attention in the past. In this contribution, we investigate the formation of the electrochemical interface for a LiCoO2 electrode in contact with a solvent adsorbate phase by a surface science approach. Diethyl carbonate (DEC) was adsorbed stepwise onto a LiCoO2 thin film electrode and the electrode surface analyzed with X-ray photoelectron spectroscopy (XPS) after each adsorption step. Adsorption results in the formation of a charged layer in the electrode, which we attribute to the transfer of lithium ions from the electrode to the adsorbed phase. The offset between the LiCoO2 valence band and HOMO of the adsorbed DEC is large (4 eV) under the experimental conditions, which renders solvent oxidation unlikely.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Becker, Dirk ; Cherkashinin, Gennady ; Hausbrand, René ; Jaegermann, Wolfram |
| Art des Eintrags: | Bibliographie |
| Titel: | Adsorption of Diethyl Carbonate on LiCoO2 Thin Films: Formation of the Electrochemical Interface |
| Sprache: | Englisch |
| Publikationsjahr: | 16 Januar 2014 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 118 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1021/Jp405714x |
| Kurzbeschreibung (Abstract): | Despite numerous efforts to elucidate interface-related phenomena of Li ion battery cathodes, the exact nature of cathode/electrolyte interfaces is still not fully resolved. Key factors for the properties of semiconducting ionic electrodes are band bending and energy level alignment at the interface, which have not been given much attention in the past. In this contribution, we investigate the formation of the electrochemical interface for a LiCoO2 electrode in contact with a solvent adsorbate phase by a surface science approach. Diethyl carbonate (DEC) was adsorbed stepwise onto a LiCoO2 thin film electrode and the electrode surface analyzed with X-ray photoelectron spectroscopy (XPS) after each adsorption step. Adsorption results in the formation of a charged layer in the electrode, which we attribute to the transfer of lithium ions from the electrode to the adsorbed phase. The offset between the LiCoO2 valence band and HOMO of the adsorbed DEC is large (4 eV) under the experimental conditions, which renders solvent oxidation unlikely. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 27 Feb 2015 09:57 |
| Letzte Änderung: | 29 Mär 2015 16:28 |
| PPN: | |
| Sponsoren: | The authors wish to acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG) and the Federal Ministry of Education and Research (BMBF, Support Code 03KP801). |
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