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SEI Formation on TiO2 Rutile

Pfanzelt, M. ; Kubiak, P. ; Jacke, S. ; Dimesso, L. ; Jaegermann, W. ; Wohlfahrt-Mehrens, M. (2012):
SEI Formation on TiO2 Rutile.
In: Journal of The Electrochemical Society, 159 (6), pp. A809-A814. The Electrochemical Society, ISSN 00134651,
[Article]

Abstract

X-ray photoelectron spectroscopy (XPS) and symmetric electrochemical impedance spectroscopy (EIS) are carried out to identify and determine the nature of the solid electrolyte interface (SEI) formation on TiO2 rutile anodes in lithium ion batteries. The recorded XPS spectra (O1s, C1s, P2p and Li1s and Ti2p) evidence an SEI layer formation at 0.8 V vs. Li/Li+ in a TiO2/Li cell with a lithium reference and an organic electrolyte (LiPF6 in EC : DMC (1 : 1 by wt%)). When the cell is discharged down to 0.1 V, the SEI mainly consists of ether and carbonyl groups and some alcohol or alkoxide groups. Upon charge the SEI additionally evidences some carboxylic groups. EIS measurements exhibit an additional RQ element at 0.8 V, supporting the formation of the SEI at this potential. The EIS evaluation shows that the SEI is mainly formed in the first cycle but evolves further on in the following cycles.

Item Type: Article
Erschienen: 2012
Creators: Pfanzelt, M. ; Kubiak, P. ; Jacke, S. ; Dimesso, L. ; Jaegermann, W. ; Wohlfahrt-Mehrens, M.
Title: SEI Formation on TiO2 Rutile
Language: English
Abstract:

X-ray photoelectron spectroscopy (XPS) and symmetric electrochemical impedance spectroscopy (EIS) are carried out to identify and determine the nature of the solid electrolyte interface (SEI) formation on TiO2 rutile anodes in lithium ion batteries. The recorded XPS spectra (O1s, C1s, P2p and Li1s and Ti2p) evidence an SEI layer formation at 0.8 V vs. Li/Li+ in a TiO2/Li cell with a lithium reference and an organic electrolyte (LiPF6 in EC : DMC (1 : 1 by wt%)). When the cell is discharged down to 0.1 V, the SEI mainly consists of ether and carbonyl groups and some alcohol or alkoxide groups. Upon charge the SEI additionally evidences some carboxylic groups. EIS measurements exhibit an additional RQ element at 0.8 V, supporting the formation of the SEI at this potential. The EIS evaluation shows that the SEI is mainly formed in the first cycle but evolves further on in the following cycles.

Journal or Publication Title: Journal of The Electrochemical Society
Journal volume: 159
Number: 6
Publisher: The Electrochemical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 25 Nov 2013 09:51
Official URL: http://dx.doi.org/10.1149/2.085206jes
Additional Information:

This was Paper 607 presented at the Montreal, QC, Canada, Meeting of the Society, May 1–6, 2011.

Identification Number: doi:10.1149/2.085206jes
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