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Raman diagnostics of LiCoO2 electrodes for lithium-ion batteries

Gross, Toni André and Hess, Christian (2014):
Raman diagnostics of LiCoO2 electrodes for lithium-ion batteries.
In: Journal of Power Sources, pp. 220-225, 256, ISSN 03787753, [Online-Edition: http://dx.doi.org/10.1016/j.jpowsour.2014.01.084],
[Article]

Abstract

LiCoO2 based electrode materials were characterized in detail using visible Raman spectroscopy. The studied materials comprise the active LiCoO2 material itself as well as electrochemically relevant composites of LiCoO2 with binder and conductive additives. Spatially resolved analysis, i.e. mapping of LiCoO2 composite electrodes reveals a significant variation of chemical composition across the electrode surface. Based on wavelength-dependent studies we demonstrate the presence of a resonance enhancement for LiCoO2 materials for green laser excitation allowing for in situ studies on the LiCoO2-based electrodes during lithium de-intercalation. During in situ experiments no significant structural changes occur consistent with the fact that visible Raman spectroscopy probes mainly the surface region of the LiCoO2 composite electrode. Our results demonstrate the potential of Raman spectroscopy for spatially resolved and in situ analysis of lithium-ion batteries.

Item Type: Article
Erschienen: 2014
Creators: Gross, Toni André and Hess, Christian
Title: Raman diagnostics of LiCoO2 electrodes for lithium-ion batteries
Language: English
Abstract:

LiCoO2 based electrode materials were characterized in detail using visible Raman spectroscopy. The studied materials comprise the active LiCoO2 material itself as well as electrochemically relevant composites of LiCoO2 with binder and conductive additives. Spatially resolved analysis, i.e. mapping of LiCoO2 composite electrodes reveals a significant variation of chemical composition across the electrode surface. Based on wavelength-dependent studies we demonstrate the presence of a resonance enhancement for LiCoO2 materials for green laser excitation allowing for in situ studies on the LiCoO2-based electrodes during lithium de-intercalation. During in situ experiments no significant structural changes occur consistent with the fact that visible Raman spectroscopy probes mainly the surface region of the LiCoO2 composite electrode. Our results demonstrate the potential of Raman spectroscopy for spatially resolved and in situ analysis of lithium-ion batteries.

Journal or Publication Title: Journal of Power Sources
Volume: 256
Uncontrolled Keywords: Lithium-ion batteries; LiCoO2; In situ Raman spectroscopy; Spatially-resolved analysis; Resonance Raman
Divisions: 07 Department of Chemistry > Physical Chemistry
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B8: In situ diagnostics of intercalation-batteries via Raman spectroscop
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
07 Department of Chemistry
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 28 Apr 2014 10:58
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2014.01.084
Additional Information:

SFB 595 B8

Identification Number: doi:10.1016/j.jpowsour.2014.01.084
Funders: This work was supported by SFB595 of the Deutsche Forschungsgemeinschaft (DFG). The authors thank Lars Giebeler and Julia Eigenseer for help with some of the Raman experiments and Karl Kopp for technical support. We like to thank Wolfgang Donner for the o
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