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Fatigue Process in Li-Ion Cells: An In Situ Combined Neutron Diffraction and Electrochemical Study

Dolotko, O. and Senyshyn, Anatoliy and Mühlbauer, M. J. and Nikolowski, Kristian and Scheiba, Frieder and Ehrenberg, Helmut (2012):
Fatigue Process in Li-Ion Cells: An In Situ Combined Neutron Diffraction and Electrochemical Study.
In: Journal of the Electrochemical Society, pp. A2082-A2088, 159, (12), ISSN 0013-4651, [Online-Edition: http://dx.doi.org/10.1149/2.080212jes],
[Article]

Abstract

In situ high-resolution neutron powder diffraction along with electrochemical analysis was applied to study fatigue processes in commercial LiCoO2 (18650-type, 2600 mAh, 3.0–4.2 V) cells. The Rietveld refinement technique was successfully applied for structural characterization of the cell materials as function of fatigue introduced. The capacity loss determined from the electrochemical investigation has been found proportional to the number of cycles, which the cell underwent, and was 21.9% and 12.8% for the cell cycled for 1000 times at 25◦C and 50◦C, respectively. This capacity fade has a close correlation to the structural changes in cathode and anode materials with the cell fatigue.Achange of the lithium occupation and lattice parameters of the LixCoO2 were observed with proceeding battery fatigue. Transformation of the graphitic anode into LiC6 and LiC12 was identified after the batteries were fully charged. Their weight ratio was found to be dependent on the number of executed cycles. It was concluded that loss of the active lithium in both cathode and anode as well as microstructure changes on the anode side are important factors for the battery degradation. A favorable influence of the elevated cycling temperature on the battery performance was observed.

Item Type: Article
Erschienen: 2012
Creators: Dolotko, O. and Senyshyn, Anatoliy and Mühlbauer, M. J. and Nikolowski, Kristian and Scheiba, Frieder and Ehrenberg, Helmut
Title: Fatigue Process in Li-Ion Cells: An In Situ Combined Neutron Diffraction and Electrochemical Study
Language: English
Abstract:

In situ high-resolution neutron powder diffraction along with electrochemical analysis was applied to study fatigue processes in commercial LiCoO2 (18650-type, 2600 mAh, 3.0–4.2 V) cells. The Rietveld refinement technique was successfully applied for structural characterization of the cell materials as function of fatigue introduced. The capacity loss determined from the electrochemical investigation has been found proportional to the number of cycles, which the cell underwent, and was 21.9% and 12.8% for the cell cycled for 1000 times at 25◦C and 50◦C, respectively. This capacity fade has a close correlation to the structural changes in cathode and anode materials with the cell fatigue.Achange of the lithium occupation and lattice parameters of the LixCoO2 were observed with proceeding battery fatigue. Transformation of the graphitic anode into LiC6 and LiC12 was identified after the batteries were fully charged. Their weight ratio was found to be dependent on the number of executed cycles. It was concluded that loss of the active lithium in both cathode and anode as well as microstructure changes on the anode side are important factors for the battery degradation. A favorable influence of the elevated cycling temperature on the battery performance was observed.

Journal or Publication Title: Journal of the Electrochemical Society
Volume: 159
Number: 12
Uncontrolled Keywords: PLZT; Reduction treatment; Hydrogen defects; Oxygen acancies
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > T - Transfer projects > Subproject T1: in operando“ studies of materials fatigue in commercial battery-types by neutron tomography and diffraction
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > T - Transfer projects
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 23 Oct 2012 10:28
Official URL: http://dx.doi.org/10.1149/2.080212jes
Additional Information:

SFB 595 T1

Identification Number: doi:10.1149/2.080212jes
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