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Characterizations on the structural and electrochemical properties of LiNi1/3Mn1/3Co1/3O2 prepared by a wet-chemical process

Li, X. and Wei, Y. J. and Ehrenberg, Helmut and Du, F. and Wang, C. Z. and Chen, G. (2008):
Characterizations on the structural and electrochemical properties of LiNi1/3Mn1/3Co1/3O2 prepared by a wet-chemical process.
In: Solid State Ionics, pp. 1969-1974, 178, (39-40), ISSN 01672738, [Online-Edition: http://dx.doi.org/10.1016/j.ssi.2008.01.048],
[Article]

Abstract

LiNi1/3Mn1/3Co1/3O2 compounds were prepared at 700 (sample-A) and 900 °C (sample-B) by a simple wet-chemical process. X-ray diffraction showed the sample-A had a larger Li/Ni site exchange (9.9%) than that of the sample-B (4.4%). Raman scattering analysis suggests strong structural disorder within the octahedral [MO6] units due to different masses and bonding of the M–O bonds, as well as the Li/Ni site exchange in the crystals. The weakening of the Eg band was correlated with the Li/Ni site exchange. XPS analysis indicates that a lower annealing temperature than 900 °C leads to the formation of oxygen deficient LiNi1/3Mn1/3Co1/3O2 − δ. The electrochemical properties of the materials were investigated by charge–discharge experiments and electrochemical impedance spectroscopy. The drastic capacity fading of the sample-A was attributed to its structural properties. The sample-B showed satisfying cycling performance. But the capacity fading in the potential region of 2.5–4.6 V was larger than that in 2.5–4.4 V, which was attributed to the large charge transfer resistance at potentials above 4.4 V.

Item Type: Article
Erschienen: 2008
Creators: Li, X. and Wei, Y. J. and Ehrenberg, Helmut and Du, F. and Wang, C. Z. and Chen, G.
Title: Characterizations on the structural and electrochemical properties of LiNi1/3Mn1/3Co1/3O2 prepared by a wet-chemical process
Language: English
Abstract:

LiNi1/3Mn1/3Co1/3O2 compounds were prepared at 700 (sample-A) and 900 °C (sample-B) by a simple wet-chemical process. X-ray diffraction showed the sample-A had a larger Li/Ni site exchange (9.9%) than that of the sample-B (4.4%). Raman scattering analysis suggests strong structural disorder within the octahedral [MO6] units due to different masses and bonding of the M–O bonds, as well as the Li/Ni site exchange in the crystals. The weakening of the Eg band was correlated with the Li/Ni site exchange. XPS analysis indicates that a lower annealing temperature than 900 °C leads to the formation of oxygen deficient LiNi1/3Mn1/3Co1/3O2 − δ. The electrochemical properties of the materials were investigated by charge–discharge experiments and electrochemical impedance spectroscopy. The drastic capacity fading of the sample-A was attributed to its structural properties. The sample-B showed satisfying cycling performance. But the capacity fading in the potential region of 2.5–4.6 V was larger than that in 2.5–4.4 V, which was attributed to the large charge transfer resistance at potentials above 4.4 V.

Journal or Publication Title: Solid State Ionics
Volume: 178
Number: 39-40
Uncontrolled Keywords: Lithium–ion batteries; LiNi1/3Mn1/3Co1/3O2; X-ray diffraction; Raman scattering; Electrochemical properties
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B4: In situ investigations of the degradation of intercalation batteries and their modelling
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
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 15 Aug 2011 10:44
Official URL: http://dx.doi.org/10.1016/j.ssi.2008.01.048
Additional Information:

SFB 595 B4

Identification Number: doi:10.1016/j.ssi.2008.01.048
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