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In situ synchrotron diffraction study of high temperature prepared orthorhombic LiMnO2

Wei, Y. J. and Ehrenberg, Helmut and Bramnik, Natalia N. and Nikolowski, Kristian and Baehtz, Carsten and Fuess, Hartmut (2007):
In situ synchrotron diffraction study of high temperature prepared orthorhombic LiMnO2.
In: Solid State Ionics, pp. 253-257, 178, (3-4), ISSN 01672738,
[Online-Edition: http://dx.doi.org/10.1016/j.ssi.2006.11.018],
[Article]

Abstract

HT-LiMnO2 was prepared by a solid-state reaction at 900 °C. Electrochemical charge–discharge cycling of HT-LiMnO2 showed an initial charge capacity 113 mA h g− 1, followed by a small first discharge of 25 mA h g− 1. The discharge capacity subsequently increased and reached up to not, vert, similar 120 mA h g− 1 after 30 cycles. In situ synchrotron diffraction showed that HT-LiMnO2 transformed to a new phase (Phase II) during the first charge process, which was metastable and could easily convert to spinel LiMn2O4 in the following cycles. The progressive formation of this spinel phase was responsible for the capacity increase of the battery in the first cycles. The different cycling performance of HT-LiMnO2 and LT-LiMnO2 was attributed to the large stacking faults in LT-LiMnO2, which may facilitate the material to completely convert to spinel LiMn2O4 in the first charge without the medium transition to Phase II.

Item Type: Article
Erschienen: 2007
Creators: Wei, Y. J. and Ehrenberg, Helmut and Bramnik, Natalia N. and Nikolowski, Kristian and Baehtz, Carsten and Fuess, Hartmut
Title: In situ synchrotron diffraction study of high temperature prepared orthorhombic LiMnO2
Language: English
Abstract:

HT-LiMnO2 was prepared by a solid-state reaction at 900 °C. Electrochemical charge–discharge cycling of HT-LiMnO2 showed an initial charge capacity 113 mA h g− 1, followed by a small first discharge of 25 mA h g− 1. The discharge capacity subsequently increased and reached up to not, vert, similar 120 mA h g− 1 after 30 cycles. In situ synchrotron diffraction showed that HT-LiMnO2 transformed to a new phase (Phase II) during the first charge process, which was metastable and could easily convert to spinel LiMn2O4 in the following cycles. The progressive formation of this spinel phase was responsible for the capacity increase of the battery in the first cycles. The different cycling performance of HT-LiMnO2 and LT-LiMnO2 was attributed to the large stacking faults in LT-LiMnO2, which may facilitate the material to completely convert to spinel LiMn2O4 in the first charge without the medium transition to Phase II.

Journal or Publication Title: Solid State Ionics
Volume: 178
Number: 3-4
Uncontrolled Keywords: Orthorhombic LiMnO2; Lithium ion battery; Structural properties; In situ diffraction; Electrochemical properties
Divisions: 11 Department of Materials and Earth Sciences
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
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 > B - Characterisation > Subproject B3: Structure Characterization of Piezoelectric Ceramics With Respect to Electrical Fatigue
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
Date Deposited: 10 Aug 2011 11:42
Official URL: http://dx.doi.org/10.1016/j.ssi.2006.11.018
Additional Information:

SFB 595 Cooperation B3, B4

Identification Number: doi:10.1016/j.ssi.2006.11.018
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