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Improvement of the electrochemical performance of nanosized α-MnO2 used as cathode material for Li-batteries by Sn-doping

Hashem, Ahmed M. and Abdel-Latif, A. M. and Abuzeid, Hanaa M. and Abbas, H. M. and Ehrenberg, Helmut and Farag, R. S. and Mauger, A. and Julien, C. M. (2011):
Improvement of the electrochemical performance of nanosized α-MnO2 used as cathode material for Li-batteries by Sn-doping.
In: Journal of Alloys and Compounds, pp. 9669-9674, 509, (40), ISSN 09258388, [Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2011.07.075],
[Article]

Abstract

Sn-doped MnO2 was prepared by hydrothermal reaction between KMnO4 as oxidant, fumaric acid C4H4O4 as reductant and SnCl2 as doping agent. XRD analysis indicates the cryptomelane α-MnO2 crystal structure for pure and doped samples. Thermal stabilization was observed for both oxides as detected from thermogravimetric analysis. SEM and TEM images show changes in the morphology of the materials from spherical-like particles for pristine P–MnO2 to rod-like structure for Sn–MnO2. Electrochemical properties of the electrode materials have been tested in lithium cells. Improvement in capacity retention and cycling ability is observed for doped oxide at the expense of initial capacity. After 35 cycles, the Li//Sn doped MnO2 cell display lower capacity loss.

Item Type: Article
Erschienen: 2011
Creators: Hashem, Ahmed M. and Abdel-Latif, A. M. and Abuzeid, Hanaa M. and Abbas, H. M. and Ehrenberg, Helmut and Farag, R. S. and Mauger, A. and Julien, C. M.
Title: Improvement of the electrochemical performance of nanosized α-MnO2 used as cathode material for Li-batteries by Sn-doping
Language: English
Abstract:

Sn-doped MnO2 was prepared by hydrothermal reaction between KMnO4 as oxidant, fumaric acid C4H4O4 as reductant and SnCl2 as doping agent. XRD analysis indicates the cryptomelane α-MnO2 crystal structure for pure and doped samples. Thermal stabilization was observed for both oxides as detected from thermogravimetric analysis. SEM and TEM images show changes in the morphology of the materials from spherical-like particles for pristine P–MnO2 to rod-like structure for Sn–MnO2. Electrochemical properties of the electrode materials have been tested in lithium cells. Improvement in capacity retention and cycling ability is observed for doped oxide at the expense of initial capacity. After 35 cycles, the Li//Sn doped MnO2 cell display lower capacity loss.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 509
Number: 40
Uncontrolled Keywords: Lithium ion batteries; Manganese dioxide; Tin doping; Cryptomelane
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 Sep 2011 14:13
Official URL: http://dx.doi.org/10.1016/j.jallcom.2011.07.075
Additional Information:

SFB 595 B4

Identification Number: doi:10.1016/j.jallcom.2011.07.075
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