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Nanosized silver-coated and doped manganese dioxide for rechargeable lithium batteries

Abuzeid, Hanaa M. and Hashem, Ahmed M. and Narayanan, N. and Ehrenberg, Helmut and Julien, C. M. (2011):
Nanosized silver-coated and doped manganese dioxide for rechargeable lithium batteries.
In: Solid State Ionics, pp. 108-115, 182, (1), ISSN 01672738, [Online-Edition: http://dx.doi.org/10.1016/j.ssi.2010.11.023],
[Article]

Abstract

Nanosized pure, Ag-coated and doped manganese dioxides (MDO) were prepared through a redox reaction between KMnO4 and fumaric acid. XRD analysis showed cryptomelane crystal structure for pure, coated and doped α-phases. Chemical analysis detected the presence of silver in doped and coated MDO. Scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS) analyses confirmed the presence of silver in doped and coated oxides. Transmission electron microscope (TEM) images confirmed the nanosized particles of the prepared oxides. Magnetic measurements showed reduction in Mn3+ ions in the crystal structure after coating and doping with silver. The electrochemical performance showed that Ag-coated and doped MnO2 samples have better initial capacities than pristine MnO2. Ag-coated MnO2 material showed the best capacity retention upon cycling among all prepared MnO2 oxides, i.e. 140 mAh/g after the 40th cycle at C/5 rate in the potential window 1.5–4.0 V vs. Li/Li+.

Item Type: Article
Erschienen: 2011
Creators: Abuzeid, Hanaa M. and Hashem, Ahmed M. and Narayanan, N. and Ehrenberg, Helmut and Julien, C. M.
Title: Nanosized silver-coated and doped manganese dioxide for rechargeable lithium batteries
Language: English
Abstract:

Nanosized pure, Ag-coated and doped manganese dioxides (MDO) were prepared through a redox reaction between KMnO4 and fumaric acid. XRD analysis showed cryptomelane crystal structure for pure, coated and doped α-phases. Chemical analysis detected the presence of silver in doped and coated MDO. Scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS) analyses confirmed the presence of silver in doped and coated oxides. Transmission electron microscope (TEM) images confirmed the nanosized particles of the prepared oxides. Magnetic measurements showed reduction in Mn3+ ions in the crystal structure after coating and doping with silver. The electrochemical performance showed that Ag-coated and doped MnO2 samples have better initial capacities than pristine MnO2. Ag-coated MnO2 material showed the best capacity retention upon cycling among all prepared MnO2 oxides, i.e. 140 mAh/g after the 40th cycle at C/5 rate in the potential window 1.5–4.0 V vs. Li/Li+.

Journal or Publication Title: Solid State Ionics
Volume: 182
Number: 1
Uncontrolled Keywords: MnO2; Ag; Cathode; Lithium batteries
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 14:16
Official URL: http://dx.doi.org/10.1016/j.ssi.2010.11.023
Additional Information:

SFB 595 B4

Identification Number: doi:10.1016/j.ssi.2010.11.023
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