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Title: Synthesis, structure, and electrochemical performance of magnesium-substituted lithium manganese orthosilicate cathode materials for lithium-ion batteries
Authors: Gummow, RJ
Sharma, N
Peterson, VK
He, Y
Keywords: Neutron diffraction
X-ray diffraction
Lithium
Radioisotope Batteries
MAGNESIUM
Manganese Silicates
Issue Date: 1-Jan-2012
Publisher: Elsevier
Citation: Gummow, R. J., Sharma, N., Peterson, V. K., He, Y. (2012). Synthesis, structure, and electrochemical performance of magnesium-substituted lithium manganese orthosilicate cathode materials for lithium-ion batteries. Journal of Power Sources, 197, 231-237.
Abstract: Magnesium-substituted lithium manganese orthosilicate (Li2MnSiO4) cathode materials with a nominal composition of Li2MgxMn1−xSiO4, for x = 0.4 and 0.5 are synthesized by a solid-state route, at 700 Â°C in argon. The samples are characterized using powder X-ray and neutron diffraction, scanning electron microscopy, and galvanostatic cell-cycling. Rietveld analyses of the powder X-ray and neutron diffraction data show the formation of a monoclinic P21/n structure related to gamma lithium phosphate with no significant impurity peaks. This structure of the Mg-substituted samples is in contrast to the unsubstituted Li2MnSiO4 compound that has a Pmn21 structure when synthesized under the same conditions. Unit-cell volumes of the Mg-substituted materials are intermediate between those of the P21/n structure of Li2MnSiO4 and the isostructural low-temperature form of Li2MgSiO4, indicating the formation of a solid solution. The Mg-substituted materials feature mixed Mg/Mn cation sites, although no evidence of Li/Mn, Li/Mg or Li/Mg/Mn mixed sites are found. The Li2MgxMn1−xSiO4 cathodes show improved electrochemical performance over that reported for the unsubstituted Li2MnSiO4 P21/n phase. The Li2MgxMn1−xSiO4 cathode performance remains limited by its poor electronic properties and the large particle size of the solid-state synthesized products. Optimization of the synthesis conditions is likely to lead to enhanced electrochemical performance. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jpowsour.2011.09.013
http://apo.ansto.gov.au/dspace/handle/10238/4061
ISSN: 0378-7753
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