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Electrical and Esr Studies of Lithium Manganese Oxide Spinels

Published online by Cambridge University Press:  10 February 2011

C. Julien ,
F. Gendron ,
S. Ziolkiewicz  and
G.A. Nazri
C. Julien
Affiliation:
Laboratoire des Milieux Désordonnés et Hétérogénes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris 05, France
F. Gendron
Affiliation:
Laboratoire des Milieux Désordonnés et Hétérogénes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris 05, France
S. Ziolkiewicz
Affiliation:
Laboratoire des Milieux Désordonnés et Hétérogénes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris 05, France
G.A. Nazri
Affiliation:
Physics and Physical Chemistry Department, RCEL, General Motors R&D Center, Warren, MI 48090, USA
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Abstract

We report electrical properties of the lithium manganospinel LiMn2 O 4 and its delithiated/lithiated forms, Li1−x−∂Mn2−∂O4 with 0.0≤x≤0.4 and 0.00≤∂0.18. The electrical conductivity has been determined from d.c. measurements as a function of temperature and lithium content in the host lattice. LiMn2O4 exhibits a phase transition in the vicinity of 280 K, which disappears in the lithium-rich samples. Electrical data are analysed using the model of small-polaron transport. ESR spectroscopy has been applied to identify the singular structural features. Investigations as a function of temperature show a reliable determination of the modifications in the cationic sublattice and of the lithium overstoichiometry. The hopping conductivity mechanism between the Mn3+ and Mn4+ sites gives a coherent explanation for the observed ESR signal of cyclotron resonance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 187
Copyright
Copyright © Materials Research Society 1999

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References

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