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Structural, Magnetic and Electrochemical Properties of the Spinel LiMn2-yCoyO4 Nanosized Powders

Published online by Cambridge University Press:  26 February 2011

Nourredine Amdouni ,
François Gendron ,
Alain Mauger  and
Christian M Julien
Nourredine Amdouni
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
François Gendron
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
Alain Mauger
Affiliation:
[email protected], CNRS, MPPU, 140 rue de Lourmel, Paris, 75015, France
Christian M Julien
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
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Abstract

We present the synthesis, structure, magnetic properties and electrode behaviour of LiMn2-yCoyO4 (0≤y≤0) spinel oxides prepared by the wet-chemitry via the carboxylic acid route. LiMn2-yCoyO4 samples crystallise with the cubic spinel-like structure (Fd3m S.G.). Optical spectra indicate that the vibrational mode frequencies and relative intensities of the bands are sensitive to the covalency of the (Co,Mn)-O bonds. Magnetic susceptibility and electron spin resonance measurements show the compositional dependence of the magnetic parameters, i.e. Curie temperature, Curie-Weiss constant and Néel temperature, when Mn is substituted by Co. The overall electrochemical capacity of LiMn2-yCoyO4 oxides have been reduced due to the 3d6 metal substitution, however, a more stable charge-discharge cycling performances have been observed when electrodes are charged up to 4.3 V as compared to the performance of the native oxide.

Keywords

intercalationsol-gelmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 973: Symposium BB – Mobile Energy , 2006 , 0973-BB04-04
Copyright
Copyright © Materials Research Society 2007

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