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Defect Spinels in the System Li—Mn—O. Chemistry and Lithium Insertion

Published online by Cambridge University Press:  16 February 2011

F. Le Cras
Affiliation:
Lab. de Cristallographie, CNRS, BP 166, 38042 Grenoble Cedex 9, France Lab. d'Application de l'Electrochimie, CEA/CEREM, 38054 Grenoble Cedex 9, France
D. Bloch
Affiliation:
Lab. d'Application de l'Electrochimie, CEA/CEREM, 38054 Grenoble Cedex 9, France
M. Anne
Affiliation:
Lab. de Cristallographie, CNRS, BP 166, 38042 Grenoble Cedex 9, France
P. Strobel
Affiliation:
Lab. de Cristallographie, CNRS, BP 166, 38042 Grenoble Cedex 9, France
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Abstract

Spinel phases Li-Mn-C with Li/Mn ratios between 0.35 and 0.8 were synthesized. The relationships between composition, manganese valence, vacancy fraction and electrochemical capacity are described using a new composition-valence phase diagram. Electrochemical performances in lithium batteries are compared. The best materials showed constant capacit> 140 Ah/kg in the range 3.5/2 V in liquid electrolyte batteries up to 20 cycles, without the usual capacity drop observed in stoichiometric LiMn204.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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