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Dehydration and Lithium Insertion Studies in Phyllomanganates

Published online by Cambridge University Press:  25 February 2011

Pierre Strobel
Pierre Strobel*
Affiliation:
Laboratoire de Cristallographie C.N.R.S., associé à l'Université J. Fourier, BP 166X, 38042 Grenoble Cedex 09, France
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Abstract

Layered oxides AxMnO≈2,yH20 (A = Na, K, NH4, Cs or Mn2+) have been dehydrated and intercalated by lithium. Dehydration is accompanied by a shrinking of the interlayer space height depending on the size of A. The valence of Mn is reduced to +2 by reaction with n-butyllithium. Electrochemical studies of cells AxMnO≈2-graphite | LiClO4-PC|I Li showed two main reaction peaks at ca. 3V and below 2 V. The first reaction is a reversible reduction to a disordered Mn3+ phased. Capacities at the third cycle are ca. 300 Wh/kg. No marked difference was found as a function of A or of the degree of order of the starting compound.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992, 63
Copyright
Copyright © Materials Research Society 1993

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