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Electrolytic V2O5: Synthesis, Characterization and Lithium Insertion Behavior

Published online by Cambridge University Press:  10 February 2011

E. Potiron ,
A. Le Galla Salle ,
A. Verbaere ,
Y Piffard  and
D. Guyomard
E. Potiron
Affiliation:
Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, UMR CNRS-University of Nantes n° 6502. 2, rue de la Houssinière - BP 32229 - 44322 Nantes Cedex 3, France.
A. Le Galla Salle
Affiliation:
Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, UMR CNRS-University of Nantes n° 6502. 2, rue de la Houssinière - BP 32229 - 44322 Nantes Cedex 3, France.
A. Verbaere
Affiliation:
Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, UMR CNRS-University of Nantes n° 6502. 2, rue de la Houssinière - BP 32229 - 44322 Nantes Cedex 3, France.
Y Piffard
Affiliation:
Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, UMR CNRS-University of Nantes n° 6502. 2, rue de la Houssinière - BP 32229 - 44322 Nantes Cedex 3, France.
D. Guyomard
Affiliation:
Institut des Matériaux de Nantes, Laboratoire de Chimie des Solides, UMR CNRS-University of Nantes n° 6502. 2, rue de la Houssinière - BP 32229 - 44322 Nantes Cedex 3, France.
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Abstract

Electrolytic V2O5 materials were prepared by electrochemical oxidation of vanadyl ions in aqueous solution. The electrodeposition reaction includes two steps: an oxidation into soluble species followed by a precipitation. With the use of various electrodeposition conditions and subsequent heat treatment it is possible to obtain e-V2O5 compounds with different VIV and water contents.

e-V2O5 compounds are mixed valence, hydrated vanadic acids and their formula can be written as H0.4V2O5.2−δ.nH2 with 0.04<8<0.22 and 0<n<1.8. These poorly crystallized layered compounds undergo a phase transformation into α-V2O5 starting at 240°C.

The electrochemical intercalation of lithium into these compounds shows two main single phase phenomena at ≈3.2V/Li and ≈2.6V/Li. Their capacity retention is better than that of other V2O5 reference compounds, but the reversible capacity down to 2V is only ≈100Ah/kg at a rate faster than C/5, due to kinetic limitations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 31
Copyright
Copyright © Materials Research Society 2000

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References

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