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Structural study of lithium insertion in vanadium oxides used as cathode materials

Published online by Cambridge University Press:  10 February 2011

Patrick Rozier ,
Jean Michel Savariault  and
Jean Galy
Patrick Rozier
Affiliation:
CEMES CNRS; 29, rue Jeanne MARVIG BP 4347 31055 TOULOUSE CEDEX 4, France
Jean Michel Savariault
Affiliation:
CEMES CNRS; 29, rue Jeanne MARVIG BP 4347 31055 TOULOUSE CEDEX 4, France
Jean Galy
Affiliation:
CEMES CNRS; 29, rue Jeanne MARVIG BP 4347 31055 TOULOUSE CEDEX 4, France
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Abstract

Combined soft and solid state chemistry followed by precise XRD investigations allow us to determine the Li-V-O system as well as the structural modifications induced by Li insertion in silver vanadates. On the base of these studies we propose an interpretation of both Li//V2O5 and Li//Ag2V4O11 batteries electrochemical behavior. In the I<x<3 domain, disproportionation of V4+, occurs leading to the formation of different mixtures between lithium vanadates and vanadium oxides. The different domains are related to the different steps observed in the Li//V2O5 discharge curve. It is also demonstrated that the sprouting phenomenon occurring in the Ag1+xV3O8 vanadate induces the formation of a new phase Ag2V4O11 instead of the oxygen deficient form Ag2V4O11-y. According single crystal XRD structural determination this phase is shown to be isostructural with Li1+xV3O8. Electrochemical Li insertion starts with the reduction of Ag+ leading to the lithiated phase meaning that whatever the starting phase used, the main insertion process occurs in Li1+xV3O8.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 113
Copyright
Copyright © Materials Research Society 2000

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References

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