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Silver-Doped Vanadium Oxides as Host Materials for Lithium Intercalation

Published online by Cambridge University Press:  10 February 2011

F. Coustier,
S. Passerini,
J. Hill and
W. H. Smyrl
F. Coustier
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, MN 55455
S. Passerini*
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, MN 55455
J. Hill
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, MN 55455
W. H. Smyrl
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, MN 55455
*
* passerin@cems.umn.edu
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Abstract

An improved cathodic material has been obtained by doping vanadium oxide hydrogel with silver. Silver-doped vanadium pentoxides with a silver molar fraction ranging from 0.01 to 1 were synthesized. With the successful doping, the electronic conductivity of V2O5 was increased by 2 to 3 orders of magnitude. The electrochemical performance of the silver doped materials is very high, up to 4 moles of lithium per mole of silver-doped V2O5 were found to be reversibly intercalated. In addition, the lithium diffusion coefficient is found to be high in the silver-doped material and with a smaller dependence on the lithium intercalation level. These enhancements resulted in high rates of insertion and delivered capacities.

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References

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