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Vanadium Pentoxide Gels from Liquid Crystals to Lithium Batteries

Published online by Cambridge University Press:  16 February 2011

J. Livage ,
N. Baffier ,
J.P. Pereira-Ramos  and
P. Davidson
J. Livage
Affiliation:
Chimie de la Matiére Condensée, Université P.M. Curie, 75252 Paris -, France
N. Baffier
Affiliation:
Chimie de la Matiére Condensée, Université P.M. Curie, 75252 Paris -, France
J.P. Pereira-Ramos
Affiliation:
LECSO/CNRS, 2 rue Henri Dunant, 94320 Thiais -, France
P. Davidson
Affiliation:
Physique des Solides, Université Paris Sud, 91405 Orsay -, France
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Abstract

Vanadium pentoxide gels V205.nH20 are formed via the condensation of vanadic acid in aqueous solutions. They exhibit both ionic and electronic conductivity and could therefore be used as cathode materials in lithium batteries or electrochromic display devices. The polymerization process leads to ribbon-like vanadium pentoxide particles. In a given range of concentration, sols and gels exhibit a homogeneous lyotropic nematic phase in which the ribbons align in the same direction. Ordered fluid phases are thus obtained leading to oriented films when deposited onto flat substrates. Moreover, mixed oxides MxV205 (M = Na+, K+,Ba2+, Al3+, Fe3+,Fe3+,...) exhibiting some preferred orientation are obtained via ion exchange.These compounds exhibit improved lectrochemical properties (specific capacity, cycling properties) compared to usual mixed oxides prepared via solid state reactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 179
Copyright
Copyright © Materials Research Society 1995

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