Preparation of microporous vanadium pentoxide membrane electrodes by phase inversion

R. D. Gordon, M. G. Kulkarni, E. L. Cussler

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Two methods were developed to create microporous membranes of vanadium pentoxide (V2O5). In one method, the membranes were made from aqueous solutions of V2O5 polymers by phase inversion in acetone. Subsequent supercritical drying removed liquid from the pores to yield a V2O5 aerogel with a specific surface area of 165 ± 30 m2/g and a mean pore diameter near 50 nm. However, air-drying destroyed the pore structure to produce a dense V2O5 xerogel with a surface area under 10 m2/g. The second method eliminated the need for supercritical drying. The phase inversion of aqueous solutions of V2O5 polymers now occurred in a mixture of acetone and propylene carbonate. Partial air-drying removed the acetone, but not the liquid propylene carbonate. The resulting V2O5 was a wet gel with a specific surface area of 270 ± 70 m2/g and a mean pore diameter near 40 nm. Scanning electron micrographs of the V2O5 gels made by the first and second method showed similar microstructures with randomly entangled fibers. Electrochemical characterization of both materials suggested their performance as cathodes in lithium batteries is limited by electronic conductivity rather than lithium diffusion.

Original languageEnglish (US)
Pages (from-to)153-160
Number of pages8
JournalJournal of Membrane Science
Volume127
Issue number2
DOIs
StatePublished - May 14 1997

Keywords

  • Batteries
  • Hydrogels
  • Membrane electrodes

Fingerprint Dive into the research topics of 'Preparation of microporous vanadium pentoxide membrane electrodes by phase inversion'. Together they form a unique fingerprint.

Cite this