Synthesis and electrochemical evaluation of high capacity nanostructured VO2 cathodes

A. M. Kannan, A. Manthiram

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

A metastable form of vanadium dioxide - designated as VO2(B) - has been synthesized by an ambient temperature reduction of aqueous vanadate ions with potassium borohydride and sodium dithionite followed by heating in vacuum at 230 °C. The samples have been characterized by X-ray diffraction, thermogravimetric analysis (TGA), infrared spectroscopy, scanning electron microscopy (SEM), and electrochemical discharge-charge cycling in lithium cells. These oxides exhibit a high reversible capacity of>300 mAh/g at 3.5-1 V and a moderate reversible capacity of close to 200 mAh/g at 3.5-2 V with good cyclability in a wide temperature range of -30 to 60 °C. Also, the VO2(B) cathodes exhibit excellent safety characteristics as indicated by the absence of exothermic peaks below 350 °C in differential scanning calorimetry (DSC).

Original languageEnglish (US)
Pages (from-to)265-271
Number of pages7
JournalSolid State Ionics
Volume159
Issue number3-4
DOIs
StatePublished - Apr 1 2003
Externally publishedYes

Keywords

  • Charge-discharge cycling
  • Chemical synthesis
  • Lithium-ion battery
  • Vanadium oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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