Ag4V2O6F2 (SVOF): A high silver density phase and potential new cathode material for implantable cardioverter defibrillators

Frédéric Sauvage, Vincent Bodenez, Hervé Vezin, Thomas A. Albrecht, Jean Marie Tarascon, Kenneth R. Poeppelmeier

Research output: Contribution to journalReview article

37 Scopus citations

Abstract

The electrochemical reactivity of the cathode material Ag4V 2O6F2 (SVOF) versus lithium, with a particular emphasis on the lithium insertion mechanism, was studied by means of the complementary techniques in situ X-ray diffraction, electron paramagnetic resonance, and high-resolution transmisssion electron microscopy. This study confirms the initial reports of a high capacity for SVOF of 148 mAh/g above 3 V and that the reduction of silver above 3 V (vs Li+/Li0) leads to a loss of SVOF crystallinity until it becomes completely amorphous between the third and fourth lithiums inserted. Next, vanadium is reduced between 2.5 and 1.5 V (vs Li+/Li0) for the fifth and sixth lithiums inserted. In addition, the polarization within the cathode is significantly lower for the vanadium reduction than for the silver reduction. The silver metal morphologies consisted of nanoparticles (∼5 nm diameter) and dendrites and were both seen in samples of lithiated SVOF.

Original languageEnglish (US)
Pages (from-to)8464-8472
Number of pages9
JournalInorganic chemistry
Volume47
Issue number19
DOIs
StatePublished - Oct 6 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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