7Li NMR studies of electrochemically lithiated V2O5 xerogels

G. P. Holland, D. A. Buttry, J. L. Yarger

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Lithium ions were electrochemically inserted into V2O5·0.5H2O xerogel and studied with 7Li magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Two distinct lithium environments were resolved and assigned to lithium ions occupying either interfacial or intercalated sites in the V2O5·0.5H2O xerogel matrix. Lithium chemical shifts, relaxation measurements, and variable-temperature (VT) MAS NMR are used to determine the mobility of both interfacial and intercalated lithium ions and the associated coupling to paramagnetic sites on the V2O5 xerogel lattice. From spin-lattice relaxation (T1) data, a minimum is observed, yielding an average polaron correlation time in excellent agreement with a value based independently on conductivity measurements. Thus, revealing that the dominant relaxation mechanism is associated with the nuclear dipole coupling to polaron motion.

Original languageEnglish (US)
Pages (from-to)3875-3881
Number of pages7
JournalChemistry of Materials
Volume14
Issue number9
DOIs
StatePublished - Sep 1 2002

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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