7Li NMR studies of electrochemically lithiated V2O5 xerogels

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

doi:10.1021/cm020260a

⁷Li NMR studies of electrochemically lithiated V₂O₅ xerogels

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

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	3875-3881
Number of pages	7
Journal	Chemistry of Materials
Volume	14
Issue number	9
DOIs	https://doi.org/10.1021/cm020260a
State	Published - Sep 2002
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm020260a

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title = "7Li NMR studies of electrochemically lithiated V2O5 xerogels",

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.",

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T1 - 7Li NMR studies of electrochemically lithiated V2O5 xerogels

AU - Holland, G. P.

AU - Buttry, D. A.

AU - Yarger, J. L.

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Y1 - 2002/9

N2 - 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.

AB - 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.

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⁷Li NMR studies of electrochemically lithiated V₂O₅ xerogels

Abstract

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