7Li NMR studies of electrochemically lithiated V2O5 xerogels

被引：13

作者：

Holland, GP ^{[1
]}

Buttry, DA ^{[1
]}

Yarger, JL ^{[1
]}

机构：

[1] Univ Wyoming, Dept Chem, Laramie, WY 82071 USA

来源：

CHEMISTRY OF MATERIALS | 2002年 / 14卷 / 09期

关键词：

D O I：

10.1021/cm020260a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Lithium ions were electrochemically inserted into V2O5.0.5H(2)O xerogel and studied with Li-7 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 V2O5.0.5H(2)O 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 (T-1) 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.

引用

页码：3875 / 3881

页数：7

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