Abstract
Lithium ions were electrochemically inserted into V 2 O 5 .0.5H 2 O xerogel and studied with 7 Li 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 V 2 O 5 .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 V 2 O 5 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.
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