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7 Li NMR measurements have been performed to study milling effects on ionic diffusion in lithium cobalt oxide, LiCoO 2 and piezoelectric compound, LiNbO 3 prepared by mechanical milling method. The milling process gives quite different effects on NMR spectra of these compounds. Both 7 Li MAS and static NMR spectra of the milled LiCoO 2 show the line broadening with...
Li + ionic diffusion in LiCoO 2 exposed to ball milling was studied by XRD, complex resistivity, and NMR. Angular frequency dependence of the complex resistivity is analyzed by using a Debye-type relaxation model. The Li + ion hopping time becomes fast by exposing to short-time milling, whereas it becomes slow by exposing to long-time milling. The activation energy of the Li...
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