@article {Sugiyama2014,
	title = {8 Li $\beta$-NMR study of epitaxial Li x CoO 2 films},
	journal = {J. Phys.: Conf. Ser.},
	volume = {551},
	number = {1},
	year = {2014},
	pages = {012009},
	abstract = {In order to investigate the diffusive motion of Li + in a thin film electrode material for Li-ion batteries, we have measured β -NMR spectra of 8 Li + ions implanted into epitaxial films of Li 0.7 CoO 2 and LiCoO 2 in the temperature range between 10 and 310 K. Below 100 K, the spin-lattice relaxation rate (1/ T 1 ) in the Li 0.7 CoO 2 film increased with decreasing temperature, indicating the appearance and evolution of localized magnetic moments, as observed with μ + SR. As temperature is increased from 100 K, 1/ T 1 starts to increase above ~ 200 K, where both Li- NMR and μ + SR also sensed an increase in 1/ T 1 due to Li-diffusion. Interestingly, such diffusive behavior was found to depend on the implantation energy, possibly because the surface of the film is decomposed due to chemical instability of the Li 0.7 CoO 2 phase in air. Such diffusive behavior was not observed for the LiCoO 2 film up to 310 K.},
	url = {http://stacks.iop.org/1742-6596/551/i=1/a=012009},
	author = {J Sugiyama and M Harada and H Oki and S Shiraki and T Hitosugi and O Ofer and Z Salman and Q Song and D Wang and H Saadaoui and G D Morris and K H Chow and W A MacFarlane and R F Kiefl}
}
