Li diffusion in Li${}_x$CoO${}_2$ probed by muon-spin spectroscopy

Abstract

The diffusion coefficient of Li${}^{+}$ ions ($D_{\mathrm{Li}}$) in the battery material Li${}_x$CoO${}_2$ has been investigated by muon-spin relaxation (${\mu }^{+}$SR). Based on the experiments in zero-field and weak longitudinal-fields at temperatures up to 400 K, we determined the fluctuation rate ($\nu$) of the fields on the muons due to their interaction with the nuclear moments. Combined with susceptibility data and electrostatic potential calculations, clear Li${}^{+}$ ion diffusion was detected above $\sim 150$K. The $D_{\mathrm{Li}}$ estimated from $\nu$ was in very good agreement with predictions from first-principles calculations, and we present the ${\mu }^{+}$SR technique as an % novel and optimal probe to detect $D_{\mathrm{Li}}$ for materials containing magnetic ions.

4 pages, 4 figures. accepted for publication in PRL

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