Abstract
Diffusion of Li+ ions in solids is a basic principle behind the operation of Li-ion batteries. Although a diffusion coefficient of Li+ (DLi) in solids is usually evaluated by 7Li-NMR, difficulties arise for materials that contain magnetic ions. This is because the magnetic ions contribute additional spin–lattice relaxation processes that are considerably larger than the 1/T1 expected from only Li diffusion. As a result, it is very difficult to estimate correct DLi by Li-NMR, although DLi is one of the primary parameters that govern the charge and discharge rate of a Li-ion battery, particularly for the case of a future solid-state battery. We have, therefore, initiated to measure DLi in solids with muon-spin relaxation (μSR). Here, we summarize our μSR work on Li-diffusion and compare the μSR result with that obtained by QENS from the viewpoint of time window.
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