Abstract
Lithium diffusion in spinel and compounds for future battery applications has been studied with muon spin relaxation (. Measurements were performed on both thin-film and powder samples in the temperature range between 25 and 500 K. For and above about , the field distribution width ( is found to decrease gradually, while the field fluctuation rate ( increases exponentially with temperature. For , on the contrary, the curve shows a steplike decrease at , around which the curve exhibits a local maximum. These behaviors suggest that starts to diffuse above around 200 K for both spinels. Assuming a jump diffusion of at the tetrahedral site to the vacant octahedral site, diffusion coefficients of at 300 K in the film samples are estimated as /s for and /s for . Further, some small differences are found in both thermal activation energies and Li-ion diffusion coefficients between the powder and thin-film samples.
3 More- Received 15 May 2015
- Revised 29 June 2015
DOI:https://doi.org/10.1103/PhysRevB.92.014417
©2015 American Physical Society