Munekazu Motoyama, Kyushu University
The Influence of Temperature on Li Plating/Stripping at Metal/Oxide Solid Electrolyte Interfaces
Written by Xinzi He
Oxide solid electrolytes (Li-ion conductors) are non-flammable and have no risk of releasing toxic gas. Munekazu Motoyama started the talk with two mechanisms of short-circuiting: the isolated void formation on the interface and hydrostatic pressure of Li at the flaw. Prof. Motoyama then introduced his systematical study on how different factors, including temperature, area, pressure, and interface wetting, would influence the critical current density (CCD) for short-circuiting using Li6.6La3Zr1.6Ta0.4O12 (LLZT) solid electrolyte. The CCD was found to increase with the increase of the temperature and the increase of the LLZT thickness. Moreover, the activation energies of the CCDs were also discussed. An important founding is that the improvement of the wettability between Li and LLZT does not help increase the CCD. At the end, Prof. Motoyama and the audience also discussed the experiment setup on the electrode constructions.