Relative Li-ion mobility mapping in Li0.33La0.56TiO3 polycrystalline by electron backscatter diffraction and electrochemical strain microscopy

Abstract

Li-ion conductivity in a solid-state electrolyte has so far been measured by impedance spectroscopy. In this method, however, it is difficult to obtain microstructural information because of the absence of spatial resolution. Here, we show the relationship between the Li-ion mobility and the crystal orientation in Li0.33La0.56TiO3 polycrystalline by electrochemical strain microscopy combined with electron backscatter diffraction. On the experimentally constructed multivariable regression model, we obtained a qualitative Li-ion mobility map of sub-millimeter width with a 100 nm spatial resolution, which is impossible to achieve by only atomic force microscopy. The proposed method must be useful for identifying the Li-ion diffusion pathway in three dimensions.