Li Diffusion in All-Solid-State Batteries Imaged Through Optically and Electron Transparent Electrodes
Alexander Yulaev, Talin Alec, Leite Marina, Andrei A. Kolmakov
We report spatially- and depth-resolved study of Li intercalation into a thin-film solid electrolyte applying a combination of optical and electron microscopy. Due to difference in electron yield from pristine and lithiated LiPON regions, the Li transport in the electrolyte can be mapped using different electron beam accelerating voltages. Varying the depth of electron interaction volume by changing energy of electron beam from 2 keV to 15 keV, we selectively probe an electrolyte lithiated on one side at different depths. This approach can be used to reconstruct 3D diffusion pathways of Li similar to SEM tomography. We envision that depth selective electron microscopy of thin-film ion batteries will help elucidate the role of temperature, chemical and morphological inhomogeneity of the electrolyte in Li ion transport.
Microscopy and Microanalysis conference proceedings