fig3

Figure 3. (A) Atomic-resolution high-angle annular dark-field-scanning transmission electron microscope image of cubic-LLZO (c-LLZO)in-situ contacted with Li. O K-edges obtained in the EELS line scan. The two-peak characteristic of c-LLZO is indicated with dashed lines. Schematic illustration of the observed interface behaviour when c-LLZO was contacted with Li. This process led to a tetragonal-LLZO-like interphase. Reprinted (adapted) with permission from Ma et al.^[104]. Copyright (2016) American Chemical Society. (B) Scanning electron microscopy (SEM) cross-section image of a LATGP sample after 12 h contact with Li. The white arrow indicates the chemical diffusion of lithium into the material. XPS detail spectra of a LATGP sample before (bottom, black line) and after lithiation (middle, red line). Reprinted (adapted) with permission from Hartmann et al.^[106]. Copyright (2013) American Chemical Society. (C) Cryo-STEM DF image of Li|LiPON interphase, where five spots highlighted in the green arrow are sampled to extract EELS spectra of Li K-edge, P L-edge, and O K-edge shown. Li K-edge, P L-edge, and O K-edge EELS spectra of L_i2O, Li₃P, Li₃PO₄, and LiPON. Li|LiPON multilayer interphase scheme. This figure is quoted with permission from Cheng et al.^[68].