Figure 1.

(a) Schematic of a symmetrical Li–LLZTO–Li cell depicting the orientation with respect to the external magnetic field, B₀, during the ⁷Li CSI experiment. ⁷Li chemical shift images of (b) pristine and (c) cycled Li–LLZTO–Li symmetrical cells. The ⁷Li NMR signal of LLZTO is significantly more intense than that of Li metal and is truncated as indicated by hashes. The combination of the higher intensity and Lorentzian lineshape of the LLTZO resonance results in more visible noise in the baseline of this resonance in the two-dimensional spectra, as compared to that seen for Li metal. Galvanostatic cycling was performed at current densities of 0.2–1.0 mA/cm² to induce a short-circuit through the cell shown in (c) (Figure S2).