Figure 5.

Constant plating at 0.5 mA/cm² of Li–LLZTO–Li symmetrical cells stopped for ex situ analysis with ⁷Li CSI at (a) t_Dch = 240 min and (b) t_Dch = 312 min. One-dimensional ⁷Li NMR spectra as a function of z-position in ⁷Li MRI are shown to the left of each ⁷Li CSI. The ⁷Li chemical shift corresponding to the Li metal electrode is shown at 243 ppm (dotted black line), as well as the region corresponding to Li microstructures (gray shading). Short-circuiting is evident in the voltage profile in (b) and is correlated with the Li dendrites observed in ⁷Li CSI at approx. 267 ppm. The plating (positive) and stripping (negative) electrodes are labeled in the image.