The predicted oxidation of LNCl to LiN3 calculated to occur at 0.50 V may potentially be kinetically inhibited even at very slow currents because LiN3 formation necessitates a complex anionic rearrangement to form the [N3] -moieties present in azides. Such complex anionic rearrangements are additionally hampered by the likely limited RT diffusivity of Cl -/N 3-in LNCl. In the potential scenario of kinetically inhibited LiN3 formation the calculated anodic decomposition voltage would be extended from 0.50 V to 0.63 V vs (Li + /Li) (Figure ), which is even closer to our experimental value of ~0.6 V. In principle, the cathodic limit of SEs can be measured in an analogous way to the anodic limit. However, the use of composite SE-C electrodes makes it difficult to distinguish between the lithiation of carbon additives and the lithiation of the SE at potentials close to 0 V vs Li + /Li. Hartwig and coworkers reported chemical stability of LNCl against LM. This stability was investigated by dipping LNCl into molten Li and the absence of any observed reaction. We repeated this experiment keeping LNCl powder submerged in molten Li at 210 °C for 2h. No new peaks were observed after this in our XRD experiments (Figure ). Additionally symmetric Li|LNCl|Li cells display flat stripping/plating plateaus and no increase in the cell voltage (Figure ) over time, indicating a stable LM/LNCl interface.