In search of new SEs, researchers investigated the compositional space between Li3N and LiX (X=Cl,Br,I). As Li3N and the LiX salts are thermodynamically stable against LM all members on the quasi-binary Li3N-LiX phase cuts were equally expected to be stable against LM. The numerous new phases discovered are called lithium nitride-halides. Cubic LNCl which crystallizes in the antifluorite structure emerged as the best lithium-ion conducting lithium nitride halide (σRT= 1•10 -3 mS cm -1 ), demonstrating excellent (electro)chemical stability against LM, an anodic limit of >2 V (vs Li+/Li) and low electronic conductivity of <1•10 -10 S cm -1 . Marx and coworkers revisited numerous lithium nitride halides, better refined their structures and often corrected the initially reported stoichiometries. LNCl was found to have a stoichiometry of Li5NCl2, not Li9N2Cl3. Thereafter, LNCl was not revisited until Galvez-Aranda and Seminario investigated the solid-solid LM/LNCl interface with ab-initio molecular dynamics (AIMD) simulations and confirmed the stability of the interface. Sang and coworkers recently performed an abinitio high-throughput investigation and identified new lithium nitride halide phases that may potentially be synthesizable and of which some are predicted to be highly Li-ion conducting (>10 -4 S cm -1 ). LNCl crystallizes in the antifluorite structure with the Fm-3m space group. N/Cl partially occupy the (0,0,0) site with a 1:2 ratio (Figure ). The tetrahedral interstitials (0.25, 0.25, 0.25) site are partially occupied by lithium ions (82.5 %) and LNCl thus features a partially occupied lithium sub-lattice which is a good predisposition for high lithium-ion conductivity. Reinvestigating materials with promising structural features recently led to the discovery of high ionic conductivities in materials that were thought to be poorly conducting. Lithium halide ceramics with trivalent metals (Li3MX6, M=Y, Er, Zr, In…; X = Cl, Br, I), for example, had been known for decades. However, their high ionic conductivities were only discovered after Asano and coworkers in 2018 first demonstrated that ionic conductivities in the range of 0.03-1.7 mS cm -1 could be obtained for Li3YCl6 and Li3YBr6 via a mechanochemical synthesis route. In contrast, reinvestigating the electrochemical stability window of SEs, showed that previously reported stability windows were frequently too large; the stability window of SEs was systematically overestimated because of the use of semi-blocking electrodes that provide poor contact at the SE/electrode interface. In view of the above and because of its excellent stability against LM it is due time to reinvestigate LNCl.