. Also the exact quenching procedure is not described in detail in refs. and 37 . The lattice constant 5.396 Å that we determined from our XRD Rietveld refinements (Figure , Table ) for LNCl fits well into the range of lattice parameters determined in previous studied (5.386 Å to 5.416 Å). The purity of LNCl-I was verified by XRD and no impurities were observed (Figure ). Figure shows the electrochemical impedance spectrum (EIS) Nyquist plot of LNCl-I at room temperature (RT). The impedance of LNCl-I could be fitted with a resistor (R) parallel to a constant phase element (CPE). The effective capacitance of the CPE calculated with Brug's formula is 49 pF which is a value typically associated with ion conduction in the bulk of solid ion conductors. A prominent secondary process in the impedance that may for instance arise from grain boundaries was not observed even at -30°C (Figure ). We thus interpret the impedance of LNCl-I at RT as bulk dominated. We calculated the ionic conductivity of LNCl to be 1•10 -3 mS cm -1 at RT, which comparable with previous reports. The activation energy measured from temperature dependent impedance spectroscopy was 0.471 ± 0.005 eV which is close to the value of 0.49 eV previously reported for LNCl. Complimentary to EIS, Li NMR provides insights on Li diffusion in ion conductors. Figure shows the 7 Li NMR signal linewidth evolution with increasing temperature for LNCl-I and the typical line shape narrowing profile was observed. The activation energy of the diffusion process that inflicts the linenarrowing can be obtained from the phenomenological equation derived by Hendrickson and Bray (H.-B.) :