were studied from 173 K to 403 K at Li resonance frequency of 233 MHz and from 253 K to 353 K at Li resonance frequency of 291 MHz and an effective frequency of 133 KHz. The electrolytes were characterized by XRD, EIS and EDXRF to ensure expected crystallinity, ionic conductivity and stoichiometry. In the temperature range and frequencies studied, the relaxation rates in Li6PS5Cl seem to be consistent with the Bloembergen-Pound-Purcell (BPP) theory for dipolar interaction of two Li nuclei while in LiInCl6, LiYCl6 and Li1.48Al0.48Ge1.52(PO4)3 BPP theory is insufficient to explain the rates of NMR relaxation.