10.26165/JUELICH-DATA/FMIHIQ Kalyk, Fariza0000-0002-0926-3259(Institute of Energy Materials and Devices – Helmholtz Institute Münster: Ionics in Energy Storage (IMD-4)) Jülich DATA 2025 This dataset contains raw electrochemical impedance spectroscopy (EIS) data from the paper named Towards robust ionic conductivity determination of sulfide-based solid electrolytes for solid-state batteries . Dataset Includes: Raw EIS data files in txt format Experimental Setup: EIS measurements were performed on lithium argyrodite (Li6PS5Br) solid electrolyte under controlled conditions in a pouched cell . The frequency range spans from 1 MHz to 100 mHz with various sinusoidal excitation amplitudes of 10, 50, and 100 mV (peak voltage) and in the temperature range from 10 to 60 °C with 1 h equilibration time at each step using a VMP300 impedance analyser. The goal was to establish reproducible measurement conditions for accurate electrochemical characterization. Kalyk, Fariza(Institute of Energy Materials and Devices – Helmholtz Institute Münster: Ionics in Energy Storage (IMD-4))