AC impedance measurements were performed on Au|Li7Si2S7I|Au configuration using an impedance analyser (Keysight impedance analyser E4990A).
The experimental density of the sintered pellets was 96% of the theoretical maximum. 
A sputtered gold coating of ~2 nm thickness was used as the ion blocking electrodes.
Data were collected every 10 K from 237 to 373 K and were normalized for geometry of the pellets.
The data is in .z or .txt formats that is readable in ZView2 software which can be obtained at http://www.scribner.com