For operando XRD measurements, the in-situ cell with a 3 mm diameter was assembled with 1.2 mg cathode composite, 7 mg LPSCl, and Li-In disk. The XRD patterns were collected in a transition mode at beamline SNBL-BM31 at the European Synchrotron Radiation Facility (ESRF) (Swiss-Norwegian Beamline, European Synchrotron Radiation Facility, Grenoble, France) using a monochromatic high brilliant X-ray beam with λ = 0.244860 Å (Data are available in Ref. [33]). The diffractometer is based on a Pilatus2M detector and data processing was done using the BUBBLES software. Before operando measurements, the beam position was optimized to hit more of the cathode side than of the electrolyte.