Fig. 1: Characterizations of LP-xs.

Cross-sectional SEM image of an LPO prepared at a cooling condition (CL) and b at room temperature (RT). c XRD patterns of LPOs prepared under CL and RT conditions in addition to reference peaks. EIS plots of the S-cells using LPOs prepared under d CL and at e RT conditions. f Summary of the oxygen chemical bonding state of LP-xs (x = 2.20, 2.63, 5.24, and 8.78) prepared under CL conditions; here, bridging oxygen (red): Ob, nonbridging oxygen (green): Onb, and Li2O (gray). g Ionic conductivities of LP-xs at 25 °C.