Coupled Antisite/Interstitial Li Defects Regulate Lithium Migration in Li5AlO4 Antifluorite Oxide.
Antifluorite oxides containing ordered tetrahedral voids provide a structurally flexible platform for Li-ion transport; however, experimentally identifying and controlling the defect configurations that activate these voids remains challenging. Here, Li-excess defect engineering is demonstrated in orthorhombic Li5AlO4...