Structural Complexity and Electrical Properties of the Garnet-Type Structure LaLi0.5Fe0.2O2.09 Studied by 7Li and 139La Solid State NMR Spectroscopy and Impedance Spectroscopy

Garnet-like structures containing lithium are of interest for applications in lithium ion batteries because of their inherent lithium ion conductivity and stability against chemical reaction with Li. Here, a series of materials, with parent composition LaLi0.5Fe0.2O2.09, are synthesized using solid-state chemistry, and characterized, in terms of their structure, using a combination of powder X-ray diffraction (PXRD), 7Li, and 139La solid-state …