Enhanced Li‐ion conductivity of strontium doped Li‐excess garnet‐type Li7+xLa3‐xSrxZr2O12

Abstract

AbstractThe mechanism underlying the enhancement of the conductivity of Li7La3Zr2O12 (LLZO), an oxide‐based solid electrolyte that contains excess Li, was experimentally investigated through subvalent cation substitution. We prepared Sr‐substituted Li‐rich LLZO with high conductivity of the order of 10−4 S/cm by using a solid‐state method. We investigated the mechanism underlying the conductivity enhancement via detailed structural analysis through Sr K‐edge X‐ray absorption near edge spectroscopy and X‐ray diffraction and neutron powder diffraction analyses. The results suggested that the conductivity enhancement is due to the change in Li+ arrangement caused by the incorporation of excess Li into the LLZO lattice.