Unlocking Li superionic conductivity in face-centred cubic oxides via face-sharing configurations.

ABSTRACT: Oxides with a face-centred cubic (fcc) anion sublattice are generally not considered as solid-state electrolytes as the structural framework is thought to be unfavourable for lithium (Li) superionic conduction. Here we demonstrate Li superionic conductivity in fcc-type oxides in which face-sharing Li configurations have been created through cation over-stoichiometry in rocksalt-type lattices via excess Li. We find that the face-sharing Li configurations create a novel spinel with unconventional stoichiometry and raise the energy of Li, thereby promoting fast Li-ion conduction. The over-stoichiometric Li-In-Sn-O compound exhibits a total Li superionic conductivity of 3.38 × 10^-4 S cm^-1 at room temperature with a low migration barrier of 255 meV. Our work unlocks the po

SUBMITTER: Chen Y 

PROVIDER: S-EPMC10990923 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature