Lithium superionic conductors with corner-sharing frameworks

Superionic lithium conductivity has only been observed in a few classes of materials, mostly in thiophosphates but rarely in oxides. Corner-sharing connectivity in an oxide crystal structure framework is now shown to promote superionic conductivity. Superionic lithium conductivity has only been discovered in a few classes of materials, mostly found in thiophosphates and rarely in oxides. Herein, we reveal that corner-sharing connectivity of the oxide crystal structure framework promotes superionic conductivity, which we rationalize from the distorted lithium environment and reduced interaction between lithium and non-lithium cations. By performing a high-throughput search for materials with this feature, we discover ten new oxide frameworks predicted to exhibit superionic conductivity-from which we experimentally demonstrate LiGa(SeO3)(2) with a bulk ionic conductivity of 0.11 mS cm(-1) and an activation energy of 0.17 eV. Our findings provide insight into the factors that govern fast lithium mobility in oxide materials and will accelerate the development of new oxide electrolytes for all-solid-state batteries.

Automated summary

Superionic lithium conductivity has been observed in only a few materials, mainly in thiophosphates and rarely in oxides. This study reveals that the corner-sharing connectivity in the oxide crystal structure framework promotes superionic conductivity. By conducting a high-throughput search, the researchers discovered ten new oxide frameworks predicted to exhibit superionic conductivity. They also experimentally confirmed the high ionic conductivity of LiGa(SeO3)(2), demonstrating its potential as a new oxide electrolyte. These findings offer insight into the factors that govern fast lithium mobility in oxide materials and will accelerate the development of all-solid-state batteries.