Lithium ion conduction in doped LaLiO2 system

Solid solutions of the lithium ion conductor LaLiO2 were synthesized using a solid-state reaction method. For the strontium-doped system, Sr2 + was partially doped at the La sites with the composition La1 − xSrxLi1 + xO2 (x = 0.1, 0.2), which introduced excess lithium into the structure, while for the magnesium-doped system, Mg2 + was partially doped at the Li+ site with LaLi1 − 2yMgyO2 (y = 0.1, 0.2) which introduced Li+ vacancies. The magnesium-doped sample with y = 0.1 in LaLi1 − 2yMgyO2 showed higher ionic conductivity of 9.22 × 10− 5 S cm− 1 than that of the respective Sr doped sample of x = 0.1 in La1 − xSrxLi1 + xO2 (4.64 × 10− 5 S cm− 1) at 300 °C. Higher ionic conductivity in the Mg doped system indicates that vacancies led to high lithium ion conduction in LaLiO2. The doped LaLiO2 systems are a novel lithium conductive oxides family.