This review critically examines oxide-based solid-state batteries, comparing processing routes, performance metrics, and interface challenges, and offers practical insights for scalable manufacturing and future implementation.

A NASICON solid electrolyte Li_1+xAl_xTi_2−x(PO₄)₃ (LATP) in a thin film form has been developed with ionic conductivities as high as 0.1 mS cm⁻¹. A route to achieve a 100-fold increase in the conductivity through post-annealing is discussed.