Rapid solvent-free synthesis of Ga-doped LLZO (Li5.5Ga0.5La3Zr2O12): towards scalable garnet electrolyte for next generation solid-state batteries

Abstract

Gallium (Ga) doping in the LLZO family is a well-known strategy for achieving high lithium-ion conductivity. Here, we report a one-step solvent-free combustion synthesis of 0.5 atom per formula unit (p.f.u.) Ga-doped cubic phase LLZO within 15 minutes. The LLZO pellet sintered at 1100 °C for 5 h exhibits a total Li-ion conductivity of 5.8 × 10⁻⁴ S cm⁻¹ with an activation energy of 0.3 eV, comparable to existing state-of-the-art processes.