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 atomic formula unit (a.f.u.) Ga-doped cubic phase LLZO within 15 minutes. The LLZO pellet sintered at 1100 ℃ for 5 h attains 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 in the literature.