Fast microwave-assisted synthesis of Li-stuffed garnets and insights into Li diffusion from muon spin spectroscopy†

摘要: Lithium-stuffed garnets attract huge attention due to their outstanding potential as solid-state electrolytes for lithium batteries. However, there exists a persistent challenge in the reliable synthesis of these complex functional oxides together with lack complete understanding lithium-ion diffusion mechanisms important materials. Addressing issues is critical realizing application garnet materials all In this work, cubic phase nominal composition Li6.5Al0.25La2.92Zr2O12 synthesized through microwave-assisted route first time, reducing considerably reaction times and heating temperatures. Lithium-ion behavior investigated by electrochemical impedance spectroscopy (EIS) state-of-art muon spin relaxation (μSR) spectroscopy, displaying activation energies 0.55 ± 0.03 eV 0.19 0.01 respectively. This difference arises from high inter-grain resistance, which contributes total resistance EIS measurements. contrast, μSR acts local probe providing insights on order lattice, giving an estimated value 4.62 × 10−11 cm2 s−1 coefficient. These results demonstrate lithium-stuffed electrolyte all-solid state batteries, area growing interest energy storage community.