Investigation of High-Performance All-Solid-State Lithium-Ion Batteries Based on High Ionic Conductivity Li7La3Zr2O12 Solid Electrolyte.

As interest in battery safety is increasing in the battery industry, interest in all-solid-state lithium-ion batteries and their most important material, solid electrolytes, is increasing. Among all solid electrolytes, garnet-type Li7La3Zr2O12 (LLZO) has proven to be one of the most promising electrolytes due to its high Li ion conductivity, wide potential window and electrochemical stability to metallic lithium anodes. In particular, cubic garnet-type LLZO solid electrolytes are attracting a lot of attention in the development of all-solid-state batteries with high safety, high energy density and long cycles. In this study, the optimal composition and sintering temperature were derived by adding Al, W, and Nb to synthesize a garnet-structured LLZO-based solid electrolyte powder and to form a stable cubic phase. In particular, Al, W, and Nb were doped to improve the ionic conductivity of the prepared LLZO-based solid electrolyte, and the ionic conductivity of the LLZO sintered body according to the doping composition and sintering process conditions was evaluated.