Preparation and characterization of LLZO-LATP composite solid electrolyte for solid-state lithium-ion battery

Abstract

All-solid-state lithium-ion batteries (ASSLB) demonstrate significant advancements in energy density and safety comparing the traditional lithium-ion batteries, which using liquid electrolyte. The performance of ASSLBs strongly depends on the characteristics of solid electrolyte materials. Currently, Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Li7La3Zr2O12 (LLZO) have the best individual performances in the field of solid ceramic electrolytes. The purpose of this study is to investigate the characteristics of the LLZO-LATP composite electrolyte sintering at various temperatures. The dense LLZO-LATP solid composited electrolyte with acceptable electrochemical performance is successfully prepared using planetary ball-mill method. The phase and morphology of the samples were assisted by X-ray diffraction and Field-emission scanning electron microscopy. The LLZO-LATP composite sintered at 800 °C has less chemical reaction with small amount of second phase with high sintering density of 88.4%. The ionic conductivity of LLZO-LATP sintered at 800 °C is 1.3 × 10−6 Scm−1. This study addresses the lowering of sintering temperature of a composite solid electrolyte with two different structure electrolyte materials, is informative for its future research and to be promising in solid-state batteries.