Synthesis and Characterization of LAGP-Based Lithium Ion-Conductive Composites with an LLTO Additive

Abstract Lithium ion-conductive composites have been prepared by dispersing perovskite Li0.348La0.55TiO3 (LLTO) particles in a NASICON-type Li1.5Al0.5Ge1.5(PO4)3 (LAGP) matrix. Powder X-ray diffraction suggests that the matrix/particle reaction occurs during the sintering process, where LLTO decomposes into LaPO4 particles as well as substituting the Ge4+ in the LAGP matrix with Ti4+. An increase in electrical conductivity by the LaPO4 particle dispersion is observed at the introduction of 4 wt% LLTO to reach the highest conductivity of 4.04 × 10−4 S cm−1. Galvanostatic tests using asymmetric electrodes indicate that lithium ions are the predominant charge carrier in this type of composite electrolyte.