Optimizing Li1.3Al0.3Ti1.7(PO4)(3) Particle Sizes toward High Ionic Conductivity

NASICON-type Li1.3Al0.3Ti1.7(PO4)(3) (LATP) has attracted a lot of attentionbecauseof its high ionic conductivity and stability to air and moisture.However, the size effect of LATP primary particles on ionic conductivityis ignored. In this study, different sizes of LATP particles are preparedto investigate the morphology, relative density, and ionic conductivityof the LATP solid electrolyte. The influences of particle size andsintering temperature on the microstructure, phase composition, andelectrical properties of LATP ceramics were systematically studied.The medium-sized LATP particle (2 & mu;m) presents a great microstructurewith a high relative density of over 97%, the highest ionic conductivityof 6.7 x 10(-4) S cm(-1), andan activation energy of 0.418 eV. The Li-Li symmetric cellsand Li-LFP batteries delivering good electrochemical performancewere fabricated with highly conductive LATP ceramics. These resultsmake significant strides in elucidating the relationship between theparticle sizes of LATP and its electrochemical performance.