Enhanced ionic conductivity of composite solid electrolyte by directionally ordered structures of linear Li1.3Al0.3Ti1.7(PO4)3

Preparation of LATP solid electrolytes using electrostatic spinning method with improved ionic conductivity. • First sol–gel formulation of a stable LATP precursor spinning solution capable of electrostatic spinning. • For the first time, Linear LATP composite solid electrolyte with oriented and ordered structure was prepared by electrospinning. • A high ionic conductivity of LATP solid electrolyte (σ RT = 2.05 × 10 –4 S·cm-1) and Li + migration number is 0.708. The NASICON-type solid electrolyte structure of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) exhibits good electrochemical performance and thermal stability, and has been promising as a solid electrolyte. Here, a stable good-stability LATP precursor spinning solution was prepared using the sol–gel method for the first time. A linear LATP solid electrolyte with an oriented ordered structure was obtained using improved electrostatic spinning equipment. The sintering process regime of the LATP-ordered construction was determined. The ionic conductivity of the prepared LATP-PEO/LiClO 4 -PEG composite solid-state electrolyte with an ordered structure was as high as 2.05 × 10 -4 S·cm −1 at room temperature (25 °C), one order of magnitude higher than the ionic conductivity of the LATP composite solid-state electrolyte reported so far. Organic solid-state electrolytes to protect LATP-ordered structured solid-state electrolytes yield excellent electrochemical stability in lithium-metal batteries.