Influence of Calcining Temperature on the Property of Li 0.33 La 0.56 TiO 3 Solid-state Ionic Capacitor

Abstract

Li 0.33 La 0.56 TiO 3 was synthesized under different calcination temperatures by using solid-state reaction method and assembled as LLTO solid-state ionic capacitors in this study. X-ray powder diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) were employed to investigate the influence of calcination temperature on the microstructure, morphology, ionic conductivity, and the energy storage property of the as-prepared products. Results indicate that Li 0.33 La 0.56 TiO 3 calcined at higher temperature exhibited better performance, and the product synthesized at 1200℃ occupied the highest grain ionic conductivity (9.6×10 -4 S/cm) with obvious double-layer capacitor characteristics, while the specific capacitor is nearly 3.52 mF/g at a 4 V potential window. Besides, the specific capacitor of the solid-state capacitor increases with the increment of grain ionic conductivity and effected by the contact area between electrode and solid electrolyte.