Influence of Calcining Temperature on the Property of Li0.33La0.56TiO3 Solid-state Ionic Capacitor

doi:10.15541/jim20180049

Abstract

Abstract:

Li_0.33La_0.56TiO₃ 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_0.33La_0.56TiO₃ calcined at higher temperature exhibited better performance, and the product synthesized at 1200℃ occupied the highest grain ionic conductivity (9.6×10^-4S/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.

Key words: lithium lanthanum titanate (LLTO), solid-state electrolyte, ionic conductivity, solid-state ionic capacitor

CLC Number:

TQ174
TM53

LU Dong-Liang, DAI Guang-Zhou, YAO Ying-Bang, TAO Tao, LIANG Bo, LU Sheng-Guo. Influence of Calcining Temperature on the Property of Li_0.33La_0.56TiO₃Solid-state Ionic Capacitor[J]. Journal of Inorganic Materials, 2018, 33(10): 1077-1082.

Figures/Tables 8

Fig. 1 XRD patterns of LLTO synthesized at different calcination temperatures

Fig. 2 SEM images of LLTO ceramics specimens prepared at different calcining temperatures(a) 900℃; (b) 1000℃; (c) 1100℃; (d) 1200℃

Fig. 3 XPS spectra of main elements in the LLTO powders calcined at 900℃ and 1200℃ (a) Titanium; (b) Lanthanum; (c) Lithium

Fig. 4 Typical EIS of the LLTO solid-state ion capacitors with different calcination temperatures with inset showing equivalent circuit

Fig. 5 Grain and grain boundary conductivities as a function of calcination temperature at room temperature

Fig. 6 Schematic diagram for a solid-state ionic capacitor

Fig. 7 The cyclic voltammograms for solid-state ion capacitors recorded under different potential windows(a)900℃; (b)1000℃; (c)1100℃; (d)1200℃

Table 1 Specific capacitance of the LLTO solid-state ionic capacitors with different calcination temperatures under a potential range of -2 V-2 V

Samples	Calcination temperature/℃	Specific capacitance/(mF∙g^-1)
1	900	0.79
2	1000	1.51
3	1100	3.29
3	1200	3.52

References 14

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Influence of Calcining Temperature on the Property of Li_0.33La_0.56TiO₃Solid-state Ionic Capacitor

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