Issue 34, 2018

Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

Abstract

For single phase dielectric ceramics prepared using a traditional solid state method, the conflict between high dielectric permittivity and low breakdown strength has always limited the improvement of energy storage density. Here, we design a core–shell structure of Sr0.985Ce0.01TiO3 (SCT)@x wt% SiO2 combining a high dielectric permittivity core with an insulating shell material. The sample of x = 3 wt% sintered at 1300 °C has the largest energy storage density ∼2.23 J cm−3. The effects that different amounts of SiO2 have on phase, microstructure, dielectric and energy storage properties were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy with energy dispersive X-ray spectrum (SEM-EDS) and dielectric measurements. As verified by finite element simulations, the energy storage properties are mainly governed by the electric field distribution owing to the introduction of a high dielectric permittivity core (SCT) in a low permittivity shell. The shell material provides an electrical shielding effect around the core, resulting in significant reduction in the field strength within the core material. A comparison of experimental and simulated results is also shown, which is in good agreement with the breakdown properties.

Graphical abstract: Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

Supplementary files

Article information

Article type
Paper
Submitted
29 Jun 2018
Accepted
24 Jul 2018
First published
27 Jul 2018

J. Mater. Chem. C, 2018,6, 9130-9139

Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating

J. Qi, M. Cao, J. P. Heath, J. S. Dean, H. Hao, Z. Yao, Z. Yu and H. Liu, J. Mater. Chem. C, 2018, 6, 9130 DOI: 10.1039/C8TC03181A

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