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Issue 22, 2020
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Ultrahigh enhancement rate of the energy density of flexible polymer nanocomposites using core–shell BaTiO3@MgO structures as the filler

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Abstract

Dielectric energy storage capacitors are critical components widely used in electronic equipment and power systems due to their advantages of ultrahigh power density and high voltage. Herein, a novel core–shell BaTiO3@MgO (BT@MO) nanostructure was fabricated, in which highly insulating MgO was directly coated on a continuous ferroelectric nanoparticle BaTiO3 shell through a chemical precipitation method to improve the breakdown strength and electric displacement under high electric field. A large electric displacement (D ≈ 9.8 μC cm−2 under 571.4 MV m−1) was observed along with a high discharge energy density (Ud ≈ 19.0 J cm−3) for BT@MO/P(VDF-HFP) composites, which was 187% higher than that for a P(VDF-HFP) film when the filler content was 3 wt%. The enhancement rate of Ud in this study achieved the highest level among the reported results. It was revealed that the highly insulating MgO shell can enhance the breakdown strength by preventing charge injection from electrodes and impeding the development of electrical stress during the breakdown process, as confirmed by the leakage current measurements and the finite element simulations. The core–shell BT@MO structured filler provided an effective way to improve the energy storage properties of the polymer-based dielectrics.

Graphical abstract: Ultrahigh enhancement rate of the energy density of flexible polymer nanocomposites using core–shell BaTiO3@MgO structures as the filler

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Article information


Submitted
23 Mar 2020
Accepted
05 May 2020
First published
11 May 2020

J. Mater. Chem. A, 2020,8, 11124-11132
Article type
Communication

Ultrahigh enhancement rate of the energy density of flexible polymer nanocomposites using core–shell BaTiO3@MgO structures as the filler

P. Wang, D. Zhou, H. Guo, W. Liu, J. Su, M. Fu, C. Singh, S. Trukhanov and A. Trukhanov, J. Mater. Chem. A, 2020, 8, 11124
DOI: 10.1039/D0TA03304A

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