Ultrahigh enhancement rate of the energy density of flexible polymer nanocomposites using core–shell BaTiO3@MgO structures as the filler. Issue 22 (22nd May 2020)

• Record Type: Journal Article
• Authors: Wang, Peng-Jian; Zhou, Di; Guo, Huan-Huan; Liu, Wen-Feng; Su, Jin-Zhan; Fu, Mao-Sen; Singh, Charanjeet; Trukhanov, Sergei; Trukhanov, Alex
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 22(2020)
• Page Start: 11124
• Page End: 11132
• Publication Date: 2020-05-22
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta03304a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An ultrahigh enhancement rate of U d (≈187%) and U d (≈19 J cm −3 ) have been obtained for P(VDF-HFP)-based nanocomposites using novel core–shell BaTiO3 @MgO as the filler. 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 U d 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.