Ultrafine core-shell BaTiO3@SiO2 structures for nanocomposite capacitors with high energy density

By K. Bi, M. Bi, Y. Hao, W. Luo, Ziming Cai, Xiao-hui Wang, Yunhui Huang. Nano Energy, 2018

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Abstract Dielectric capacitors are irreplaceable energy-storage components in pulsed power systems, but the low energy density (Ue) of existing material systems restricts their miniaturization and further application. In this work, a novel polymer/ceramic nanocomposite is fabricated using core-shell BaTiO3@SiO2 (BT@SO) structures with a diameter less than 10 nm. Such ultrafine nanostructure not only provides a high insulating SiO2 layer to optimize the microstructure and dielectric response as normal core-shell structures, but also has almost tenfold larger interfaces than conventional 100 nm fillers to realize a high polarization, which can effectively improve the breakdown strength as well as the electrical displacement of the composite simultaneously. With a simple and universal 0–3 type structure, in which 0-dimentional nanoparticles are embedded in a 3-dimentional connected polymer matrix, the BT@SO/PVDF nanocomposite shows outstanding energy storage performance with Umax = 11.5 J/cm3 at 420 kV/mm. Experimental result and phase field simulation both confirm the superiority of the ultrafine nanostructures in enhancing the energy density of the dielectric nanocomposite, providing a new technological way for the design of high energy-density composites.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/7c35607687facd79821aebab5db120634ad1b026