Optimizing sandwich-structured composites based on the structure of the filler and the polymer matrix: toward high energy storage properties |
| |
| Authors: | Yang Cui Xuan Wang Tiandong Zhang Changhai Zhang Qingguo Chi |
| |
| Affiliation: | Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080 PR China, Fax: +86-451-86391681 ; School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080 PR China |
| |
| Abstract: | Polymer-based energy storage materials have been widely applied in the energy storage industry, such as in the hybrid electric vehicle and power-conditioning equipment, due to their moderate energy density and ultrafast charging/discharging speed. Accordingly, the improvement of the energy storage density of polymer matrix composites has become the focus of current research. In this study, different fillers (e.g., 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 nanofibers (BCZT NFs), BCZT + Ag NFs and BCZT + Ag@Al2O3 NFs) were synthesized via electrospinning and were added to the poly(vinylidene fluoride) (PVDF) matrix as a middle layer in sandwich-structure composites. The PVDF polymer-containing PMMA was prepared as the outer layer in the sandwich structure composites. These sandwich-structured composites have low loss, low current density, better breakdown strength and higher efficiency. In particular, 40% PMMA/PVDF/3 vol% BCZT + Ag@Al2O3/PVDF/40% PMMA/PVDF composites have an energy density of 7.23 J cm−3 and efficiency above 75.8% at 370 kV mm−1. This article could open up a convenient and effective means for the practical application of power-pulsed capacitors by tuning the filler nanostructure and polymer nanocomposites.Inorganic composite fillers and sandwich-structured composite films have been designed for further increasing the energy storage density. |
| |
| Keywords: | |
|
|
