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Updated: Dec 23, 2025
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Multilayer Structured Poly(vinylidene fluoride)-Based Composite Film with Ultrahigh Breakdown Strength and Discharged
Yongjing Zhang1, Haibo Yang1, Zhener Dang1
1Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, 710021 Xi'an, China.
Abstract:
Poly(vinylidene fluoride)-based (PVDF) composites with high discharged energy density (Ue) have been considered as advanced dielectric materials for pulsed power systems and electrical weapon systems. However, further improvement of the Ue of PVDF-based composites with higher breakdown strength (Eb) is of utmost importance. Based on the principle of voltage distribution in the multilayer structure, the multilayer structure (five-layer structure) ceramic/polymer composite films consisting of pristine PVDF layers with high breakdown strength and PVDF layers doped with one-dimensional 0.15SrTiO3-0.85Na0.5Bi0.5TiO3 (1D SNBT) fibers where the two kinds of layers stacked alternately has been designed and fabricated. Accordingly, a series of analyses of the dielectric properties and energy storage performances are presented, and the related results are tentatively explained by finite element simulation. The energy storage characteristics of the composite films are greatly improved due to the newly designed structure. An excellent Ue of 20.82 J cm-3 is achieved at an ultrahigh electric field of 640 MV m-1 with the PVDF layers containing 6 vol % SNBT fibers. Therefore, this work provides a new strategy to design and fabricate advanced polymer-based energy storage materials.
