An alternating multilayer architecture boosts ultrahigh energy density and high discharge efficiency in polymer composites

Abstract

Poly(vinylidene fluoride) (PVDF)-based polymers with excellent flexibility and high breakdown strengths are desirable compared to the traditional bulk ceramic in dielectric material applications.

Research Advances in Hierarchically Structured PVDF-Based All-Organic Composites for High-Energy Density Capacitors

“…In order to further decrease the loss and enhance the energy storage performance of multilayered all-polymer membranes, PVDF polymer was replaced by linear PMMA. Zhang et al synthesized alternating multilayers by combining PMMA with P(VDF-HFP) via stacking method (shown in Figure 10 ) [ 45 ]. Experiments show that the dielectric constant of the multilayer membranes is about 2 times that of pristine PMMA.…”

“…( f ) Comparison of the energy storage properties of the multilayer composite films. Adapted with permission from [ 45 ], Copyright © 2022 The Royal Society of Chemistry.…”

Simultaneous Realization of Significantly Enhanced Breakdown Strength and Moderately Enhanced Permittivity in Layered PMMA/P(VDF–HFP) Nanocomposites via Inserting an Al2O3/P(VDF–HFP) Layer

“…Moreover, the simulation was achieved via the COMSOL Multiphysics software. 2a−c, benefiting from the significant ferroelectricity originated from the large number of polar groups, 33 pure P(VDF−HFP) keeps the highest permittivity. As expected, the AO/F single-layer composites obtain a slightly weakened permittivity compared with pure P(VDF−HFP) due to the low permittivity of Al 2 O 3 .…”

“…The dielectric properties of pure PMMA, pure P(VDF− HFP), AO/F single-layer composites, the F−M bilayer composite, and F−AO/F−M trilayer composites are presented in Figure 2a−d. As shown in Figure2a−c, benefiting from the significant ferroelectricity originated from the large number of polar groups,33 pure P(VDF−HFP) keeps the highest permittivity. As expected, the AO/F single-layer composites obtain a slightly weakened permittivity compared with pure P(VDF−HFP) due to the low permittivity of Al 2 O 3 34,35.…”

Structure design boosts concomitant enhancement of permittivity, breakdown strength, discharged energy density and efficiency in all‐organic dielectrics

“…When the outer layer content was 20 vol.%, they achieved a favourable energy density of 18.8 J/cm 3 and the finite element method simulation revealed the interfaces between two different layers could block the development of electrical trees, which accounts for the much higher breakdown strength. With the development of fabrication technics, researchers expanded the sandwich structure to multilayer structure [35][36][37][38][39] and even gradient structure [26,40,41]. Zhu et al utilised the multilayer coextrusion technics to investigate a number of polymer films with a multilayer structure, such as PC/ P(VDF-HFP) [35,36], PSF/PVDF [37].…”