High Breakdown Strength and Energy Density in Multilayer-Structured Ferroelectric Composite

Abstract

All-organic dielectric composites are drawing increased attention owing to their high operating voltage, low loss, and superior processability. However, polymers usually possess a relatively lower dielectric constant than most the other dielectrics, which seriously suppresses the improvement of their energy density. In this work, multilayer-structured composites with excellent dielectric and energy storage properties are prepared by the stacking method, and the effect of layer numbers on the performance of the composites is studied. High-κ polymers such as poly(vinylidenefluoride) (PVDF) and poly(vinylidenefluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) are used to prepare the composites with different layers. It is found that the dielectric constant is up to 14.45 at 1 kHz, which is increased with the volume fraction of the P(VDF-TrFE-CTFE) layer and layer number of the composites. Due to the increased dielectric constant, an ultrahigh discharge energy density of 18.12 J/cm 3 is achieved at the electric field of 620 kV/mm. This study exhibits an effective routine to prepare flexible high-performance dielectric materials.

Enhancing the Energy‐Storage Density and Breakdown Strength in PbZrO3/Pb0.9La0.1Zr0.52Ti0.48O3‐Derived Antiferroelectric/Relaxor‐Ferroelectric Multilayers

“…In the literature, the decrease in leakage current is attributed to the restriction of the movement of charge carriers across the interfaces of different layers. [ 3,28,44–46 ] Following this idea we can infer that the remarkable enhancement in breakdown strengths in the multilayer films is related to the number of layers and it suggests that the interfaces, by some interface related effect, block the conductive paths and in this way decrease the chance of the growth of an electrical breakdown path in the multilayer structure.…”

Research Progress on Multilayer‐Structured Polymer‐Based Dielectric Nanocomposites for Energy Storage

“…[2,3,[37][38][39][40][41][42][43] MSPBDNs exhibit superior breakdown strength and suppression of dielectric loss compared to single-layered polymer-based dielectric nanocomposites with randomly distributed nanofillers. [2,21,37,[44][45][46][47][48][49][50][51][52][53][54][55][56] According to the nature of their interlayer, they can generally be classified into MSPBDNs with high insulation interlayer, with high dielectric interlayer, and with gradient structure. In these three types of structure, each layer serves as a high insulation layer or a high dielectric layer to achieve high 𝜖 r and high breakdown strength simultaneously.…”

Recent progress on dielectric polymers and composites for capacitive energy storage

“…PMMA/Al 2 O 3 -P(VDF−HFP)/P(VDF−HFP) [126] ~11 0.05 600 10.03 @ 600 MV/m 75 >5×10 4 50 vol.% P(VDF-TrFE-CFE)/PI [114] 6.04 ~0.022 439.4 9.6 @ ~410 MV/m 58 PVDF/PMMA [115] 8.38 ~0.04 767.05 19.08 @ 767 MV/m ~60…”