Highly enhanced dielectric strength and energy storage density in hydantoin@BaTiO₃–P(VDF-HFP) composites with a sandwich-structure

Abstract

A sandwich-structured composite consisted of a pure poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) central layer and two BaTiO 3 -P(VDF-HFP) neighboring layers was developed for high energy storage density. The sandwiched structure effectively enhanced dielectric properties and energy storage capacity of the composites. Breakdown strength and energy storage density of the composite with 35 vol% P(VDF-HFP) central layer reached 315 kV mm -1 and 5.22 J cm -3 , which were enhanced by 68% and 125% compared to 187 kV mm -1 and 2.32 J cm -3 of the single layer composite, respectively. The dielectric constant of the composites with sandwich-structure was approximately 3 times higher than the pure P(VDF-HFP) and the dielectric loss was as low as 0.026 at 1 kHz. These results demonstrated that the sandwich-structured ceramics/polymer composite was an effective way to produce high energy density composites.

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

“…It consists of a pure poly(vinylidene fluoride‐co‐hexafluoropropylene (P(VDF–HFP)) central layer and BaTiO 3 /P(VDF–HFP) upper and lower layers using a spin‐coating process. [ 205–207 ] However, this type of sandwich‐structured composite often suffers from a low relative permittivity, and polarization due to the central polymer layer having low permittivity, and also process complexity for scale‐up.…”

Enhancement of dielectric properties and energy storage density in poly(vinylidene fluoride-co-hexafluoropropylene) by relaxor ferroelectric ceramics

“…It can be seen that the J can be increased by simultaneously increasing dielectric constant and breakdown strength. [17][18][19] While the ferroelectric ceramics always suffer from fat hysteresis loops with high coercive electric field and high remanent polarization, which would decrease the discharged energy density and energy efficiency. 16 Generally, ferroelectric ceramics, such as Pb(Zr, Ti)O 3 (PZT), BaTiO 3 , etc., have often been chosen as the fillers in polymer composites due to their high dielectric constants.…”

Significantly Enhanced Energy Storage Density by Modulating the Aspect Ratio of BaTiO3 Nanofibers

“…In recent decades, an number of efforts have been made to fabricate ceramics/polymer nanocomposites to overcome this limitation131415. The nanocomposite systems combine the high permittivity of ceramics with the high breakdown strength, low dielectric loss, and mechanical flexibility of polymers.…”