Improved Dielectric Permittivity and Energy Density of Layered Polymer Composites through the Incorporation of Ultralow Amounts of RGO@BTO Hybrid Nanosheets

Abstract

Polymer dielectric composites are extensively used in modern electronic devices because of their extremely high power density. However, unfavorable coupling between breakdown strength and dielectric permittivity can make achieving high energy density a challenge. In this study, reduced graphene oxide @ barium titanate (RGO@BTO) hybrid nanosheets have been fabricated and utilized as fillers in the design of RGO@BTO/P(VDF-HFP) single-layer films. An increase in permittivity to 24.8@10 kHz, i.e., equivalent to 253% of the P(VDF-HFP) (∼9.8@10 kHz) matrix, has been achieved with only 1 wt % RGO@BTO nanofillers due to the formation of microcapacitors. Furthermore, the RGO@BTO/P(VDF-HFP) film is hot-pressed with a PEI film and a P(VDF-HFP) film, forming a trilayer structure. Consequently, this trilayer film displays a high breakdown strength of 478 kV/mm, a high energy density of 8.25 J/cm 3 , and a satisfactory efficiency of 64.3%. Thus, this study provides an efficient route for designing polymer composites that combine high energy density with high permittivity.

Achieving remarkable energy storage enhancement in polymer dielectrics via constructing an ultrathin Coulomb blockade layer of gold nanoparticles

“…2(g), the peaks at 18.3° and 19.7° correspond well with the (100) and (020) crystal planes of α -P(VDF–HFP), respectively. 29 And the crystal structure of P(VDF–HFP) does not change after sputtering. As shown in Fig.…”

Electrochemical Energy Storage and Conversion Applications of Graphene Oxide: A Review

“…Similar work has been reported on the composite of RGO@barium titanate (RGO@BTO) hybrid nanosheets with poly­(vinylidene fluoride–hexafluoropropylene) [P­(VDF–HFP)]. Here, BTO behaves as insulating media, RGO behaves as the conducting electrode, and P­(VDF–HFP) shows a higher dielectric permittivity and decent flexibility . This fabricated trilayer composite film was able to enhance the breakdown strength and electric field redistribution significantly because of the charge migration barrier effect .…”

“…Here, BTO behaves as insulating media, RGO behaves as the conducting electrode, and P(VDF−HFP) shows a higher dielectric permittivity and decent flexibility. 221 This fabricated trilayer composite film was able to enhance the breakdown strength and electric field redistribution significantly because of the charge migration barrier effect. 221 RGO has shown its encouraging ability in dielectric capacitors as a result of its crucial properties, such as a high surface area, tremendous electrical conductivity, and chemical stability.…”

“…221 This fabricated trilayer composite film was able to enhance the breakdown strength and electric field redistribution significantly because of the charge migration barrier effect. 221 RGO has shown its encouraging ability in dielectric capacitors as a result of its crucial properties, such as a high surface area, tremendous electrical conductivity, and chemical stability. Yin et al 222 have reported a new method for improving the dielectric properties of the PVDF/RGO composite by in situ ball milling (ISBM) and an extensional flow field.…”

Remarkably enhancing dielectric permittivity and suppressing loss of PVDF via incorporating metal nanoparticles decorated glass fibers

“…In recent years, researchers put their effort into addressing this problematic issue through surface modification (e.g. core shell structure) of conductive particles or indirect loading method to improve the interaction between fillers and polymer matrix [3,[19][20][21]. However, there has been no substantial reduction in loss through current methods, becoming a bottleneck for the development of conductor/polymer composites.…”