High Energy Storage Density of Sandwich-Structured Na_0.5Bi_0.5TiO₃/PVDF Nanocomposites Enhanced by Optimizing the Dimensions of Fillers

Abstract

The dielectric behavior and mechanisms of improved energy storage density of sandwich-structured different dimensions of Na0.5Bi0.5TiO3 /PVDF composites were studied. Compared with NBT-NPs/PVDF, optimized NBT-NFs/PVDF has a greater dielectric polarization strength, so the dielectric constant of NBT-NFs/PVDF is greater than that of composite materials filled with NBT-NPs with the same volume content. With the benefit from the addition of optimized high-aspect-ratio one-dimension NBT fiber as filler and the sandwich configuration for the composites, the experimental results prove that sandwich-structured NBT-NFs/PVDF can achieve a large energy storage density of 11.7 J/cm3 at a relatively lower electric field of 350 kV/mm for the composites with 1% volume fraction of NBT-NFs in the outer layers. The stronger polarization of composites filled by NBT-NFs is proved via electric modulus and the crystallinity of the composite films. Last but not least, the study found that composite materials also have excellent stable performance and good bending cycle stability. In summary, the composite materials obtained in this study can be used in electronic components for flexible energy storage in the future.

Enhancement in the energy storage performance of P(VDF-HFP)-based composites by adding PLZST inorganic nanoparticles

“…Fig. 8 shows a comparison of the energy storage densities and efficiencies of inorganic ller/polymer matrix composites researched in recent years; 21,22,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] the specic data are shown in Table S1. † In this work, 0.5 vol% PLZST/P(VDF-HFP) lm has extremely high U e and h values compared to other inorganic ller/polymer matrix composites.…”

“…For example, at 350 kV mm −1 , the U e value of NBT-NFS/PVDF nanocomposites reached 11.7 J cm −3 . 21 Furthermore, an optimized BT/PVDF nanocomposite acquired an ultra-high U e value of 16.2 J cm −3 at 410 MV m −1 . 22 In addition, lead-based antiferroelectric ceramics show the characteristics of a remarkable dielectric constant, remarkable polarization, low hysteresis, and low loss, showing preeminent energy storage characteristics; 23,24 hence, they can also be used as nanofillers and compounded with polymers to obtain nanocomposites.…”

Optimizing nanostructures to achieve enhanced breakdown strength and improved energy storage performances in dipolar polymers

“…The charge-discharge efficiency and discharged energy density of the PVDF-390 film are compared with those of pristine PVDF films in other recently published works [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] in Fig. 13, showing that the PVDF film irradiated with 390 kGy outperforms those other pristine PVDF films.…”

Largely enhanced energy density of BOPP–OBT@CPP–BOPP sandwich-structured dielectric composites

“…These are two main patterns of the sandwich structure. The first one is to use a high-dielectric layer (soft layer) as the outer layer and a high breakdown layer (hard layer) as the middle layer, 14,[16][17][18][19][20] and the other one is on the contrary. 15,[21][22][23][24][25][26][27][28] Shen et al 29 compared the two reversed structures, namely GBG and BGB, where G-layers (soft layers) were PVDF with graphene oxide nanosheets coated with TiO 2 nanoparticles (GO-TiO 2 ), and B-layers (hard layers) were PVDF with Ba 0.6 Sr 0.4 TiO 3 (BST) nanofibers.…”