Flexible BaTiO3nf-Ag/PVDF nanocomposite films with high dielectric constant and energy density

Liu, Hongchang; Luo, Suibin; Yu, Shuhui; Ding, Shanjun; Shen, Yanbin; Sun, Rong; Wong, Ching‐Ping

doi:10.1109/tdei.2017.006297

Cited by 33 publications

(22 citation statements)

References 19 publications

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“…In recent years, various nonconducting nanoparticles with different dimensions have been introduced into polymer matrix. These nanoparticles mainly include high‐ε r ceramic nanoparticles such as BaTiO 3 , TiO 2 , ZrO 2 , (Ba x Sr 1− x )TiO 3 , CaCu 3 Ti 4 O 12 , Pb(Zr x Ti 1− x )O 3 , naturally nanosized silicate minerals (attapulgite, montmorillonite, clay), and other materials with excellent electrical and thermal properties, such as boron nitride …”

Section: High Energy Density Ceramics/polymer Nanocompositesmentioning

confidence: 99%

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Zhang

Dong

et al. 2018

Adv Materials Inter

201

112

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systems, they have numerous applications in various fields as pulsed power supply technology, [8,9] energy harvesting, [10][11][12] inverters, [13][14][15] and passive elements, [16][17][18] toward both defense and civil industries. Excellent energy storage capabilities of dielectric materials including high discharged energy density and high energy efficiency have long been eagerly pursued to meet the challenges and needs of the rapid development of modern industry, i.e., the low energy density of current dielectric materials results in overburdened capacitor volume and weight in electrical power systems. The energy storage performances of dielectric materials are usually multiply determined by three major electrical and dielectric parameters, which are categorized as:1) The breakdown strength E b ;2) The relative permittivity (also called dielectric constant) ε r or electric displacement D (the electric displacement is related to the polarization P by D = P + ε 0 E, here ε 0 = 8.85 × 10 −12 F m −1 is the vacuum permittivity); 3) The dielectric loss tanδ.In general, as illustrated in Figure 1, the discharged energy density of dielectric materials can be determined aswhere E is the applied electric field, and the energy efficiency is calculated by Dielectric polymer nanocomposites by integration of high-E b polymer matrix and high-D(ε r ) ceramic fillers have shown great potential for dielectric and energy storage applications in modern electronic and electrical systems. Interface between ceramic fillers and polymer matrix is considered as a predominant factor to determine the dielectric performances of the nanocomposites. This review analyzes the influence of the interface on dielectric responses and breakdown strength in the nanocomposites, and discusses the viability of current interface engineering strategies in improving their energy storage capabilities. Two scopes of current interface modification approaches are focused from both structural and functional considerations in the dielectric ceramics/polymer nanocomposites: first, the organic/inorganic interface compatibility can be modified to generate homogeneous dispersion of ceramic nanoparticles in polymer matrix, which is the premise of fully realizing the synergistic combination of advantages of polymer and ceramic fillers; second, regulated local electrical and dielectric behaviors in interface region enable the enhancement of dielectric properties (both high dielectric constant and high breakdown strength) in resultant nanocomposites. In the last part, some present challenges and future perspectives are proposed to utilize the interface strategy for developing high energy density ceramics/ polymer nanocomposites for dielectric and energy storage applications.

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Section: High Energy Density Ceramics/polymer Nanocompositesmentioning

confidence: 99%

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Zhang

Dong

et al. 2018

Adv Materials Inter

201

112

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“…The incorporation of Ag into the BaTiO 3 -based dielectric nanocomposites has been reported in various forms of materials, such as bulk, nanobers and thin lms, requiring moderate or high temperature processing at >160 C for densication. [20][21][22][23] For example, the nanoscale Ag/ BaTiO 3 dispersed-PVDF bulk composites exhibited 3 r $ 160 at 1 kHz when processed by hot pressing at 180 C. 20 A composite lm of Ag-coated BaTiO 3 nanober-polymer was also reported to have 3 r $ 100 at 1 kHz. 21 This work may be the very rst report dealing with room temperature processing without using complex inorganic or organic precursors.…”

Section: 19mentioning

confidence: 99%

“…[20][21][22][23] For example, the nanoscale Ag/ BaTiO 3 dispersed-PVDF bulk composites exhibited 3 r $ 160 at 1 kHz when processed by hot pressing at 180 C. 20 A composite lm of Ag-coated BaTiO 3 nanober-polymer was also reported to have 3 r $ 100 at 1 kHz. 21 This work may be the very rst report dealing with room temperature processing without using complex inorganic or organic precursors. As a promising result here, a dielectric constant of $303 with a low dielectric loss less than 0.1 was achieved for the $30 mm thick-nanocomposite lms consisting of $81 nm BaTiO 3 and $34 nm Ag nanoparticles dispersed in a UV-cured polymer matrix.…”

Section: 19mentioning

confidence: 99%

Dielectric and current–voltage characteristics of flexible Ag/BaTiO₃ nanocomposite films processed at near room temperature

et al. 2017

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High dielectric constant ceramic-polymer composite materials have been produced by thermal-treatment in the range of 160 to 200 C. Here, we introduce a room temperature process of generating flexible high dielectric constant nanocomposite films on a polymer substrate by combining a printing technique with a UV-curing process. The composite structure is based on nanoscale BaTiO 3 and Ag particles dispersed in a UV-cured polymer matrix. Dielectric characteristics of the nanocomposite thick films depended on the volume fraction and particle size of BaTiO 3 as well as the content of Ag. As an optimal result, a dielectric constant of $300 and a dielectric loss of 0.08 were achieved when $81 nm BaTiO 3 and $34 nm Ag particles were used in a total volume fraction of 56.2%, which are very competitive for flexible capacitive devices. Current-voltage behavior of the nanocomposite films depended largely on the content of Ag content as related to the percolative transition of electrical conduction.

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“…In recent years, in order to extend the application of PVDF into more fields, advanced PVDF nanocomposites with modified dielectric properties achieved by introducing various high dielectric constant fillers, such as ceramics, semiconductor, metal particles, graphene and carbon nanotubes (CNT), into PVDF matrix have been investigated. [11][12][13][14][15][16][17][18][19][20] Generally, the introduction of ceramic and metal fillers led to a reduction of the flexibility while the increased dielectric constant values obtained from these composites were only several hundreds. [13][14][15][16][17] PVDF nanocomposites filled with CNT showed dramatically enhanced dielectric permittivity at some frequency level.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20] Generally, the introduction of ceramic and metal fillers led to a reduction of the flexibility while the increased dielectric constant values obtained from these composites were only several hundreds. [13][14][15][16][17] PVDF nanocomposites filled with CNT showed dramatically enhanced dielectric permittivity at some frequency level. [18][19] For example, when the chemically purified multiwalled CNT were used as nanofillers, the PVDF nanocomposites demonstrated remarkably enhanced dielectric constant, for example, 3,600 at 1 kHz, was obtained from the PVDF composite with 8.0 vol% MWCNT.…”

Section: Introductionmentioning

confidence: 99%

Negative dielectric permittivity of PVDF nanocomposites induced by carbon nanofibers and polymer crystallization

Sun

Peng

2020

J of Applied Polymer Sci

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Negative permittivity is a key characteristic of the distinctive metamaterials, a novel class of artificial materials with particular electromagnetic properties. Negative permittivity has been realized in metallic structures with special designs, but rarely achieved in polymer nanocomposites. Our recent studies discover that negative permittivity can be attained from randomly distributed carbon nanofiber (CNF) filled poly(vinylidene fluoride) (PVDF) composites over a wide frequency range, and the negative permittivity values are strongly influenced by CNF and PVDF crystalline structures. The effects of CNF on the crystallization of PVDF, and the resultant negative dielectric permittivity of CNF/PVDF composites influenced by crystallization of PVDF and CNF, are investigated. It is revealed that the introduction of CNF not only affects the dielectric permittivity directly, but also causes indirect effects to the dielectric permittivity through influencing the crystallization of PVDF. In particular, due to addition of more CNF, a α‐ to β‐phase transformation in PVDF is found to affect permittivity of the nanocomposites. Furthermore, the permittivity of CNF/PVDF composites are increased considerably (“more negative”) with more CNF, and is affected noticeably by crystalline structures of PVDF. The lowest negative permittivity achieved is −2,500 for the nanocomposite with 5 wt% CNF at 5 kHz.

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Flexible BaTiO3nf-Ag/PVDF nanocomposite films with high dielectric constant and energy density

Cited by 33 publications

References 19 publications

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Dielectric and current–voltage characteristics of flexible Ag/BaTiO₃ nanocomposite films processed at near room temperature

Negative dielectric permittivity of PVDF nanocomposites induced by carbon nanofibers and polymer crystallization

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Flexible BaTiO3nf-Ag/PVDF nanocomposite films with high dielectric constant and energy density

Cited by 33 publications

References 19 publications

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Dielectric and current–voltage characteristics of flexible Ag/BaTiO3 nanocomposite films processed at near room temperature

Negative dielectric permittivity of PVDF nanocomposites induced by carbon nanofibers and polymer crystallization

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Dielectric and current–voltage characteristics of flexible Ag/BaTiO₃ nanocomposite films processed at near room temperature