Gradient design of ultrasmall dielectric nanofillers for PVDF-based high energy-density composite capacitors

Hao, Yanan; Feng, Zunpeng; He, Zhengda; Zhang, Jiameng; Liu, Xiaoming; Qin, Jing; Guo, Limin; Bi, Ke

doi:10.1016/j.matdes.2020.108523

Cited by 53 publications

(21 citation statements)

References 32 publications

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“…To make a more comprehensive comparison of the energy storage properties between inorganic filler/polymer matrix composites and the all-organic composite, relevant studies are shown in Figure . ,− The breakdown strength of the inorganic filler/polymer matrix composites is mostly concentrated below 550 kV mm –1 with a lower energy storage efficiency, as shown in Figure , which is greatly related to the defects generated by the introduction of inorganic fillers. The all-organic composite in this work can effectively avoid the generation of similar defects, achieve a higher breakdown strength, and maintain high efficiency, which makes it have a higher energy storage density although without a higher dielectric constant like inorganic filler/polymer matrix composites.…”

Section: Resultsmentioning

confidence: 99%

Significantly Improved Energy Storage Performance of PVDF Ferroelectric Films by Blending PMMA and Filling PCBM

Zhang

Feng

et al. 2021

ACS Sustainable Chem. Eng.

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The increasing energy problem and the demand of environmental protection raise higher requirements for the development of clean energy. Dielectric capacitors have attracted lots of attention as a supporting facility of energy storage and conversion for clean energy, but their further development is limited by the low energy storage performance. In this paper, all-organic composite dielectrics were reported, with a poly(methyl methacrylate) (PMMA)/poly(vinylidene fluoride) (PVDF) composite dielectric with different mixing ratios as the matrix and the organic molecular semiconductor with high electron affinity [6,6]-phenyl C61 butyrate acid methyl ester (abbreviated as PCBM) as fillers. The related test results show that with the increase in the doping contents of PCBM, the energy storage density increases obviously. When the doping content of PCBM is 0.9 wt %, the PMMA/PVDF-based organic composite dielectric possesses an optimal breakdown field of 685.67 kV mm–1, accompanying excellent energy storage performances (Ue , ∼21.89 J cm–3; η, ∼70.34%). The PVDF blended with PMMA strategy not only restrains the ferroelectric polarization loss of PVDF but also improves the breakdown strength of the polymer. More importantly, the polarization and breakdown strength of the composites can be synergistically enhanced by filling with PCBM fillers.

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Section: Resultsmentioning

confidence: 99%

Significantly Improved Energy Storage Performance of PVDF Ferroelectric Films by Blending PMMA and Filling PCBM

Zhang

Feng

et al. 2021

ACS Sustainable Chem. Eng.

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“…The maximum ε r of a 3 wt % PPDI/PVTC polymer blending film under 100 Hz is 33, which is an augment of 32% compared to the pure PVTC polymer. On the one hand, electrons will accumulate at the surface of PPDI nanoparticles according to the Maxwell–Wagner effect, which will lead to enhancing interfacial polarization due to the difference of electron mobility between the PVTC matrix and organic polymer filler PPDI. − In addition, semiconductive polymer PPDI possesses significantly higher electron affinities than dielectric polymer PVTC, which can catch the injected electrons by the large electrostatic attraction. The schematic diagram of charge distribution is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

n-Type Semiconductive Polymer and Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) Blends for Energy Storage Applications

Qiao

Chen

et al. 2021

ACS Appl. Polym. Mater.

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Dielectric polymers play a vital role in modern electronic and electrical application because of easy processing, light weight, and high breakdown strength. A high dielectric constant (εr) and breakdown strength cannot be satisfied simultaneously in the dielectric homopolymers. Via combining the merits of different polymers, the dielectric polymer blending method is a feasible option to address this issue. In this paper, n-type semiconductive polymer poly(1,6,7,12-tetra-chlorinated perylene-N-2-aminoethyl acrylate-N′-dodecylamine-3,4,9,10-tetracarboxylic bisimide) (PPDI) and relaxor ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (PVTC) were utilized to prepare the dielectric polymer blends because PPDI had the characteristic of binding electrons and PVTC possessed a high εr. A series of polymer blends with different weight ratios of PPDI were fabricated to investigate the loading effect of an n-type semiconductive polymer on the dielectric and energy storage properties of PPDI/PVTC blends. The experimental results showed that, when the loading was below 3 wt %, the εr of polymer blends increased from 25 to 33 at 102 Hz with the increasing content of polymer PPDI and then decreased from 33 to 7 with the increasing concentration from 3 to 40 wt %. The dielectric behavior of polymer blends was related to the dispersion of organic fillers and interface polarization. Additionally, a low dielectric loss was found in all polymer blending films. A maximal discharge energy density of 4.42 J/cm–3 was achieved in the 4.5 wt % PPDI/PVTC blending film at 200 kV/mm–1. The finding presents an innovative idea to synthesize high-performance all-organic dielectric materials.

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“…For comparison, the U d and η of previously reported representative monolayer composites are summarized in Figure . ,,,,− In brief, the red part presents high energy density, while the blue part presents high efficiency. Hence, the optimal energy storage properties of composites ought to be presented in the direction of the green arrow.…”

Section: Resultsmentioning

confidence: 99%

Ultra-Fine Gold Nanoparticles Enabled Au-BST NF/PVTC Composites to Have Excellent Energy Storage Performance

Xiong

Zhang

Yang

2021

ACS Appl. Energy Mater.

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Composites composed of a polymer matrix and inorganic fillers have attracted tremendous attention owing to their promising application in flexible dielectric film capacitors. However, boosting the energy density while ensuring a high charging-discharging efficiency is still a huge challenge. In this work, Ba0.6Sr0.4TiO3 nanofibers (BST NFs) doped with different contents of ultra-fine Au nanoparticles are precisely prepared by one-step electrospinning, and P(VDF-TrFE-CFE) (PVTC)-based composites incorporated with various nanofibers are further prepared via a solution-casting process. A superior discharged energy density of 14.2 J/cm3 and an excellent energy storage efficiency of 71.3% have been achieved in such monolayer composites by optimizing the doping content and distribution of ultra-fine Au nanoparticles in BST NFs, which are induced by enhanced electric displacement and ensure suppressed energy loss and improved electric breakdown strength. Hence, doping moderate ultra-fine metal nanoparticles in one-dimensional inorganic nanofillers is a feasible strategy for designing polymer-based composites with outstanding performance.

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Gradient design of ultrasmall dielectric nanofillers for PVDF-based high energy-density composite capacitors

Cited by 53 publications

References 32 publications

Significantly Improved Energy Storage Performance of PVDF Ferroelectric Films by Blending PMMA and Filling PCBM

Significantly Improved Energy Storage Performance of PVDF Ferroelectric Films by Blending PMMA and Filling PCBM

n-Type Semiconductive Polymer and Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) Blends for Energy Storage Applications

Ultra-Fine Gold Nanoparticles Enabled Au-BST NF/PVTC Composites to Have Excellent Energy Storage Performance

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