APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 6
·1-14
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IF 1.784
Chen Gang,Fan Tao,Yang Hongqi,Fu Chunlin,Gao Rongli,Deng Xiaolin,Wang Zhenhua,Fan Peigeng,Cai Wei
(1 − x )BaTiO 3 – x BiAlO 3 relaxor ferroelectric ceramics were prepared by the conventional sintering (CS) and the microwave sintering (MWS) methods, respectively. The microstructure, the dielectric properties, the relaxation characteristic, the ferroelectric and the energy storage properties were investigated in detail. The results show that a single perovskite phase exists in ceramic samples sintered by CS and MWS. The addition of BiAlO 3 into BaTiO 3 and the MWS method result in the reduction of the grain size and the porosity of BaTiO 3 ceramic. This leads to the enhanced diffuse transition and frequency dispersion. The dielectric constant and loss decrease with increasing the BiAlO 3 content, and the temperature and the frequency stabilities are enhanced by introducing BiAlO 3 into BaTiO 3 . The remnant polarization ( P r ) increases initially and then decreases with the increase of BiAlO 3 content, the maximum values of P r (9.5 μC/cm 2 for CS and 7.27 μC/cm 2 for MWS) are obtained at x = 0.02. The addition of BiAlO 3 can elevate the variation of polarization Δ P ( P max − P r ), its maximum values (12.56 μC/cm 2 for CS ceramic and 12.2 μC/cm 2 for MWS ceramic) are acquired at x = 0.04, 0.08, respectively. The energy storage properties indicate that the energy storage density ( W rec ) increases, while the energy storage efficiency ( η ) firstly decreases and then increases with the increase of x .
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COMPOSITES SCIENCE AND TECHNOLOGY
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2018
·
IF 5.16
Zeyu Li,Feihua Liu,Guang Yang,He Li,Lijie Dong,Chuanxi Xiong,Qing Wang
Polymer nanocomposite dielectrics with high energy densities have shown great potential in electrical energy storage applications. However, these high energy densities are normally achieved at ultrahigh applied electric fields (≥400 MV/m), which is inconvenient for certain applications such as aerospace power systems and microelectronics. In this study, uniform BaTiO 3 nanofibers (BT nfs) with a large aspect ratio were prepared via the electrospinning method , surface modified by poly(vinyl pyrrolidone) (PVP) and utilized as the fillers in the poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) nanocomposites. It is found that the nanocomposite with 3 vol% BT nfs possesses a much enhanced discharged energy density of 8.55 J/cm 3 at an applied electric field of 300 MV/m, which is 43% higher than that of the neat polymer matrix (i.e. 5.98 J/cm 3 ) and more than four times that of the commercial biaxial oriented polypropylene dielectric (2 J/cm 3 at over 600 MV/m). Comparative studies have been performed on the corresponding nanocomposites with BT nanoparticle fillers and pristine BT nfs. The improved energy storage performance is ascribed to the synergetic effects of surface modification and large aspect ratio of BT nfs. Our research provides a facile and effective approach to high-performance electrical energy storage materials which work efficiently at relatively low operating voltages.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Ze-Hui Dai,Ting Li,Yang Gao,Jun Xu,Jinliang He,Yunxuan Weng,Bao-Hua Guo
Polymer nanocomposite dielectrics have drawn increasing attention recent years. However, dispersion of high- ε nanoparticles causes decreased breakdown strength and increased loss tangent . High dielectric permittivity, high breakdown strength , low dielectric loss and high charging-discharging energy efficiency are hard to achieve at the same time. In this research, in order to achieve all these goals, a combination method consists of cross-linking and dispersion of high- ε nanoparticles was carried out. The cross-linking points limit polymer chain mobility in the amorphous phase, providing lower dielectric loss and lower conductivity. Therefore, breakdown strength increased from 402.8 MV/m of PVDF to 517.2 MV/m of cross-linked PVDF. By dispersing coated BaTiO 3 nanoparticles, followed by cross-linking, cross-linked nanocomposites with higher ε , higher breakdown strength and higher efficiency compared with the polymer matrix were prepared. The maximum discharging energy density reached up to 14.1 J/cm 3 , about 70% higher than 8.02 J/cm 3 for pristine PVDF. This research provides us a novel approach to achieve all these goals by a combination of cross-linking and dispersion of coated BT nanoparticles.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Xianhong Zhang,Cheng Tan,Yuhong Ma,Fang Wang,Wantai Yang
This work reports a new three-component composite which is consisted of dielectric carbon coated barium titanate hybrid particles (BT@C), thermal conductive silicon carbide nanoparticles (SiC NPs), and flexible poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP). The BT@C is synthesized via hydrothermal reaction of BT nanoparticles with glucose and further carbonized at 800 °C. The TEM images and Raman spectra reveal that the structure of carbon coating layer is high ordering graphitic carbon . Compared with the two-component BT@C/PVDF-HFP and SiC/PVDF-HFP composites, the three-component BT@C/SiC/PVDF-HFP composites show a positive synergistic effect of the two fillers in enhancing not only thermal conductivity but also dielectric constant. The results show that with the addition of 5.5 wt% and 10 wt% SiC NPs into BT@C-2(50 wt%)/PVDF-HFP composite, the thermal conductivity increases to 0.69 W m −1 k −1 and 0.92 W m −1 k −1 respectively (0.61 W m −1 k −1 as control). For dielectric performance, the dielectric constant of BT@C-2(50 wt%)/PVDF-HFP increases from 80 to 1394 at 1 kHz with addition of 7.8 wt% SiC NPs. The dielectric constant is almost 158 times greater than that of pure PVDF-HFP (8.8, measured) and the dielectric loss tanδ is 0.9. These results show a good balance of dielectric performance. This method offers us a potential for the design and fabrication of polymeric dielectric composites which could be applied in electronic devices.
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ACS Omega
·
2018
·
IF 0
Dan Yang,Xinxin Kong,Yufeng Ni,Yingjie Xu,Shuo Huang,Guangjie Shang,Hao Xue,Wenli Guo,Liqun Zhang
We demonstrate the synthesis of a novel core–satellite-structured BaTiO3–poly(dopamine)–silver (BT–PDA–Ag) nanoparticle for improving dielectric properties of nitrile-butadiene rubber (NBR) nanocomposites. The BT–PDA–Ag nanoparticles are synthesized by dopamine oxidative polymerization and electroless plating of silver. The Ag nanoparticles decorated on the BT nanoparticles enhanced the dielectric constant of NBR nanocomposites due to the increased conductivity of the filler/matrix interlayer and nanocapacitor structure. In addition, the incorporation of the BT nanoparticles prevented the continuous connection of Ag nanoparticles and suppressed the formation of a conductive path in the NBR matrix. Moreover, the ultrasmall Ag nanoparticles trapped the carriers by Coulomb blockade and quantum confinement effects, which results in low dielectric loss and electrical conductivity of nanocomposites. The proposed method with simplicity and scalability can be adapted to process high-dielectric polymer nanocomposites.
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PubMed
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Keyu Chen,Ruiqi He,Jiacheng Guo,Lu Ye,Xi Chen,Changning Ran,Xinrui Yan,Jianjun Zhang,Sude Ma
(1- x ) BaTiO 3 – x Bi(Mg 0.25 Zn 0.25 Ti 0.5 )O 3 ( x = 0.00, 0.06, 0.12, 0.20,molar ratio) ceramics were prepared by solid sintering method. The effects of Bi(Mg 0.25 Zn 0.25 Ti 0.5 )O 3 (BMZT) doping on microstructure, dielectric, ferroelectric and energy storage properties of BaTiO 3 (BTO) were studied. With BMZT addition, the sintering temperature gradually decreases, the grain size reaches a minimum at x = 0.12 and the phase structure changes from tetragonal to cubic. And dielectric properties changed from temperature-dependent to temperature-insensitive. Additionally, higher cubic phase content induced slim polarization and electric field (P-E) loop and low remnant polarization (P r ). Therefore, 0.88 BaTiO 3 - 0.12 Bi(Mg 0.25 Zn 0.25 Ti 0.5 )O 3 ceramics achieved recoverable energy storage density (W rec ) of 702.7 mJ/cm 3 and high energy efficiency of 87.3 % under electric field of 93 kV/cm. It exhibited optimum properties, including a minimum grain size (0.620 μm), superior dielectric properties (ε r = 1811.3, tanδ = 0.0552 at 1150 °C), a high maximum polarization strength (14.3 μC/cm 2 ), and the maximum dielectric breakdown strength (93 kV/cm), as identified in the present study. It simultaneously maintains high energy storage density and efficiency over a wide electric field range and large temperature range (room temperature - 90 °C). Thus (1- x ) BaTiO 3 – x Bi(Mg 0.25 Zn 0.25 Ti 0.5 )O 3 ceramics are a promising material for energy storage applications.
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Journal of Materials Chemistry A
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2025
·
IF 9.5
Peng Yin,Xiaohan Bie,Qingyang Tang,Linwei Zhu,Runhua Fan,Davoud Dastan,Hongzhi Cui,Kun Zhang,Zhicheng Shi
Polymer dielectrics characterized by high power density, fast discharge rate and reliability are critical in pulse energy storage systems. However, the low discharge energy density (Ud) of polymer dielectrics, stemming from the inverse coupling between dielectric constant (εr) and breakdown strength (Eb), renders them insufficient to meet miniaturized requirements of modern electronics. To address this challenge, we propose constructing dual interfacial gold nanodot interlayers within a barium titanate (BT)/poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) trilayer composite (BT-3L) to synergistically enhance its εr and Eb, ultimately achieving high Ud. Specifically, dual gold nanodot interlayers are anchored at the interface between the P(VDF-HFP) outer layer and the BT/P(VDF-HFP) middle layer via sputtering and hot-pressing processes. Benefiting from the interfacial polarization and Coulomb blockade effect induced by gold nanodots, the concurrently enhanced εr of 12.9 at 10 kHz and Eb of 520.08 MV m−1 are achieved. Consequently, a significantly improved Ud of 14.78 J cm−3, which is approximately 176.4% that of the BT-3L composite (∼8.38 J cm−3), is further realized in this composite with dual gold nanodot interlayers. This work provides a promising approach for designing high-performance multilayer dielectric composites.
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POLYMER COMPOSITES
·
2024
·
IF 4.8
Weiji Li,Xinrui Yan,Lu Ye,Changning Ran,Yue Zhang,Ruiqi He,Bixuan Zhu,Yu He,Jiacheng Guo,Hongwei Li,Jianjun Zhang,Sude Ma
In this paper, the carboxylic acid modifier 2,3,4,5-tetrafluorobenzoic acid (F4C) was used to modify the BaTiO 3 (BT) nanoparticles, which acted as a coupling agent. The modified BT(F4CBT) nanoparticles, polyvinylidene fluoride (PVDF), and polymethylmethacrylate (PMMA) were used to make the modified nanocomposite films: PVDF/PMMA-F4C-BaTiO 3 nanocomposite films. The unmodified BT nanoparticles were used to make the unmodified nanocomposite films: PVDF/PMMA-BaTiO 3 nanocomposite films. The modification effect of the F4C resulted in an increase in the amount of β-phase and γ-phase, a decrease in the amount of α-phase, and a decrease in the overall crystallinity of the PVDF-based nanocomposite films. The dielectric constant of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 16.7 at a frequency of 100 Hz at 4 wt% F4C, which was 40.3% higher than that of the unmodified PVDF/PMMA-BaTiO 3 films. The F4C content of 2 wt% PVDF/PMMA-F4C-BaTiO 3 nanocomposite films showed the lowest dielectric loss of 0.055, which was 56.7% lower than the unmodified PVDF/PMMA-BaTiO 3 films. The breakdown strength of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films increased and then decreased with the increase of the F4C content, and the highest breakdown strength was 2800 kV/cm at 4 wt% F4C, which was 55.6% higher than the unmodified PVDF/PMMA-BaTiO 3 films. The charging density of the PVDF/PMMA-F4C-BaTiO 3 nanocomposite films reached a maximum value of 20.65 J/cm 3 at 4 wt% F4C content, which was 394% higher than the unmodified PVDF/PMMA-BaTiO 3 films. Highlights Modification of ceramic nanoparticles with carboxylic acid coupling agent. The dielectric properties of the modified nanocomposite film were significantly improved. Maximum polarization and charge/discharge density were greatly improved by coupling agent modification.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Quan,Li Lei,Shuimiao Xia,Qinyang Tang,Zelong Chang,Linwei Zhu,Davoud Dastan,Zhicheng Shi
Polymer composites filled with conductive fillers have been proven to have ultra-high effective permittivity near percolation, but they usually have high dielectric loss due to the easy contact between the conductive fillers. Herein, a polymer composite with a three-dimensional BaTiO 3 ceramic skeleton loaded with gold nanoparticles, which effectively avoids the direct contact of gold nanoparticles, is proposed. Benefiting from numerous equivalent micro-capacitors and the Coulomb blockade effect of gold nanoparticles, obviously enhanced permittivity and low loss are concurrently achieved. Particularly, with a gold sputtering time of 12 min, a high permittivity of 47.7@10 kHz, which is approximately 454 % (i.e. from 8.2 to 47.7@10 kHz) of the PVDF matrix, is achieved in the composite. Meanwhile, a low loss of about 0.032, which is merely about 65 % that of pure PVDF ( 0.0492@10 kHz) is maintained. This work provides an effective approach for designing polymer composites with high permittivity and low loss.
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Nano Energy
·
2021
·
IF 17.881
Rui Li,Guoqiang Zhang,Yingtao Wang,Zhangwen Lin,Chuanxin He,Yongliang Li,Xiangzhong Ren,Peixin Zhang,Hongwei Mi
Acceleration of reaction kinetics is urgently pursued for high-rate sodium ion batteries, while the utilization of ferroelectric and piezoelectric effect to form local micro electric field to facilitate ion transport has rarely been reported. Herein, a coherent tin oxide/barium titanate heterostructure encapsulated inside nitrogen-doped carbon nanofibers (SnO 2 /BaTiO 3 @NCNF) is introduced as sodium ion battery anode, exhibiting high capacity retention (82% over 2000 cycles at 2 A g 1 ) and stunning long-term cyclability (183.4 mAh g 1 after 10,000 cycles at 5 A g 1 ). The local potential produced by piezoelectric and ferroelectric effect of BaTiO 3 (BTO) can boost sodium ion diffusion kinetics and promote rate performance of SnO 2 anode. The piezoelectric effect is initiated from exploiting the drawback of volume expansion of SnO 2 , while the ferroelectric effect is originated from the charge separation of polarized BTO particles under external electric field. Such principle is instructive for alloying-type and convention-type anodes of alkali-ion batteries.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bin Zhang,Xiao-ming Chen,Wen-wen Wu,Amir Khesro,Peng Liu,Minmin Mao,Kaixin Song,Rong Sun,Dawei Wang
Dielectric polymer nanocomposite films have been widely studied because of their high polarization and electric breakdown strength, leading to high discharge energy density (U d ). However, nanocomposites with high U d often show low discharge energy efficiency (η). In order to achieve both high U d and η simultaneously, a series of novel bilayer polymer nanocomposite films composed of pure polyetherimide (PEI) layer and BaTiO 3 -dispersed poly(1,1-difluoroethylene) (BT/PVDF) layer were prepared by hot-pressing method in this work. The bilayer composites exhibit high η > 84% at 600 MV⋅m −1 , which are much larger than most reported values (η < 70%). Specially, the highest η of 84.48% and U d of 8 J·cm −3 at 600 MV·m −1 were obtained for the bilayer films composed of PEI and 3 vol% BT/PVDF layers, which is promising for pulsed power applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Manting Zeng,Xingzhong Liu,Hua Hao,Zhonghua Yao,Hanxing Liu
BaTiO 3 -1.6MnO 2 - x Er 2 O 3 ceramics (abbreviated as BMT- x Er) and BaTiO 3 -1.6MnO 2 -3Er 2 O 3 - x MgO ceramics (abbreviated as BEMT- x Mg) were prepared under a reducing atmosphere by solid-state synthesis method in this work. The effects of Er/Mg co-doping on phase transformation, microstructure, dielectric properties, and defect were systematically investigated. Research shows that Er-doping reduces the Curie temperature and increases the dielectric constant of BaTiO 3 ceramics at low temperatures. Mg-doping refines the grain size and makes the grain size distribution more uniform, which is an important reason for the enhanced bias stability. The substitution of Mg at the B-site generates additional oxygen vacancies which capture free electrons and simultaneously forms defect dipoles. The anti-reducing properties are improved by reducing the carrier concentration. The synergistic effect of co-doping forms defect dipoles such as [ Mg Ti ″ ‐ 2 Er Ba ∙ ] , [ Mg Ti ″ ‐ V O ∙ ∙ ] and [ 2 Er Ti ′ ‐ V O ∙ ∙ ] to enhance dielectric relaxation behavior which is considered to be the reason for the improved dielectric temperature stability. When x = 0.4, optimized dielectric ceramics are obtained with ε 25°C = 1820, tanδ = 0.009, resistivity of 1.0 × 10 11 Ω·cm, which meets the EIA X7R standard (−55 °C - 125 °C, TCC ≤ ± 15 %).
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