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Journal of Materials Science & Technology 2021年第15期74卷 1-10页

作者： Baoquan Wan Haiyu Li Yunhui Xiao Zhongbin Pan Qiwei Zhang Inner Mongolia Key Laboratory of Ferroelectric-related New Energy Materials and Devices Inner Mongolia University of Science and Technology.7#Arding StreetKun DistrictBaotou 014010China School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315000ZhejiangChina Key Laboratory of Integrated Exploitation ofBayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China

Conventionally,interface effects between polymers and fillers are essential for determining the breakdown strength and energy storage density of polymer-based dielectric *** this study,we found that interface effects between different fillers have similar *** and Ba TiO3 fiber composite fillers with three different interface bonding strengths were successfully achieved by controlling composite processes(BT-fiber/BNbreakdown strength and energy storage density were obtained in BT-fiber&BN/PI composites owing to strong interface bonding,compared to other two composite fillers,which are well supported by the data from the finite element ***,PI composites with only 3 wt%BT-fiber&BN possess an optimized energy storage density of approximately 4.25 J/cm^(3)at 4343 k V/*** results provide an effective way for adjusting and improving the energy storage properties of polymer-based composites.

关键词： Interface effects breakdown strength Energy storage density Polyimide

Simultaneously Improved Dielectric Constant and breakdown strength of PVDF-based Composites with Polypyrrole Nanowire Encapsuled Molybdenum Disulfide Nanosheets

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Chinese Journal of Polymer Science 2022年第5期40卷 515-525页

作者： Hua-Bin Luo Xiao-Ren Pan Jing-Hui Yang Xiao-Dong Qi Yong Wang School of Materials Science&Engineering Key Laboratory of Advanced Technology of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031China

High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy *** rational structural design of hybrid fillers can lead to a balance between high dielectric constant and insulation in *** this work,novel hybrid fillers were fabricated by in situ synthesizing one-dimensional polypyrrole nanowires(PPynws)on the twodimensional molybdenum disulfide(MoS_(2)),which integrated the good ion polarization ability of PPynws and the high insulation and adjustable band gap of MoS_(2).Compared with the binary poly(vinylidene fluoride)(PVDF)/MoS_(2) composites,the PVDF/MoS_(2)-PPynws composites exhibited remarkably improved dielectric constant and breakdown strength,while the dielectric loss was still maintained at a low *** optimal ternary composite with 1 wt%MoS_(2)-PPynws showed a high dielectric constant(15@1kHz),suppressed dielectric loss(0.027@1kHz),and high breakdown strength(422.1 MV/m).PPynws inducing strong interfacial polarization and the highly insulated MoS_(2) nanosheets extending the breakdown path mainly contributed to the synchronously enhanced dielectric constant and breakdown *** intriguing synthesis method of PVDF/MoS_(2)-PPynws nanocomposite will open up new opportunities for fabricating nanostructured polymer composites to produce high dielectric materials.

关键词： Hybrid fillers Molybdenum disulfide Polypyrrole nanowires Dielectric composites breakdown strength

Polarity Effects of Propylene Carbonate on breakdown strength in Microsecond Range

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Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： Zhen Wang Zi-cheng Zhang Jian-de Zhang College of Opto-electronic Science and Engineering National University of Defense Technology Changsha 410073 China

We investigate the polarity effects of the propylene carbonate on the breakdown voltage using the needle-plate electrodes with gaps of 0.5, 1.0, and 2.0 mm. The devices used in this study involve a compact capacitive-energy-storage pulse power source with charging time varying from 5 ms to 20 ms and a test cell with the needle-plate electrodes. The breakdown voltage is recorded by a digital oscilloscope for each gap. The results of these three groups indicate that the positive breakdown voltage is higher than the negative one and the breakdown voltage of the PC increases with the ascending electrode gap. In addition, a simulation is conducted to support this experiment. Some explanations about the polarity effect of the PC are also given.

关键词： breakdown strength Propylene carbonate Polarity effect

Development of epoxy resin with superior breakdown strength:A Review

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iEnergy 2024年第2期3卷 82-94,I0001页

作者： Li Shengtao Li Mingru State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityShaanxi 710049China

Epoxy resin(EP)has been widely utilized in electrical equipment and electronic devices due to its fascinating electric,thermal,and mechanical ***,the complex insulation structures of modern power devices in high-voltage direct current systems pose several challenges for EP-based *** most significant among these challenges is the need for EP to stably operate under greater electric fields,requiring superior breakdown *** paper summarizes the key factors influencing the breakdown strength of EP and reviews reported methods for enhancing this *** the limitations of existing approaches,we propose that the emerging technology of molecule design offers a potentially optimal solution for developing EP with enhanced breakdown ***,we anticipate the future development direction of EP with satisfactory insulation *** believe that enhancing the breakdown theory of solid dielectrics,exploring new research and development methodologies,and creating environmentally friendly EP with high performance are primary focus *** hope that this paper will offer guidance and support for the future development of EP with superior breakdown strength,proving valuable in advancing EP-based dielectrics.

关键词： Epoxy resin breakdown strength electrical insulation

Ternary polymer nanocomposites with concurrently enhanced dielectric constant and breakdown strength for high-temperature electrostatic capacitors

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InfoMat 2020年第2期2卷 389-400页

作者： He Li Lulu Ren Ding Ai Zhubing Han Yang Liu Bin Yao Qing Wang Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPennsylvania State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Faculty of Materials Science and Chemistry China University of GeosciencesWuhanHubeiChina

The exploration of high-energy-density electrostatic capacitors capable of operating both efficiently and reliably at elevated temperatures is of great significance in order to meet advanced power electronic *** energy density of a capacitor is strongly dependent on dielectric constant and breakdown strength of a dielectric ***,we demonstrate a class of solution-processable polymer nanocomposites exhibiting a concurrent improvement in dielectric constant and breakdown strength,which typically show a negative correlation in conventional dielectric materials,along with a reduction in dielectric *** excellent performance is enabled by the elegant combination of nanostructured barium titanate and boron nitride fillers with complementary *** ternary polymer nanocomposite with the optimized filler compositions delivers a discharged energy density of 2.92 J cm^−3 and a Weibull breakdown strength of 547 MV m^−1 at 150℃,which are 83%and 25%,respectively,greater than those of the pristine *** conduction behaviors including interfacial barrier and carrier transport process have been investigated to rationalize the energy storage performance of ternary polymer *** contribution provides a new design paradigm for scalable high-temperature polymer film capacitors.

关键词： breakdown strength capacitors dielectric constant high temperature polymer nanocomposites

Prediction of breakdown strength of cellulosic insulating materials using artificial neural networks

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Journal of Advanced Dielectrics 2018年第1期8卷 25-28页

作者： Sakshi Singh M.M.Mohsin Aejaz Masood Department of Electrical Engineering Z.H.College of Engineering&Technology Aligarh Muslim University AligarhUP 202002India

In this research work,a few sets of experiments have been performed in high voltage laboratory on various cellulosic insulating materials like diamond-dotted paper,paper phenolic sheets,cotton phenolic sheets,leatheroid,and presspaper,to measure different electrical parameters like breakdown strength,relative permittivity,loss tangent,*** the dependency of breakdown strength on other physical parameters,different Artificial Neural Network(ANN)models are proposed for the prediction of breakdown *** ANN model results are compared with those obtained experimentally and also with the values already predicted from an empirical relation suggested by Swanson and *** reported results indicated that the breakdown strength predicted from the ANN model is in good agreement with the experimental values.

关键词： Cellulosic materials relative permittivity loss tangent breakdown strength ANN

Superior energy storage performance of BNT-based ferroelectric ceramics based on maintaining high polarization and breakdown strength

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Journal of Advanced Dielectrics 2024年第4期14卷 20-29页

作者： Mingjia Jiang Zhanhui Peng Qiyuan Zhou Di Wu Lingling Wei Pengfei Liang Xiaolian Chao Zupei Yang Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Laboratory for Advanced Energy Technology School of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiP.R.China School of Chemistry and Chemical Engineering Shaanxi Normal University Xi’an 710062 ShaanxiP.R.China School of Physics and Information Technology Shaanxi Normal University Xi’an 710062 ShaanxiP.R.China

Bi_(0.5)Na_(0.5)TiO_(3)(BNT)-based lead-free ceramics with superior ferroelectric properties are considered to be extremely advantageous in energy storage capacitors for future green ***,we demonstrate an approach to achieve both ultrahigh energy density W_(rec)and efficiencyηby regulating the multiscale electropolar structures and microstructure.A satisfactory energy storage performance of a high W_(rec)of 4.02 J·cm^(-3),and a decentηof 80%under 415 kV·cm^(-1)are attained in the 0.5(BNT-CS)-0.5SB_(0.2)T ceramic(abbreviated as BNT-0.2SBT).Moreover,BNT-0.2SBT exhibits superior power density(P_(D)=107MW·cm^(-3)),ultrafast discharge time(t_(0.9)=116 ns)at 150 kV·cm^(-1),and good temperature *** findings in this work not only demonstrate that a valid candidate,but also provide a new idea of how to achieve both high-energy storage density and efficiency in lead-free ferroelectric materials.

关键词： Energy storage Bi_(0.5)Na_(0.5)TiO_(3) ceramics relaxor characteristics breakdown strength

Gradient-structure-enhanced dielectric energy storage performance of flexible nanocomposites containing controlled preparation of defective TiO_(2) and ferroelectric KNbO_(3) nanosheets

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Nano Research 2024年第5期17卷 4079-4088页

作者： Yan Wang Lili Zhao Ruicong Chen Wenhui Zhao Dengwei Hu Haoran Wang Bin Cui Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Shaanxi Key Laboratory of Physico–Inorganic Chemistry Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China School of Information Science and Technology Northwest UniversityXi’an 710127China Engineering Research Center for Titanium Based Functional Materials and Devices in Universities of Shaanxi Province Faculty of Chemistry and Chemical EngineeringBaoji University of Arts and SciencesBaoji 721013China

Next generation power system needs dielectrics with increased dielectric energy ***,the low energy density of dielectrics limits their ***,an asymmetric trilayered nanocomposite,with a transition layer(TL),an insulation layer(IL),and a polarization layer(PL),is designed based on poly(vinylidene fluoride)-polymethyl methacrylate(PVDF-PMMA)matrix using KNbO_(3)(KN)and TiO_(2)(TO)as the *** morphology and defect control of the two-dimensional nano KN and nano TO fillers are realized via a hydrothermal method to increase the composite breakdown strength(E_(b))and the composite energy density(U_(e)).The asymmetric trilayered structure leads to a gradient electric field distribution,and the KN and TO nanosheets block charges transfer along z *** a result,the development path of the electrical trees is greatly curved,and E_(b) is effectively *** the Ue value of the nanocomposites reaches 17.79 J·cm^(-3) at 523 MV·m^(-1).On the basis,the composite Ue is further improved by defect control in TO *** nanocomposite KN/TO/PVDF-PMMA containing TO with less oxygen vacancy concentration(calcined at oxygen atmosphere)acquires a high Ue of 21.61 J·cm^(-3) at 548 MV·m^(-1).This study provides an idea for improving the energy storage performance by combining the design of the composite dielectric structure and the control of nanofillers’defect and morphology.

关键词： asymmetric trilayered structure two-dimensional energy density oxygen vacancies breakdown strength dielectric

Enhancing energy storage density of poly(arylene ether nitrile)via incorporating modified barium titanate nanorods and hotstretching

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Nano Research 2024年第8期17卷 7574-7584页

作者： Zhengjiao Zhang Lingyun Zhou Lingling Wang Qingqing Hao Xiufu Hua Renbo Wei School of Chemical Engineering Northwest UniversityXi’an 710069China Yangtze Delta Region Institute Tsinghua UniversityJiaxing 314006China

Dielectric energy storage materials that are extensively employed in capacitors and other electronic devices have attracted increasing attentions amid the rapid progress of electronic ***,the commercialized polymeric and ceramic dielectric materials characterized by low energy storage density face numerous limitations in practical *** this study,we report the simultaneous enhancement of dielectric properties of poly(arylene ether nitrile)(PEN)through the incorporating of sulfonated PEN(SPEN)modified barium titanate nanorods(BTNR)(SPEN@BTNR)and *** is synthesized using a two-step hydrothermal method,aminated with KH550,and then reacted with SPEN to form the cladding-modified SPEN@*** to the intrinsic high permittivity of barium titanate(BT)and enhanced compatibility between SPEN@BTNR and PEN stemming from the cladding of SPEN,the dielectric constant and breakdown strength of SPEN@BTNR/PEN composite are as high as 14.0 at 103 Hz and 198.1 kV/mm at the doping amount of 15 wt.%,*** a result,the energy storage density of SPEN@BTNR/PEN is increased to 2.43 J/cm^(3),compared with that of 0.82 J/cm^(3)for *** addition,derived from the rearrangement of SPEN@BTNR and orientation of PEN after hot-stretching,the dielectric constant and breakdown strength of SPEN@BTNR/PEN with 15 wt.%fillers are further enhanced to 17.1 and 204.8 kV/mm,respectively,resulting in an energy storage density of 3.36 J/cm^(3).The boosting of energy storage density up to 310%provides a new idea for improving the performances of dielectric energy storage materials.

关键词： barium titanate nanorods poly(arylene ether nitrile) dielectric constant breakdown strength energy density

Leakage current characteristics of SrTiO_(3)/LaNiO_(3)/Ba_(0.67)Sr_(0.33)TiO_(3)/SrTiO_(3 )heterostructure thin films

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Rare Metals 2021年第4期40卷 961-967页

作者： Yi Zhang Xiao-Yang Chen Bin Xie Zhi Wang Ming-Jian Ding Qiao He Hang Ji Tao-Lan Mo Ping Yu College of Material Science and Engineering Sichuan UniversityChengdu 610064China Aurora Technologies Co. LtdGuangzhou 510288China

There is an urgent demand to explore new approaches of improving the electric breakdown strength of the ferroelectric thin-film capacitor without the degradation of the high dielectric *** this work,LaNiO_(3)/Ba_(0.67)Sr_(0.33)TiO_(3)(LNO/BST) thin film and SrTiO_(3)(STO)/LNO/BST/SrTiO_(3)(STO) were prepared by using radio frequency(RF) magnetron sputtering technique and ultrathin STO insulator layers were inserted between the LNO/BST and metal electrodes(Au or Pt) to improve the electric breakdown strength and the leakage current of the LNO/BST thin film.X-ray diffraction(XRD) and scanning electron microscopy(SEM) investigations revealed that these multilayer thin films show compact,smooth and uniform *** leakage current density of STO/LNO/BST/STO thin film was decreased by one order of magnitude and breakdown strength of STO/LNO/BST/STO thin film was enhanced from 0.72 to 1.26 MV-cm-1compared with that of LNO/BST thin ***,the dielectric constant of the STO/LNO/BST/STO thin film keeps at the same level as that of LNO/BST thin film,and dielectric loss of the STO/LNO/BST/STO thin film was decreased slightly compared with that of LNO/BST thin film.

关键词： LNO/BST Interface engineering breakdown strength Barrier layer SrTiO_(3)