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Significantly Improved High-Temperature Energy Storage Performance of BOPP Films by Coating Nanoscale Inorganic Layer 被引量:2
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作者 Tiandong Zhang Hainan Yu +5 位作者 Young Hoon Jung Changhai Zhang Yu Feng qingguo Chen Keon Jae Lee qingguo chi 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第2期30-38,共9页
Biaxially oriented polypropylene(BOPP)is one of the most commonly used commercial capacitor films,but its upper operating temperature is below 105℃due to the sharply increased electrical conduction loss at high tempe... Biaxially oriented polypropylene(BOPP)is one of the most commonly used commercial capacitor films,but its upper operating temperature is below 105℃due to the sharply increased electrical conduction loss at high temperature.In this study,growing an inorganic nanoscale coating layer onto the BOPP film's surface is proposed to suppress electrical conduction loss at high temperature,as well as increase its upper operating temperature.Four kinds of inorganic coating layers that have different energy band structure and dielectric property are grown onto the both surface of BOPP films,respectively.The effect of inorganic coating layer on the high-temperature energy storage performance has been systematically investigated.The favorable coating layer materials and appropriate thickness enable the BOPP films to have a significant improvement in high-temperature energy storage performance.Specifically,when the aluminum nitride(AIN)acts as a coating layer,the AIN-BOPP-AIN sandwich-structured films possess a discharged energy density of 1.5 J cm^(-3)with an efficiency of 90%at 125℃,accompanying an outstandingly cyclic property.Both the discharged energy density and operation temperature are significantly enhanced,indicating that this efficient and facile method provides an important reference to improve the high-temperature energy storage performance of polymer-based dielectric films. 展开更多
关键词 coating layer energy storage interfacial barrier polymer films
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Enhanced High-Temperature Energy Storage Performance of All-Organic Composite Dielectric via Constructing Fiber-Re in forced Structure 被引量:1
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作者 Mengjia Feng Yu Feng +5 位作者 Changhai Zhang Tiandong Zhang Xu Tong Qiang Gao qingguo Chen qingguo chi 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第2期299-307,共9页
Optimizing the high-temperature energy storage characteristics of energy storage dielectrics is of great significance for the development of pulsed power devices and power control systems.Selecting a polymer with a hi... Optimizing the high-temperature energy storage characteristics of energy storage dielectrics is of great significance for the development of pulsed power devices and power control systems.Selecting a polymer with a higher glass transition temperature(T_(g))as the matrix is one of the effective ways to increase the upper limit of the polymer operating temperature.However,current high-T_(g)polymers have limitations,and it is difficult to meet the demand for high-temperature energy storage dielectrics with only one polymer.For example,polyetherimide has high-energy storage efficiency,but low breakdown strength at high temperatures.Polyimide has high corona resistance,but low high-temperature energy storage efficiency.In this work,combining the advantages of two polymer,a novel high-T_(g)polymer fiber-reinforced microstructure is designed.Polyimide is designed as extremely fine fibers distributed in the composite dielectric,which will facilitate the reduction of high-temperature conductivity loss for polyimide.At the same time,due to the high-temperature resistance and corona resistance of polyimide,the high-temperature breakdown strength of the composite dielectric is enhanced.After the polyimide content with the best high-temperature energy storage characteristics is determined,molecular semiconductors(ITIC)are blended into the polyimide fibers to further improve the high-temperature efficiency.Ultimately,excellent high-temperature energy storage properties are obtained.The 0.25 vol%ITIC-polyimide/polyetherimide composite exhibits high-energy density and high discharge efficiency at 150℃(2.9 J cm^(-3),90%)and 180℃(2.16 J cm^(-3),90%).This work provides a scalable design idea for high-performance all-organic high-temperature energy storage dielectrics. 展开更多
关键词 all-organic energy storage density high-temperature high-temperature breakdown strength
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Tunable antiferroelectric-like polarization behavior and enhanced energy storage characteristics in symmetric BaTiO_(3)/BiFeO_(3)/BaTiO_(3) heterostructure
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作者 Ying Wang Hanfei Zhu +8 位作者 Hongyu Luo Jianting Li Yu Huan Yuyao Zhao Li Li Hongbo Cheng Chao Liu qingguo chi Jun Ouyang 《Journal of Materiomics》 SCIE CSCD 2024年第6期1290-1298,共9页
The excellent energy storage performances of dielectric materials,a high energy density and efficiency,the stability in a wide range of temperature,frequency and cycling time,are surely desirable for the energy storag... The excellent energy storage performances of dielectric materials,a high energy density and efficiency,the stability in a wide range of temperature,frequency and cycling time,are surely desirable for the energy storage devices.A trade-off relationship between polarization and breakdown strength,however,limits the enhancement of energy storage properties of dielectric materials.To effectively boost the energy density and efficiency of dielectric capacitors,by inserting a BiFeO_(3) layer into the BaTiO_(3) film in present case,the symmetric BaTiO_(3)/BiFeO_(3)/BaTiO_(3) tri-layer film heterostructure with antiferroelectric-like characteristics was constructed based on the dual-interlayer coupling effect,what's more,its antiferroelectric-like characteristics will evolve with electric field.Such the tunable polarization behavior endows it with an enhanced maximum polarization but a reduced remnant one,a delayed saturation of polarization and a high breakdown strength,which are synergistically accountable for a large energy density(Wrec∼109 J/cm^(3))and a high efficiency(η∼82.6%),together with the good thermal(TR∼200℃,ΔWrec<3%&Δη<10%)and frequency(50 Hz–10 kHz,ΔWrec<7%&Δη<13%)stabilities,particularly an outstanding cycling reliability(10^(9) cycles,both ΔWrec and Δη<1%).Hence these findings can provide some innovative ideas for enriching the performance tuning of ferroelectrics,especially in enhancing their energy storage characteristics. 展开更多
关键词 Antiferroelectric-like Tri-layer film heterostructure Tunable polarization behavior Interlayer coupling Energy storage
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Carbon nanotubes and hexagonal boron nitride nanosheets co-filled ethylene propylene diene monomer composites:Improved electrical property for cable accessory applications
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作者 Tiandong Zhang Huiduo Xu +3 位作者 Chuanxian Dai Changhai Zhang Yongquan Zhang qingguo chi 《High Voltage》 SCIE EI CSCD 2024年第3期546-555,共10页
Rubber-based composites based on ethylene propylene diene monomer(EPDM)with excellent non-linear electrical conductivity are preferred to serve as reinforced insu-lation in cable accessories,which can self-adaptively ... Rubber-based composites based on ethylene propylene diene monomer(EPDM)with excellent non-linear electrical conductivity are preferred to serve as reinforced insu-lation in cable accessories,which can self-adaptively regulate electric field distribution and avoid electric field concentration due to the non-linear conductivity.The conductive carbon nanotubes(CNT)are filled into EPDM to improve the non-linear conductivity,while the insulating hexagonal boron nitride nanosheets(h-BN)are used to reconcile the electric breakdown strength.The results show that with the increase of CNT loading content,the non-linear conductivity of CNT/h-BN/EPDM com-posites becomes more prominent,accompanying the decrease of threshold field strength and increase of non-linear coefficient.However,the electric breakdown strength of CNT/h-BN/EPDM composites seriously deteriorates due to the increase of CNT content and temperature.By incorporating 10 wt.%h-BN into the com-posites,the reduction percentage of breakdown strength can be significantly lowered,which is 19.95%of neat EPDM and 13.74%of CNT/h-BN/EPDM composites at 70℃,respectively.The COMSOL Multiphysics simulation results demonstrate that using the CNT/h-BN/EPDM composite as the reinforced insulation can eliminate the electric field concentration of the cable accessory as well as enable the cable accessory with good lightning shock resistance. 展开更多
关键词 COMPOSITES hexagonal boron
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Machine learning and microstructure design of polymer nanocomposites for energy storage application 被引量:2
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作者 Yu Feng Wenxin Tang +5 位作者 Yue Zhang Tiandong Zhang Yanan Shang qingguo chi qingguo Chen Qingquan Lei 《High Voltage》 SCIE EI 2022年第2期242-250,共9页
Film dielectric capacitors have been widely used in high‐power electronic equipment.The design of microstructure and the choice of fillers play an important role in nano-composites'energy storage density.Machine ... Film dielectric capacitors have been widely used in high‐power electronic equipment.The design of microstructure and the choice of fillers play an important role in nano-composites'energy storage density.Machine learning methods can classify and summarise the limited data and then explore the promising composite structure.In this work,a dataset has been established,which contained a large amount of data on the maximum energy storage density of nanocomposites.Though using processed visual image infor-mation to express the internal information of composite,the prediction accuracy of the prediction models built by three machine learning algorithms increase from 84.1%to 91.9%,80.9%to 68.9%,70.6%to 81.6%,respectively.By calculating the branch weight in the random forest prediction model,the influence degree of different descriptors on the energy storage performance of nanocomposites is analysed.A total of 10 groups of composites with different structure and filler amount were prepared in the laboratory,which were used to verify the reliability of prediction models.Finally,the effective filler's structure is explored by three prediction models and some suggestions for the interface design of filler are given. 展开更多
关键词 COMPOSITES COMPOSITE PREDICTION
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High-temperature energy storage dielectric with inhibition of carrier injection/migration based on band structure regulation 被引量:3
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作者 Guang Liu Qingquan Lei +4 位作者 Yu Feng Changhai Zhang Tiandong Zhang qingguo Chen qingguo chi 《InfoMat》 SCIE CSCD 2023年第2期22-33,共12页
Dielectric capacitors have a high power density,and are widely used in military and civilian life.The main problem lies in the serious deterioration of dielectric insulation performance at high temperatures.In this st... Dielectric capacitors have a high power density,and are widely used in military and civilian life.The main problem lies in the serious deterioration of dielectric insulation performance at high temperatures.In this study,a polycarbonate(PC)-based energy storage dielectric was designed with BN/SiO_(2)heterojunctions on its surface.Based on this structural design,a synergistic suppression of the carrier injection and transport was achieved,significantly improving the insulating properties of the polymer film.In particular,the composite film achieves optimal high-temperature energy-storage properties.The composite film can withstand an electric field intensity of 760 MV m^(-1)at 100℃and obtain an energy storage density of 8.32 J cm^(-3),while achieving a breakthrough energy storage performance even at 150℃(610 MV m^(-1),5.22 J cm^(-3)).Through adjustment of the heterojunction structure,free adjustment of the insulation performance of the material can be realized;this is of great significance for the optimization of the material properties. 展开更多
关键词 electron injection and transport HETEROJUNCTION high temperature energy storage characteristics INSULATION POLYCARBONATE
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Tunable polarization-drived superior energy storage performance in PbZrO_(3) thin films 被引量:2
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作者 Tiandong Zhang Zhuangzhuang Shi +5 位作者 Chao Yin Changhai Zhang Yue Zhang Yongquan Zhang qingguo Chen qingguo chi 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第5期930-942,共13页
Antiferroelectric PbZrO_(3)(AFE PZO)films have great potential to be used as the energy storage dielectrics due to the unique electric field(E)-induced phase transition character.However,the phase transition process a... Antiferroelectric PbZrO_(3)(AFE PZO)films have great potential to be used as the energy storage dielectrics due to the unique electric field(E)-induced phase transition character.However,the phase transition process always accompanies a polarization(P)hysteresis effect that induces the large energy loss(Wloss)and lowers the breakdown strength(EBDS),leading to the inferior energy storage density(Wrec)as well as low efficiency.In this work,the synergistic strategies by doping smaller ions of Li^(+)–Al^(3+)to substitute Pb2+and lowering the annealing temperature(T)from 700 to 550℃are proposed to change the microstructures and tune the polarization characters of PZO films,except to dramatically improve the energy storage performances.The prepared Pb_((1−x))(Li_(0.5)Al_(0.5))_(x)ZrO_(3)(P_((1−x))(L_(0.5)A_(0.5))_(x)ZO)films exhibit ferroelectric(FE)-like rather than AFE character once the doping content of Li^(+)–Al^(3+)ions reaches 6 mol%,accompanying a significant improvement of W_(rec) of 49.09 J/cm^(3),but the energy storage efficiency(η)is only 47.94%due to the long-correlation of FE domains.Accordingly,the low-temperature annealing is carried out to reduce the crystalline degree and the P loss.P_(0.94)(L_(0.5)A_(0.5))_(0.06)ZO films annealed at 550℃deliver a linear-like polarization behavior rather than FE-like behavior annealed at 700℃,and the lowered remanent polarization(P_(r))as well as improved E_(BDS)(4814 kV/cm)results in the superior Wrec of 58.7 J/cm^(3) and efficiency of 79.16%,simultaneously possessing excellent frequency and temperature stability and good electric fatigue tolerance. 展开更多
关键词 lead zirconate ionic pair POLARIZATION breakdown strength energy storage
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Tunable polarization-drived high energy storage performances in flexible PbZrO_(3)films by growing Al_(2)O_(3)nanolayers 被引量:2
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作者 Chao Yin Tiandong Zhang +3 位作者 Zhuangzhuang Shi Bowen Zhang Changhai Zhang qingguo chi 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第11期2123-2133,共11页
In recent years,PbZrO_(3)(PZO)films have become favorable electric storage materials due to the unique electric field-induced phase transition behavior,but the severe hysteresis effect leads to low energy storage dens... In recent years,PbZrO_(3)(PZO)films have become favorable electric storage materials due to the unique electric field-induced phase transition behavior,but the severe hysteresis effect leads to low energy storage density and efficiency.In this work,inserting Al_(2)O_(3)(AO)insulation nanolayers is proposed to tune the polarization behavior of flexible PZO films,anticipating optimization of energy storage performance.The results show that the thickness of the AO nanolayers has a deep influence on the polarization behavior of the PZO films,and PZO/AO/PZO(PAP)sandwiched films with 8 nm AO interlayer deliver relaxor ferroelectric-like polarization instead of antiferroelectric counterpart.To further utilize the AO nanolayers as top/bottom layers,the linear-like polarization and the highest breakdown strength are achieved in the AO/PZO/AO/PZO/AO(APAPA8)multilayer films,leading to both high discharged energy storage density of 35.2 J/cm^(3) and efficiency of 92.9%,as well as excellent fatigue and bending endurance,good temperatures,and frequency stability.The tunable polarization induced by growing the AO nanolayers makes antiferroelectric PZO films have great potential to be used as energy storage dielectrics. 展开更多
关键词 SOL-GEL FLEXIBLE ANTIFERROELECTRIC polarization energy storage
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Non-linear electrical conductivity of ethylene-propylene-diene monomer-based composite dielectrics by tuning inorganic fillers 被引量:1
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作者 Tiandong Zhang Hao Li +3 位作者 Changhai Zhang Chao Tang Zhonghua Li qingguo chi 《High Voltage》 SCIE EI CSCD 2023年第4期781-790,共10页
In this study,three kinds of inorganic fillers are chosen and filled into ethylene-propylenediene monomer(EPDM)matrix,including silicon carbide,copper calcium titanate(CCTO),and vanadium dioxide(VO2).The electrical pr... In this study,three kinds of inorganic fillers are chosen and filled into ethylene-propylenediene monomer(EPDM)matrix,including silicon carbide,copper calcium titanate(CCTO),and vanadium dioxide(VO2).The electrical properties of the three modified composites at different temperatures have been systematically studied.The intrinsic conductance behaviours of different inorganic fillers on the direct current conductance and electric breakdown strength of the composite dielectrics are also analysed,and the possible mechanism for non-linear conductivity is revealed.The electrical conductivity increases with the increase of fillers content,where 30 wt.%CCTO/EPDM composite dielectric has a high non-linear coefficient of 5.71.The increase in temperature can further increase the conductivity of the composites,accompanying a lower breakdown strength.When the temperature rises to 70℃,the VO2/EPDM composite has a higher conductivity,but the electric breakdown strength degrades seriously.The simulation results show that the composites with non-linear electrical conductivity characteristics can effectively uniform the electric field and solve the problem of electric field concentration at the root of the stress cone,which is beneficial to improving the safe operation of the cable accessories. 展开更多
关键词 COMPOSITE composites CONDUCTIVITY
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Flash sintering of high-purity alumina at room temperature
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作者 Yueji Li qingguo chi +4 位作者 Ziyang Yan Nianping Yan Jinling Liu Rongxia Huang Xilin Wang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第12期2382-2388,共7页
For the first time,the flash sintering(FS)of high-purity alumina at room temperature,which was previously considered unachievable due to its low electrical conductivity,was conducted herein.The electrical arc originat... For the first time,the flash sintering(FS)of high-purity alumina at room temperature,which was previously considered unachievable due to its low electrical conductivity,was conducted herein.The electrical arc originating from surface flashover was harnessed to induce FS at room temperature and low air pressure.The successful FS of high-purity alumina was realized at 60 kPa under the arc constraint,resulting in a notable relative density of the alumina sample of 98.7%.The electric–thermal coupling between the arc and high-purity alumina sample during the arc-induced FS process was analyzed via the finite element simulation method.The results revealed the thermal and electrical effects of the arc on the sample,which ultimately enhance the electrical conductivity of the alumina sample.The formation of a conductive channel on the sample surface,a result of increased electrical conductivity,was the pivotal factor in achieving FS in high-purity alumina at room temperature.The arc constraint technique can be applied to numerous materials,such as ionic conductors,semiconductors,and even insulators,under room-temperature and low-air-pressure conditions. 展开更多
关键词 flash sintering(FS) high-purity alumina arc constraint electric-thermal coupling simulation
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Synthesis of MnxOy@C hybrid composites for optimal electromagnetic wave absorption capacity and wideband absorption 被引量:8
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作者 Yue Liu Xuehua Liu +4 位作者 Xinyu E Bingbing Wang Zirui Jia qingguo chi Guanglei Wu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第8期157-164,共8页
The fabrication of high-performance electromagnetic(EM)wave absorption(EMA)materials is an effective strategy to deal with ever-increasing EM pollution.In this work,a series of manganese oxides/porous carbon(Mn_(x)O_(... The fabrication of high-performance electromagnetic(EM)wave absorption(EMA)materials is an effective strategy to deal with ever-increasing EM pollution.In this work,a series of manganese oxides/porous carbon(Mn_(x)O_(y)@C)hybrid composites are obtained by a two-step process.It is revealed that different manganese oxides play various influence on the dielectric properties of absorbers.Owing to the moderate complex permittivity of MnO@C hybrid composites,the optimal reflection loss could reach as high as-76.0 dB at the matching thickness of 2.0 mm with 5.2 GHz of effective absorption bandwidth at thickness of 2.1 mm.We demonstrated that the addition of porous carbon is vital for enhancing EMA performance of composites,which not only coordinates impedance matching allowing more EM waves enter the absorber,but also provides the path for electron movement,thus profiting conductive loss.Besides,different heterogeneous interfaces including porous carbon,manganese oxide and so on,are conducive to contribution of interface polarization.The most noteworthy is ingenious design of composite materials and systematic research of EM energy attenuation mechanism in this work will provide the possibility to realize high-performance EMA. 展开更多
关键词 Manganese oxide/carbon composites Dielectric loss Relaxation time Electromagnetic wave absorption
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Flexible mica films coated by magnetron sputtered insulating layers for high-temperature capacitive energy storage
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作者 Chao Yin Tiandong Zhang +4 位作者 Changhai Zhang Yue Zhang Chang Kyu Jeong Geon-Tae Hwang qingguo chi 《SusMat》 SCIE EI 2024年第5期154-162,共9页
High-temperature energy storage performance of dielectric capacitors is cru-cial for the next generation of power electronic devices.However,conduction losses rise sharply at elevated temperature,limiting the applicat... High-temperature energy storage performance of dielectric capacitors is cru-cial for the next generation of power electronic devices.However,conduction losses rise sharply at elevated temperature,limiting the application of energy storage capacitors.Here,the mica films magnetron sputtered by different insulating layers are specifically investigated,which exhibit the excellent high-temperature energy storage performance.The experimental results revealed that the PbZrO3/Al2O3/PbZrO3(PZO/AO/PZO)interface insulating layers can effec-tively reduce the high-temperature leakage current and conduction loss of the composite films.Consequently,the ultrahigh energy storage density(Wrec)and charge‒discharge efficiency(η)can be achieved simultaneously in the flexi-ble mica-based composite films.Especially,PZO/AO/PZO/mica/PZO/AO/PZO(PAPMPAP)films possess excellent Wrec of 27.5 J/cm3 andηof 87.8%at 200◦C,which are significantly better than currently reported high-temperature capaci-tive energy storage dielectric materials.Together with outstanding power density and electrical cycling stability,the flexible films in this work have great appli-cation potential in high-temperature energy storage capacitors.Moreover,the magnetron sputtering technology can deposit large-area nanoscale insulating layers on the surface of capacitor films,which can provide technical support for the industrial production of capacitors. 展开更多
关键词 energy storage high temperature insulating layer magnetron sputtering mica
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