A flexible polymer nanocomposite has been developed via introducing Nd-doped BaTiO_(3)nanoparticles into the poly(vinylidene fluoride).This nanocomposite delivers a discharged energy density up to 12.5 J/cm^(3)under a...A flexible polymer nanocomposite has been developed via introducing Nd-doped BaTiO_(3)nanoparticles into the poly(vinylidene fluoride).This nanocomposite delivers a discharged energy density up to 12.5 J/cm^(3)under an electric field of 420 kV/mmwith only a small loading of 1 vol.%Nd-BaTiO_(3).High discharged energy density,mechanical flexibility,light weight,ease fabrication and low cost makes it attractive for advanced microelectronics and electrical power systems.Our results demonstrate that ceramics with giant dielectric permittivity as viable fillers for polymer nanocomposite dielectrics with higher energy density.展开更多
The development of advanced dielectric film materials with high energy storage performance is of critical significance for pulsed power capacitor applications.Nevertheless,the low discharged energy density(Ue)of curre...The development of advanced dielectric film materials with high energy storage performance is of critical significance for pulsed power capacitor applications.Nevertheless,the low discharged energy density(Ue)of current dielectric film material restricts their further application.In this work,core-shell structured SrTiO_(3)@SiO_(2) nanowires(ST@SiO_(2) NWs)fillers are fabricated based on interface engineering for high Ue.The optimized SiO2 insulating layer could effectively confine the mobility of space charge carriers in the interfacial zone between ST NWs and thick SiO2 insulating layer,thus reducing the interfacial polarization between the interface of nanofillers/polymer,which could be used to optimize the electric field strength and electric displacement of the corresponding nanocomposite.As a result,this nanocomposite film simultaneously exhibits enhanced maximum applied electric field(Emax)and(Dmax-Pr)values,thus releasing an ultrahigh discharged energy density of 14.7 J/cm^(3) at 390 MV/m,which is 99%higher than that of the conventional ST/P(VDF-CTFE)(without SiO2 coating)nanocomposite,and it is almost 2.5 times that of pure P(VDF-CTFE).This work demonstrates the superiority of the core-shell structured paraelectric nanowire in enhancing the energy storage performance of dielectric film capacitors,which is expected to guide the design of advanced energy-storage nanocomposites.展开更多
基金This work was supported by the National Natural Science Foundation of China(51572123,51202118,51372114)the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures(Nanjing University of Aeronautics and Astronautics)(0514Y01)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).We gratefully acknowledge the Arkema company for providing the PVDF powder.
文摘A flexible polymer nanocomposite has been developed via introducing Nd-doped BaTiO_(3)nanoparticles into the poly(vinylidene fluoride).This nanocomposite delivers a discharged energy density up to 12.5 J/cm^(3)under an electric field of 420 kV/mmwith only a small loading of 1 vol.%Nd-BaTiO_(3).High discharged energy density,mechanical flexibility,light weight,ease fabrication and low cost makes it attractive for advanced microelectronics and electrical power systems.Our results demonstrate that ceramics with giant dielectric permittivity as viable fillers for polymer nanocomposite dielectrics with higher energy density.
基金supported by the National Natural Science Foundation of China(Grant Nos.51672092,11664009 and U1732117)the China Postdoctoral Science Foundation(Grant No.2018M632847)+1 种基金H.Zhang appreciate generous support by the Natural Science Foundation of Hubei Province of China(Grant No.2016CFB370)Wuhan Morning Light Plan of Youth Science and Technology(No.2017050304010299).
文摘The development of advanced dielectric film materials with high energy storage performance is of critical significance for pulsed power capacitor applications.Nevertheless,the low discharged energy density(Ue)of current dielectric film material restricts their further application.In this work,core-shell structured SrTiO_(3)@SiO_(2) nanowires(ST@SiO_(2) NWs)fillers are fabricated based on interface engineering for high Ue.The optimized SiO2 insulating layer could effectively confine the mobility of space charge carriers in the interfacial zone between ST NWs and thick SiO2 insulating layer,thus reducing the interfacial polarization between the interface of nanofillers/polymer,which could be used to optimize the electric field strength and electric displacement of the corresponding nanocomposite.As a result,this nanocomposite film simultaneously exhibits enhanced maximum applied electric field(Emax)and(Dmax-Pr)values,thus releasing an ultrahigh discharged energy density of 14.7 J/cm^(3) at 390 MV/m,which is 99%higher than that of the conventional ST/P(VDF-CTFE)(without SiO2 coating)nanocomposite,and it is almost 2.5 times that of pure P(VDF-CTFE).This work demonstrates the superiority of the core-shell structured paraelectric nanowire in enhancing the energy storage performance of dielectric film capacitors,which is expected to guide the design of advanced energy-storage nanocomposites.
