Enhanced energy density in polyetherimide nanocomposite film at high temperature induced by electrospun BaZrTiO_(3) nanofibers  

作　　者：Ming-Zhi Fan Bin-Zhou Sun Jian-Yong Jiang Jia-Yu Pan Peng-Hao Hu 

机构地区：[1]Research Center for New Energy Composite Materials,Foshan(Southern China)Institute for New Materials,Foshan,528200,China [2]Research Center for New Functional Composites,Wuzhen Laboratory,Tongxiang,314500,China

出　　处：《Rare Metals》2023年第6期1912-1922,共11页稀有金属（英文版）

基　　金：financially supported by Guangdong Basic and Applied Basic Research Foundation (No. 2020B1515120074)。

摘　　要：Polymer dielectrics which possess excellent dielectric properties such as high breakdown strength,flexibility,and facile processability are considered as promising materials for advanced electrostatic capacitors.However,most dielectric polymers have unsatisfactory energy storage performances at high-temperature environments.Here,polyetherimide(PEI) nanocomposite films contained with electrospun Ba(Zr_(0.79)Ti_(0.21))O_(3) nanofibers(BZTNFs) are fabricated by common solution casting method.The dielectric properties,especially the breakdown strength of the BZTNFs/PEI nanocomposites,are characterized,yet improvement is only in the small loading ones.The energy storage performance of the 0.5 vol% and1.0 vol% BZTNFs content nanocomposite is further investigated from 25 to 150℃.With the introduction of small loading BZTNFs,the dielectric permittivity and electric displacement of the nanocomposite are improved at all evaluated temperatures.The 1.0 vol% BZTNFs/PEI possesses a maximal discharged energy density of6.05 J·cm^(-3) with high efficiency of 94.9% at 25℃,then falls to 3.34 J·cm^(-3) with efficiency of 54.6% at 150℃ for the larger remnant displacement.Apparently,the relaxation ferroelectric nanofller of BZTNFs is much effective in increasing the dielectric permittivity of nanocomposite,but its capacity to restrict the migration of the charge carriers at high temperatures is weaker than that of the nanofillers with wider bandgap.The complementation of both kinds of the nanofillers probably provides an approach to available high-temperature dielectric films.

关 键 词：Energy density Polyetherimide(PEI) Nanocomposite film High temperature Electrospun nanofibers 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM53[电气工程—电器]