Al_(2)O_(3)/PEI复合介质的高温储能特性研究  

Research on High Temperature Energy Storage Characteristics of Al_(2)O_(3)/PEI Dielectric Composites

作　　者：孟令欣 邓伟[1,2] 胡思远 冯嘉唯 王照盼 MENG Lingxin;DENG Wei;HU Siyuan;FENG Jiawei;WANG Zhaopan(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150040 [2]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080

出　　处：《材料导报》2024年第22期250-257,共8页Materials Reports

基　　金：黑龙江省自然科学基金(LH2019E059);国家自然科学基金(U20A20307)。

摘　　要：高温储能的电介质材料对电子电力设备容量和可靠性的提升、体积的减小具有重要意义。以耐高温的聚醚酰亚胺(PEI)为基体,宽带隙的氧化铝(Al_(2)O_(3))为填料,通过溶液共混再流延制备Al_(2)O_(3)/PEI复合薄膜,对比研究了Al_(2)O_(3)纳米粒子(AO NPs)和静电纺Al_(2)O_(3)纤维(AO NFs)对复合薄膜介电储能特性的影响。结果表明,Al_(2)O_(3)能够兼顾提升PEI复合薄膜的极化强度和击穿场强,降低电导率。相较于AO NPs,AO NFs在PEI基体中的分散更为均匀,可在极低填料含量下获得具有优异储能特性的Al_(2)O_(3)/PEI复合薄膜。当填料含量为0.5%(如无特别说明,均为体积分数)时,AO NFs/PEI在25℃的储能密度达5.80 J/cm^(3),分别是0.50AO NPs/PEI和纯PEI薄膜的1.2倍和2.5倍。150℃下0.50AO NFs/PEI仍表现出优异的储能特性,储能密度和充放电效率分别为4.36 J/cm^(3)和75%。High temperature energy storage dielectric materials are of great significance for improving the capacity and reliability of electronic and power equipment,as well as reducing their volume.In this work,aluminum oxide/polyether imide(Al_(2)O_(3)/PEI)composite films were obtained via solution blending and casting method using high-temperature resistant PEI as the matrix and Al_(2)O_(3)with wide bandgap as the fillers.The effects of alumina nanoparticles(AO NPs)and electrospun alumina nanofibers(AO NFs)on the dielectric energy storage characteristics of the composite films were studied comparatively.The results show that Al_(2)O_(3)can improve polarization and breakdown strength simultaneously,as well as decrease conductivity.Compared with AO NPs,AO NFs are more evenly dispersed in the PEI matrix,thus obtaining high energy storage Al_(2)O_(3)/PEI composite films at extremely low filler content.When the filler content is 0.50%,the energy storage density of AO NFs/PEI at 25℃reaches 5.80 J/cm^(3),which is 1.2 and 2.5 times higher than that of 0.50AO NPs/PEI and pure PEI films,respectively.Furthermore,0.50AO NFs/PEI composite films still exhibit excellent energy storage characteristics at 150℃,with energy storage density and charge discharge efficiency of 4.36 J/cm^(3)and 75%,respectively.

关 键 词：聚醚酰亚胺 氧化铝纤维 高温 介电性能 储能密度 

分 类 号：TB332[一般工业技术—材料科学与工程]