Dielectric nanocomposites with superb high-temperature capacitive performance based on high intrinsic dielectric constant polymer  

作　　者：Ding Ai Yuan Chang Haoliang Liu Chenglong Wu Yao Zhou Yuting Han Hao Yu Bing Xiao Yonghong Cheng Guanglei Wu Zirui Jia 

机构地区：[1]State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]Institute of Materials for Energy and Environment,State Key Laboratory of Bio-Fibers and Eco-Textiles,College of Materials Science and Engineering,Qingdao University,Qingdao 266071,China

出　　处：《Nano Research》2024年第9期8504-8512,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52107232,52377026 and 52301192);China Postdoctoral Science Foundation(No.2021M702563);State Key Laboratory of Electrical Insulation and Power Equipment(No.EIPE22312);Taishan Scholars and Young Experts Program of Shandong Province(No.tsqn202103057);the Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural-Functional Polymer Composites)and Fundamental Research Funds for the Central Universities(No.xzy012024004).

摘　　要：Advancements in power electronics necessitate dielectric polymer films capable of operating at high temperatures and possessing high energy density.Although significant strides have been achieved by integrating inorganic fillers into high-temperature polymer matrices,the inherently low dielectric constants of these matrices have tempered the magnitude of success.In this work,we report an innovative nanocomposite based on sulfonylated polyimide(SPI),distinguished by the incorporation of sulfonyl groups within the SPI backbone and the inclusion of wide bandgap hafnium dioxide(HfO_(2))nanofillers.The nanocomposite has demonstrated notable enhancements in thermal stability,dielectric properties,and capacitive performance at elevated temperatures.Detailed simulations at both molecular and mesoscopic levels have elucidated the mechanisms behind these improvements,which could be attributed to confined segmental motion,an optimized electronic band structure,and a diminished incidence of dielectric breakdown ascribed to the presence of sulfonyl groups.Remarkably,the SPI-HfO_(2)nanocomposite demonstrates a high charge-discharge efficiency of 95.7%at an elevated temperature of 150℃and an applied electric field of 200 MV/m.Furthermore,it achieves a maximum discharged energy density of 2.71 J/cm^(3),signalling its substantial potential for energy storage applications under extreme conditions.

关 键 词：dielectric polymer nanocomposites high-temperature high dielectric constant sulfonyl groups energy storage performance 

分 类 号：O57[理学—粒子物理与原子核物理]