High temperature polyimide nanocomposites containing twodimensional nanofillers for improved thermal stability and capacitive energy storage performance  

作　　者：Ding Ai Yuting Han Zongliang Xie Xi Pang Yuan Chang He Li Chenglong Wu Yonghong Cheng Guanglei Wu 

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8期7746-7755,共10页纳米研究（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.52107232 and 52377026);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：Future electronic devices toward high integration and miniaturization demand reliable operation of dielectric materials at high electric fields and elevated temperatures.However,the electrical deterioration caused by Joule heat generation remains a persistent challenge to overcome.Here,the solution-processed polyimide(PI)nanocomposites with unique two-dimensional(2D)alumina nanoplates are reported.Substantial improvements in the breakdown strength,charge–discharge efficiency and discharged energy density at elevated temperatures have been demonstrated in the composites,owing to simultaneously suppressed conduction loss and increased thermal conductivity upon the incorporation of 2D Al_(2)O_(3) nanofillers possessing excellent dielectric insulation and thermophysical properties.The predominance of Al_(2)O_(3) nanoplates in enhancing thermal stability and high-temperature capacitive performance over nanoparticles and nanowires is validated experimentally and is further rationalized via finite element simulations.Notably,the Al_(2)O_(3) nanoplates filled PI nanocomposite exhibits a hightemperature capability up to 200℃ and remarkable efficiency(e.g.≥95% at 200 MV/m)over a wide temperature range,which outperforms commercial dielectric polymers and rivals the state-of-the-art polyimide nanocomposites.

关 键 词：capacitors polymer nanocomposites high temperature energy storage thermal stability 

分 类 号：TB383[一般工业技术—材料科学与工程]