Abstract
Polymer dielectrics with a high energy density and an available energy storage capacity have been playing an important role in ad-vanced electronics and power systems.Nevertheless,the use of polymer dielectrics in harsh environments is limited by their low energy density at high temperatures.Herein,zirconium dioxide(ZrO2)nanoparticles were decorated with amino group utilizing 4,4-methylenebis(phenyl isocyanate)(AMEO)and successfully incorporated into polyetherimide(PEI)matrix.The dielectric properties,breakdown strength,and energy storage performances of PEI/ZrO2-AMEO nanocomposites were investigated from 25 ℃ to 150 ℃.It is found that the combination of moderate bandgap ZrO2 with modest dielectric constant and polar groups at interface with deep trap can offer an available strategy to simultaneously in-crease the dielectric constant and breakdown strength of polymer dielectrics.As a result,the composites containing ZrO2-AMEO exhibit excel-lent energy storage performance at elevated temperatures.Specially,the PEI-based composites with 3 vol％ZrO2-AMEO display a maximum dis-charged energy density(Ud)of 3.1 J/cm3 at 150 ℃,presenting 90％higher than that of neat PEI.This study may help to better develop the poly-mer-based dielectric composite applied at elevated temperatures.
基金项目
Sichuan Science and Technology Program(2022ZHCG0122)
NSAF project(U2230120)
Youth Science and Technology Innovation Team of Sichuan Province of Functional Polymer Composites(2021JDTD0009)
Key Researched Development Program of Sichuan Province(2022YFG0271)
万方数据