含有z向高k纳米线的表面涂层聚合物纳米复合材料作为高温下的高性能介电材料

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-07-10 DOI:10.1049/nde2.12060
Sang Cheng, Mingcong Yang, Jing Fu, Rui Wang, Jinliang He, Qi Li
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引用次数: 0

摘要

近年来,对高温下高性能聚合物薄膜电容器的需求变得更加迫切。高介电常数是介电材料在较低电场条件下获得较大能量密度的必要条件,对实际应用具有重要意义,而如何在不显著降低其他电学性能的前提下提高高温聚合物介电材料的介电常数仍然是一个挑战。本文基于相场模拟提出的最优结构,开发了一种含有z向高k纳米线夹在电子束蒸发沉积Al2O3薄膜中的聚合物纳米复合材料。结果表明,与随机排列的纳米线相比,z向排列的纳米线对介电常数的提高更有效,并且在纳米填料含量较低时,介电常数有较大的提高。外绝缘层有效抑制导电,提高击穿强度。因此,只有1体积分数的z向纳米线的纳米复合材料表现出与纯PEI一样高的击穿强度、电阻和充放电效率,但放电能量密度是150°C时的两倍多。本研究在实验中实现了模拟预测的最优结构,在不牺牲其他电性能的情况下获得了高介电常数、高温的纳米复合材料,并使其在相对较低的电场下实现高的放电能量密度成为可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Surface-coated polymer nanocomposites containing z-aligned high-k nanowires as high-performance dielectrics at elevated temperatures

Recently, demands for high-performance polymer film capacitors at elevated temperatures have become more urgent. High dielectric constant is essential for dielectric materials to achieve substantial energy density at relatively low electric fields, which is of great significance to practical applications, while improving the permittivity of high-temperature polymer dielectrics without a remarkable deterioration in other electrical properties still remains a challenge. Here, a polymer nanocomposite containing z-aligned high-k nanowires sandwiched by e-beam evaporation deposited Al2O3 films was developed based on the optimal structure proposed by the phase-field simulation. It is found that z-aligned nanowires are more effective in promoting the dielectric constant than random-aligned ones, and a large increase in dielectric constant is observed at relatively low content of nanofillers. Outer insulating layers effectively suppress the electric conduction and improve the breakdown strength. Consequently, the nanocomposite with only 1 volume fraction of z-aligned nanowires exhibits a breakdown strength, electrical resistance, and charge–discharge efficiency as high as neat PEI, but more than twice the discharged energy density than it at 150 °C. This study realises the optimal structure predicted by simulation in experiment, obtaining high-permittivity, high-temperature nanocomposites at no expense of other electrical properties, and making it possible to achieve high discharged energy density at relatively low electric fields.

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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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