材料科学
纳米复合材料
纳米颗粒
偶极子
电介质
聚合物
储能
化学工程
聚合物纳米复合材料
极化(电化学)
复合材料
纳米技术
光电子学
化学
有机化学
功率(物理)
热力学
物理化学
物理
工程类
作者
Weibin Ren,Jiayu Pan,Zhenkang Dan,Tao Zhang,Jianyong Jiang,Mingzhi Fan,Penghao Hu,Ming Li,Yuanhua Lin,Ce‐Wen Nan,Yang Shen
标识
DOI:10.1016/j.cej.2020.127614
摘要
The urgent demand for high-temperature dielectrics toward capacitive energy storage arises from numerous emerging harsh-environment high-temperature applications such as electric vehicles, aerospace power conditioning, downhole oil explorations. For these applications, it is imperative to enhance the discharge energy density of polymer-based dielectrics at elevated temperature. Herein, a trace composite approach is proposed and demonstrated. Two types of polyetherimides (PEIs)-based dipolar glasses are designed, synthesized and composited with trace amount of ultrafine Al2O3 nanoparticles. PEIs-based dipolar glasses with high Tg (~250 °C) and much enhanced electrical polarization are constructed by introducing dipolar groups (-CF3) and sulfonyl groups (-SO2-) with high dipolar moment (~4.30 D) in the polymer chains. The incorporation of ultrafine Al2O3 nanoparticles increases the electrical polarization and keeps low loss. The remarkable permittivity enhancement via the ultrafine filling could be ascribed to more active mobility of dipolar groups characterized by activation energy of movement and the correlation of arrangement of dipolar groups in the chains with this effect is also revealed. These results will contribute to deeply understanding and rationally designing high-performance polymer-based nanocomposites orienting to high-temperature electrical energy storage.
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