西南交通大学王勇团队报道了利用表面功能化ZrO₂纳米颗粒显著增强PEI基复合材料的高温储能性能。相关研究成果发表在2023年12月7日出版的《中国高分子科学杂志》。

具有高能量密度和可用储能容量的聚合物电介质在先进的电子和电力系统中发挥着重要作用。然而，聚合物电介质在恶劣环境中的使用受到其在高温下的低能量密度的限制。

该文利用4，4-亚甲基双（苯基异氰酸酯）（AMEO）对二氧化锆（ZrO₂）纳米粒子进行氨基修饰，并成功地将其掺入聚醚酰亚胺（PEI）基体中。研究了PEI/ZrO₂-AMEO纳米复合材料在25°C至150°C温度下的介电性能、击穿强度和储能性能。研究发现，将具有适度介电常数的中等带隙ZrO₂与深阱界面处的极性基团相结合，可以提供一种同时提高聚合物电介质介电常数和击穿强度的有效策略。

结果显示，含有ZrO₂-AMEO的复合材料在高温下表现出优异的储能性能。特别地，具有3vol%ZrO₂ AMEO的PEI基复合材料在150°C下显示出3.1 J/cm³的最大放电能量密度（Ud），比纯PEI高出90%。

该项研究可能有助于更好地开发在高温下应用的聚合物基电介质复合材料。

附：英文原文

Title: Significantly Enhanced Energy Storage Performances of PEI-based Composites Utilizing Surface Functionalized ZrO2 Nanoparticles for High-Temperature Application

Author: Qing-Qing Liu, Qiu-Hao Lin, Xiao-Dong Qi, Nan Zhang, Ting Huang, Jing-Hui Yang, Yong Wang

Issue&Volume: 2023-12-07

Abstract: Polymer dielectrics with a high energy density and an available energy storage capacity have been playing an important role in advanced 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 °C to 150 °C. 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 increase the dielectric constant and breakdown strength of polymer dielectrics. As a result, the composites containing ZrO2-AMEO exhibit excellent energy storage performance at elevated temperatures. Specially, the PEI-based composites with 3 vol% ZrO2-AMEO display a maximum discharged energy density (Ud) of 3.1 J/cm3 at 150 °C, presenting 90% higher than that of neat PEI. This study may help to better develop the polymer-based dielectric composite applied at elevated temperatures.

DOI: 10.1007/s10118-024-3068-x

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-024-3068-x/