Constructing nanocomposites with robust covalent connection between nanoparticles and polymer for high discharged energy density and excellent tensile properties

作     者：Jiachen Ma Yabin Zhang Yan Zhang Luqing Zhang Shuxiang Zhang Xuchuan Jiang Hong Liu Jiachen Ma;Yabin Zhang;Yan Zhang;Luqing Zhang;Shuxiang Zhang;Xuchuan Jiang;Hong Liu

作者机构：Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022ShandongChina Institute for Advanced Interdisciplinary ResearchUniversity of JinanJinan 250022ShandongChina State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100ShandongChina Institute for Smart Materials&EngineeringUniversity of JinanJinan 250022ShandongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第5期

页      面：195-205页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the Major Science and Technology Innovation Project of Shandong Province of China(2019JZZY020231 and 2019JZZY020232) 

主　　题：Dielectric materials Energy density Mechanical properties Interfacial adhesion Breakdown strength 

摘      要：High discharged energy density and excellent flexible properties in dielectric materials are significantly sought to meet the rapid advancements in the electronics industry. In this study, covalent bonds are constructed between poly(vinylidene fluoride-chlorotrifluoroethylene), which contains olefinic bonds, and thiol-modified BaTiO_(3) at the interface before the nanocomposite films are fabricated. The presence of the covalent bonds is proved to promote the dispersibility of the modified BaTiO_(3) and enhance the interfacial adhesion between the modified BaTiO_(3) and the polymer, followed by a remarkably positive effect in suppressing the dielectric loss(tanδ) and increasing the breakdown strength(Eb) of the nanocomposite films. In addition, the cross-linking treatment in the preparation process is found to be favourable for improving the mechanical properties of the nanocomposite films, which benefits the enhancement of Eb. Furthermore, at 400% elongation, the stretched nanocomposite film doped with 5 vol% modified BaTiO_(3) exhibits an Eb15.6% greater than that of the unstretched film, and the discharged energy density reaches 11.4 J/cm^(3) with a high discharge energy efficiency of 84.5%. This study provides a novel strategy for preparing flexible nanocomposites with powerful interfacial adhesion at high filler content to achieve high discharged energy density.