文献类型：期刊文献

英文题名：Ultra-low dielectric loss and high thermal stability achieved by hierarchical microcapacitor structure in nanocomposites via surface topological modulation

作者：Ni, Xinyao[1];Wang, Xinhua[1];Lin, Jingyu[1];Liu, Xiaoyun[1];Cui, Zhong-Kai[2];Zuo, Peiyuan[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Southern Med Univ, Sch Basic Med Sci, Guangzhou 510515, Peoples R China

年份：2023

卷号：31

外文期刊名：MATERIALS TODAY ENERGY

收录：;EI(收录号：20230213350513);WOS:【SCI-EXPANDED(收录号:WOS:000950654000001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 22171086) , Natural Science Foundation of Shanghai (20ZR1414600) .

语种：英文

外文关键词：Dielectric nanocomposites; Polyaniline; High -temperature; Oriented nanorods; BaTiO3

摘要：The urgent need for miniaturized high-reliable electronic devices requires polymer film capacitors with stable dielectric properties under extreme environments. The traditional surface coating structure can barely boost the performance of energy storage dielectric materials, which are confronted with a high dielectric loss and low breakdown strength. Herein, reduced polyaniline (R-PANI) grows in the form of vertically oriented nanorods on the surface of porous carbon embedded with ultrafine BaTiO3, resulting in a hierarchical microcapacitor structure. The surface topology modulation of R-PANI dramatically in-creases the aspect ratio of the nanoparticles perpendicular to the external electric field, thus suppressing the leakage current and restraining the subsequent dielectric loss of the nanocomposite. The nano -composite filled with 8 wt% C@BT@R-PANI exhibits a breakdown strength of 316.50 MV/m, a high dielectric constant of 66.8, and an ultra-low dielectric loss of 0.00663 at 1 kHz. Under a moderate electric field of 150 MV/m, the energy density increases to 2.75 J/cm3 and the charge-discharge efficiency (h) reaches 80.09%. In addition, the nanocomposite exhibits an excellent dielectric-thermal stability in the range of 30-150 degrees C, making it a potential candidate for high-temperature dielectric materials.(c) 2022 Elsevier Ltd. All rights reserved.