Gradient design of ultrasmall dielectric nanofillers for PVDF-based high energy-density composite capacitors

被引：55

作者：

Hao, Yanan ^{[1
]}

Feng, Zunpeng ^{[1
]}

He, Zhengda ^{[1
]}

Zhang, Jiameng ^{[1
]}

Liu, Xiaoming ^{[2
,3
]}

Qin, Jing ^{[1
]}

Guo, Limin ^{[1
]}

Bi, Ke ^{[1
]}

机构：

[1] Beijing Univ Posts & Telecommun, Sch Sci, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China

[2] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China

[3] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China

来源：

MATERIALS & DESIGN | 2020年 / 189卷

基金：

中国国家自然科学基金;

关键词：

Energy storage; Polymer nanocomposites; Interfaces; Dielectric; Core-shell; POLYMER NANOCOMPOSITES; HIERARCHICAL INTERFACES; STORAGE PROPERTIES; FILMS; BATIO3-AT-TIO2; PERMITTIVITY; CONSTANT; BATIO3;

D O I：

10.1016/j.matdes.2020.108523

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dielectric capacitors are key devices in pulsed power systems for their high power density. To improve the energy density, compact nanocomposite films comprising PVDF polymer and core-shell BaTiO3@TIO2 nanoparticles are prepared, in which the BaTiO3 (d similar to 8 nm) nanoparticies are encapsulated by the amorphous TiO2 shell layer. Compared to the conventional BaTiO3/PVDF nanocomposite, the BaTiO3@TiO2/PVDF nanocomposite in this report takes advantage of the small particle size and the gradient dielectric design of the interface, which enhances the electric displacement as high as 65% and the breakdown strength of 20% simultaneously. A maximal discharged energy density of 11.34 J . cm(-3) is achieved under an electric field of 420 kV. mm(-1) in the nanocomposite film containing 5 vol% BaTiO3@10 wt%TiO2. Therefore, the gradient design of ultrasmall dielectric nanofillers shows high potential in fabrication of high energy-density nanocomposite. (C) 2020 Published by Elsevier Ltd.

引用

页数：7

共 36 条

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