Realizing Rationally-Balanced Dielectric Properties in Fluoropolymer/Cr 2 AlC MAX Composites Modified by 2D-BN
- PDF / 3,897,017 Bytes
- 7 Pages / 595 x 842 pts (A4) Page_size
- 102 Downloads / 205 Views
Article
DOI 10.1007/s13233-020-8164-3
www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Realizing Rationally-Balanced Dielectric Properties in Fluoropolymer/ Cr2AlC MAX Composites Modified by 2D-BN Qin Li Junquan Zhou Yanhui Chen Xiaofeng Xia Maolin Bo Qihuang Deng* Yefeng Feng*
Key Laboratory of Extraordinary Bond Engineering and Advance Materials Technology (EBEAM) of Chongqing, School of Materials Science and Engineering, Yangtze Normal University, No. 16, Juxian Avenue, Fuling District, Chongqing, P. R. China, 408100
Received August 4, 2020 / Revised October 1, 2020 / Accepted October 3, 2020
Abstract: Polymer/conductor composite dielectric materials have a high dielectric constant. In recent years, composite dielectrics have become a study hotspot in highdensity energy storage capacitors. However, high dielectric loss and high electrical conductivity make the application of the composite materials very limited. In order to obtain composite materials with high dielectric constant, low dielectric loss and low conductivity, we added the insulating boron nitride (BN) filler into polymer/Cr2AlC composites. As a conductive filler, Cr2AlC ternary-layered-compound (MAX) ceramic has an interface polarization with the polymer matrix, thereby increasing the dielectric constant of the composites. The insulating BN has a very low electrical conductivity, which can effectively reduce the electrical conductivity and dielectric loss of the composites. Compared with the binary polymer/Cr2AlC composite materials, the ternary polymer/Cr2AlC/BN composite materials can achieve the low dielectric loss and low conductivity as well as properly-lowered dielectric constant. The ternary composite material filled with 10 wt% Cr2AlC and 2 wt% BN has a dielectric constant of about 30, a dielectric loss of about 0.7 and a conductivity of about 4.6×107 S m-1 at 100 Hz. In this work, high-performance composite dielectrics were prepared through good cooperation between conductive and insulating ceramic fillers, which might provide an idea for design of promising energy storage capacitors. Keywords: MAX, dielectric constant, dielectric loss, BN, composite film.
1. Introduction With the rapid development of the electrical power industry now, the demand for high-density capacitors with small sizes is increasing.1 Therefore, capacitors with high energy storage density have received more and more attention. To obtain a capacitor with a high energy storage density, the selection of a dielectric material is very important. The high energy storage density of dielectric materials depends on the high dielectric constant or high electrical breakdown strength.2 However, the balance between dielectric constant and electrical breakdown strength has become a very critical technical bottleneck, at present. To obtain a relatively high energy storage density, researchers should find a balance between the high dielectric constant and the high breakdown strength to achieve the optimization.3,4 At the same time, Acknowledgments: This work was supported
Data Loading...
