POLYMERS AND POLYMER MATRIX COMPOSITES |
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Research Progress of Polymer Based Composites with Multilayer Film to Improve the Dielectric Energy Storage Density |
JI Xumin1, SUN Binzhou1, LI Cong1, HU Penghao1,2,*
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1 Institute for Advanced Materials & Technology, University of Science & Technology Beijing, Beijing 100083, China 2 Research Center for New Energy Composite Materials, Foshan (Southern China) Institute for New Materials, Foshan 528200, Guangdong, China |
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Abstract Electrostatic capacitor is a component that can store electric charges. It is composed of electrode at both ends and dielectric material in the middle. The energy density that can be stored depends on the dielectric properties of the intermediate dielectric material. Polymer dielectric materials have been widely used due to their ultra-high breakdown strength, easy processing and low cost, but their lower dielectric constant limits the increase in energy density. The introduction of high-permittivity nanofillers into traditional single-layer polymer films can achieve an increase in permittivity, but will significantly deteriorate the breakdown strength of the polymer. In recent years, using the co-extrusion film technology and electrospinning methods to process polymer films into multilayer films has made great progress, which can solve the inverted relationship between dielectric constant and breakdown field strength to a certain extent. The results based on the phase field simulation also proved the excellent performance of the multilayer film. While maintaining the high breakdown strength of the polymer itself, it also achieved an increase in the dielectric constant and improved the discharged energy density of the polymer film. Compared with the energy density of commercial biaxially oriented polypropylene (BOPP) film, that of newly developed materials has increased by 200% or even higher. This paper summarizes the research progress of improving the energy density of composite dielectrics through the design of multilayer structures in recent years, and focuses on the structural design of the interlayer interface in composite materials and the positive effect on hindering carrier transport.
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Published: 10 May 2022
Online: 2022-05-09
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Fund:Guangdong Basic and Applied Basic Research Foundation(2020B1515120074) and Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities) (FRF-IDRY-19-003). |
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