The simple synthesis of all‐organic polymer bilayer films: Achieving simultaneous enhancements in energy storage density and efficiency

Author:

Liu Shiyu1,Zhang Wenchao1ORCID,Guan Feng1,Yao Yuanhang1,Yue Dong2,Feng Yu1

Affiliation:

1. Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education, Harbin University of Science and Technology Harbin People's Republic of China

2. School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin People's Republic of China

Abstract

AbstractAll‐organic dielectric polymers with excellent capacitive energy storage capabilities have great potential applications in the fields of modern electronics and power systems. However, it is still challenging to achieve simultaneous improvements in both energy density and efficiency in these all‐organic dielectric polymers. This work proposes the all‐organic bilayer composite films with ferroelectric polymer poly(vinylidene fluoride‐hexafluoropropylene) (P(VDF‐HFP)) and linear polymer fluorene polyester (FPE) as the energy storage dielectrics for film capacitors. Compared with pure FPE films, the bilayer composite films exhibit improved dielectric constant. What is more outstanding is that the bilayer composite films has higher energy storage density and energy storage efficiency under the same electric field compared with the pure P(VDF‐HFP) film. Particularly, an outstanding Ud of 7.00 J/cm3 accompanied with great η of 95.9% has been delivered in the resulting bilayer composite films via optimizing the P(VDF‐HFP) content (22.2 vol%) at 520 kV/mm. The compatibility of the two polymers was discussed by simulating the potential distribution of the two polymer molecular chains. This work opens up a new way to prepare compatible polymer flexible capacitor films on a large scale.

Funder

China Postdoctoral Science Foundation

National Natural Science Foundation of China

Publisher

Wiley

Subject

Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry

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