All‐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.
Due to the limitations of dielectric, insulating and mechanical properties, pure polymers could not satisfy the requirements of technological development.Using inorganic fillers with excellent performance to modify it is the mainstream method at present. Ternary hybrid polymer composites can use fillers with excellent dielectric properties to improve their dielectric properties, showing potential in improving electrical insulation, dielectric, and other fields. In this work, fluorene polyester (FPE) films of different components are prepared by the solution blending method using zero-dimensional silica (SiO 2 ) nanoparticles and two-dimensional boron nitride nanosheets (BNNS) as fillers.Compared with SiO 2 /FPE composite films, ternary films exhibit better dielectric properties, short-term breakdown strength and corona-resistant lifetime.By investigating the interface features of BNNS, SiO 2 nanoparticles and FPE matrix as well as the microstructure and properties of the films, the synergism mechanism of BNNS and SiO 2 nanoparticles on the performance of FPE composite films is explored. The dielectric properties of the composites are investigated, including dielectric constant, breakdown strength, and corona-resistant lifetime. This article focuses on clarifying the key role of BNNS in the electrical properties of ternary films and provides a theoretical basis for expanding the application of 2D materials in the field of high insulation.
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