Abstract
High discharged energy density and charge–discharge efficiency, in combination with high electric breakdown strength, maximum electric displacement and low residual displacement, are very difficult to simultaneously achieve in single-component polymer dielectrics. Plenty of researches have reported polymer based composite dielectrics filled with inorganic fillers, through complex surface modification of inorganic fillers to improve interface compatibility. In this work, a novel strategy of introducing environmentally-friendly biological polyester into fluoropolymer matrix has been presented to prepare all-organic polymer composites with desirable high energy storage properties by solution cast process (followed by annealing or stretching post-treatment), in order to simplify the preparation steps and lower the cost. Fluoropolymer with substantial ferroelectric domains (contributing to high dielectric response) as matrix and poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with excellent linear polarization property (resulting in high breakdown strength) as filler were employed. By high-temperature annealing, the size of ferroelectric domains could be improved and interfacial air defects could be removed, leading to elevated high energy storage density and efficiency in composite. By mono-directional stretching, the ferroelectric domains and polyester could be regularly oriented along stretching direction, resulting in desired high energy storage performances as well. Besides, linear dielectric components could contribute to high efficiency from their strong rigidity restrain effect on ferroelectric component. This work might open up the way for a facile fabrication of promising all-organic composite dielectric films with high energy storage properties.
Highlights
In recent decades, dielectric capacitors have attracted extensive attention in the fields of modern electronic and electrical power systems, ascribed to their fast charge–discharge speed and high energy storage density [1]
Linear dielectrics have an energy density that is proportional to the square of breakdown strength and to the first power of dielectric constant [4], such as biaxially oriented polypropylene (BOPP)
This work aims at providing a novel strategy for preparing promising composite dielectric materials, through building all-organic composites containing ferroelectric and linearly dielectric components as well as utilizing material post-treatments to further improve the energy storage performances of composites
Summary
Dielectric capacitors have attracted extensive attention in the fields of modern electronic and electrical power systems, ascribed to their fast charge–discharge speed and high energy storage density [1]. Novel dielectric materials with further elevated high discharged energy density and charge–discharge efficiency are highly desired for capacitive applications [2]. It has been widely accepted that the discharged energy density of any material is co-decided by two crucial factors, namely dielectric constant and electric breakdown strength [3]. An improvement of either dielectric constant or breakdown strength can result in an increase of discharged energy density. Linear dielectrics have an energy density that is proportional to the square of breakdown strength and to the first power of dielectric constant [4], such as biaxially oriented polypropylene (BOPP). Scientific Research Initiation Projects of Yangtze Normal University, grant numbers 2017KYQD33 and 2017KYQD34
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