Achieving high energy density at a low electric field of high-temperature sandwich-structured polymer dielectric composite by PVDF crystallinity regulation

Abstract

Polarization enhanced by PVDF crystallinity regulation, resulting in high energy density at 150 °C.

Progress of Polymer-Based Dielectric Composites Prepared Using Fused Deposition Modeling 3D Printing

“…To improve the deficiency of single fillers, researchers have constructed topologies including sandwich or multilayer structures by incorporating two or more fillers into a polymer matrix at the same time or by incorporating nanoparticles into multiple polymer blends, where the additional insulating layers introduced can increase or maintain the breakdown strength while increasing the relative dielectric constant [105][106][107].…”

Sandwich-Structured PC/PVDF-Based Energy Storage Dielectric with Inorganic Doping to Regulate Electric Field Distribution

“…32 In recent years, many research studies have been devoted to constructing multilayer dielectric structures to effectively suppress the formation of conductive paths so that multilayer dielectric films can obtain more excellent insulation and energy storage properties. 33,34 Among them, the preparation of sandwich-structured films with an outer insulating layer on both sides and a central polarization layer is the main research direction in the field of multilayer dielectrics at present. For instance, Sun 32 et al achieved simultaneous enhancement of dielectric constant and breakdown strength of the composite dielectric and obtained an energy storage density of 10.54 J/cm 3 and 70% charge− discharge efficiency at a field strength of 337 kV/mm.…”

“…Numerous research studies have been done to increase the dielectric constant of composite media by doping the whole media matrix with high dielectric inorganic fillers, which in turn increases the energy storage density, in order to produce more outstanding energy storage density. − Among them, TiO 2 is widely used in the study of modification of various composite media because of its high dielectric constant (ε ∼ 114) and wide band gap (3.0–3.2 eV), which can make the composite media obtain balanced dielectric properties and breakdown performance. , However, a substantial local electric field distortion might result from the dielectric mismatch between the polymer substrate and the inorganic filler, and the accompanying degradation of breakdown performance cannot be avoided. , Therefore, how to simultaneously improve the dielectric constant and breakdown strength of polymer composites is the key to achieve high energy storage density . In recent years, many research studies have been devoted to constructing multilayer dielectric structures to effectively suppress the formation of conductive paths so that multilayer dielectric films can obtain more excellent insulation and energy storage properties. , Among them, the preparation of sandwich-structured films with an outer insulating layer on both sides and a central polarization layer is the main research direction in the field of multilayer dielectrics at present. For instance, Sun et al achieved simultaneous enhancement of dielectric constant and breakdown strength of the composite dielectric and obtained an energy storage density of 10.54 J/cm 3 and 70% charge–discharge efficiency at a field strength of 337 kV/mm.…”

Research on the energy storage performance of laminated composites based on multidimensional co-design in a broad temperature range

“…12 The large volume proportion and use of additional cooling systems due to polymer limitations are not in line with the modern design concept of light weight and efficient energy-storage capability. [13][14][15] Therefore, there is an urgent need to develop polymer dielectrics that can provide both high temperature stability and high energy storage performance.…”