Simultaneous Realization of Significantly Enhanced Breakdown Strength and Moderately Enhanced Permittivity in Layered PMMA/P(VDF–HFP) Nanocomposites via Inserting an Al₂O₃/P(VDF–HFP) Layer

Abstract

Paraelectric/ferroelectric bilayer composites are promising candidates for high-performance dielectric capacitors. However, the energy densities of these composites need to be further improved to satisfy the miniaturization of electronic devices. Herein, an Al2O3/P­(VDF–HFP) buffer layer is inserted between a paraelectric PMMA layer and a ferroelectric P­(VDF–HFP) layer, forming a novel trilayer structure. It is interesting to find that the buffer layer effectively alleviates the huge electric field gap between the P­(VDF–HFP) layer and PMMA layer, yielding substantially improved breakdown strengths (>600 kV/mm), which are over 140% that of the bilayer P­(VDF–HFP)/PMMA composite (∼425 kV/mm). In addition, the introduction of the buffer layer also results in improved interfacial polarization, hence, the moderately elevated permittivity. Consequently, a high energy density of 10.03 J/cm3, which is about 260% that of the bilayer P­(VDF–HFP)/PMMA composite (∼3.9 J/cm3), is achieved at 600 kV/mm. This work offers a facile strategy to achieve dielectric composites with high breakdown strengths, which is illuminating for the design of high-voltage energy-storage capacitors.

Preparation of Poly(guaiacol methacrylate-methyl methacrylate) Dielectric Films through Biobased Origin Guaiacol

“…Polymer film capacitors, as a kind of physical energy storage device, have the advantages of ultrahigh power density and the ability to store and release energy very quickly , and are extensively employed in capacitor-related industries, such as pulsed-power technology and electric vehicle technology. , The most widely used commercially in film capacitors is the biaxially oriented polypropylene film, which has high breakdown strength, but its energy storage density ( U e ) is low­(∼2 J/cm 3 ) cannot match the development of the electric industry . The development of dielectric materials with increased energy storage density is crucial. , …”

“…5 The development of dielectric materials with increased energy storage density is crucial. 6,7 Moreover, most of the currently studied dielectric film substrate feedstocks that come from fossil energy sources are nonrenewable, nonbiodegradable petroleum-derived synthetic polymers. Accelerating the research and development of biomass-derived dielectric materials is an inevitable way to realize green chemistry.…”

Inhibition of Oxygen Vacancy Derived from Donor Doping in Relaxor Ferroelectric Films for Improving Dielectric Energy Storage

“…Relaxor ferroelectric capacitors have received extensive attention for energy storage due to their low energy loss and high recovery energy efficiency . However, they suffer from the comparatively low energy storage density due to the adverse coupling between the breakdown electric field and the polarization since both the high maximum polarization P max and breakdown field strength E BDS are necessary for high energy storage density. − Therefore, how to improve E BDS and P max simultaneously to obtain excellent energy storage characteristics has become the recent focus …”

Gold Sputtering at the Interfaces: An Easily Operated Strategy for Enhancing the Energy Storage Capability of Laminated Polymer Dielectrics

“…In recent years, studies have shown that layer-structured polymers have huge potential for simultaneously realizing high ε r and high E b via combining a high ε r layer and a high E b layer by means of hot pressing or layer-by-layer casting. − It should be noted that, in the layered structures, in addition to the intrinsic high ε r and high E b of the separate layers, the interfaces between adjacent layers also play a critical role in improving ε r and E b . Specifically, the interfaces can hinder the growth of the breakdown path, which contributes to enhanced E b .…”