Roles of Al2O3@ZrO2 Particles in Modulating Crystalline Morphology and Electrical Properties of P(VDF-HFP) Nanocomposites

Abstract

Polymer materials with excellent physicochemical and electrical properties are desirable for energy storage applications in advanced electronics and power systems. Here, Al2O3@ZrO2 nanoparticles (A@Z) with a core-shell structure are synthesized and introduced to a P(VDF-HFP) matrix to fabricate P(VDF-HFP)/A@Z nanocomposite films. Experimental and simulation results confirm that A@Z nanoparticles increase the crystallinity and crystallization temperature owing to the effect of the refined crystal size. The incorporation of A@Z nanoparticles leads to conformational changes of molecular chains of P(VDF-HFP), which influences the dielectric relaxation and trap parameters of the nanocomposites. The calculated total trapped charges increase from 13.63 μC of the neat P(VDF-HFP) to 47.55 μC of P(VDF-HFP)/5 vol%-A@Z nanocomposite, indicating a substantial improvement in trap density. The modulated crystalline characteristic and interfaces between nanoparticles and polymer matrix are effective in inhibiting charge motion and impeding the electric conduction channels, which contributes to an improved electrical property and energy density of the nanocomposites. Specifically, a ~200% and ~31% enhancement in discharged energy density and breakdown strength are achieved in the P(VDF-HFP)/5 vol%-A@Z nanocomposite.

Temperature-Resistant Intrinsic High Dielectric Constant Polyimides: More Flexibility of the Dipoles, Larger Permittivity of the Materials

“…With the continuous development of electronic devices and the electronics industry, dielectric capacitors have shown great potential and impact in photovoltaic devices [ 1 , 2 , 3 ], new energy vehicles [ 4 , 5 , 6 ], inverters [ 7 , 8 , 9 ], and other industries. Compared to inorganic dielectrics [ 10 , 11 , 12 ] and polymer nanocomposites [ 13 , 14 , 15 , 16 , 17 , 18 ], intrinsic polymer dielectrics have gradually become the research hotspot because of their good structural designability, flexibility, solution processing, low processing temperature, and high breakdown field strength. One of the most important traditional polymer dielectrics used in film capacitors is biaxially oriented polypropylene (BOPP), which has a high breakdown strength and a low dielectric loss.…”