Dielectric and Energy Storage Properties of Ferroelectric Polymers by Blending Polar Rubber at Elevated Temperatures

In this paper, we fabricate all-polymer ferroelectric films by combining nitrile butadiene rubber (NBR) and P(VDF-HFP) to enhance the dielectric performances at high temperature conditions. We show that the NBR and P(VDF-HFP) have good compatibility. The permittivity increases while loss decreases for P(VDF-HFP)-based films with the addition of NBR. Meanwhile, by designing the mass ratio of NBR and P(VDF-HFP), the breakdown strength could be improved at elevated temperatures. As a consequence, the high permittivity and breakdown strength contribute to the improved discharged energy density of 0.786 J/cm ³ for the optimized blended films. the improved overall performances of all-polymer films make them potentially used as large-area dielectric films for energy storage applications.