Abstract
AbstractPVDF‐based materials have gained significant attention in the field of dielectric energy storage due to their excellent breakdown strength and energy storage density. However, the improvement has been limited by their low dielectric constant. In this article, the PVDF‐TrFE composite films with core‐shell structured (1‐x)Ba(Ti0.8Zr0.2)O3‐x(Ba0.7Ca0.3)TiO3@TiO2(BZT‐xBCT@TiO2) nanofibers were fabricated using hot pressing, electrospinning, and hydrothermal method. Doping the PVDF‐TrFE composite film with 3 wt% BZT‐0.6BCT increased its energy storage density to 14.2 J·cm−3. When the doped ceramic fibers were coated with the TiO2 core‐shell of ~75 nm, the composite film exhibits improved breakdown field strength (Eb) of 365 kV mm−1, enhanced energy storage density (Ue) of 18.71 J·cm−3, and superior energy storage efficiency (η) of 60.03%.
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