Enhanced dielectric properties and energy storage of the sandwich-structured poly(vinylidene fluoride-co -hexafluoropropylene) composite films with functional BaTiO3 @Al2 O3 nanofibresInspec keywordsOther keywords

Polymer-based composites with ceramic fillers could combine the advantages of both, which can be potentially used in electrical and electronic technology. In this work, the barium titanate (BaTiO3) nanofibres and the core-shell structured BaTiO3 @Al-2 O-3 nanofibres with Al-2 O-3 insulation layer coated on the BaTiO3 surface were both prepared via the electrospinning method. The appropriate incorporation of the ceramic nanofibres effectively improves the dielectric properties and energy density of the polymer. Moreover, the poly(vinylidene fluoride-co -hexafluoropropylene)-based composite films with the three-layer sandwich structure were fabricated to further promote the dielectric properties. The results show that the outer two layers with a higher content of BaTiO3 nanofibres can make more contribution to the improved permittivity of the composites. In addition, the introduction of the interlayer with low loading of BaTiO3 @Al-2 O-3 nanofibres promotes the breakdown strength. This work gives rise to the potential in high energy storage applications.