Inorganic/polymer nanocomposite films have attracted pronounced attention for electric energy storage applications since their high power energy density and fast charge-discharge ability. In this work, the flexible nanocomposite films composed by the paraelectric SrTiO₃ nanofibers (ST NFs) and poly(vinylidene fluoride) (PVDF) were prepared by a solution cast method. The ST NFs, synthesized by an electrospinning method, were coated with a dense and robust dopamine layer which could effectively improve the filler-matrix distributional homogeneity and compatibility. The composite film with an optimized filler content illustrates a high discharge energy density of 9.12 J/cm³ at 360 MV/m, which is about 625% over the biaxially oriented polypropylenes (BOPP) (1.2 J/cm³ at 640 MV/m). Moreover, the composite film shows a superior power density of 2.31 MW/cm³ and ultra-fast discharge speed of 178 ns. Therefore, the present approach might be extended to the fabrication of similar polymeric nanocomposites for high-performance capacitor energy storage devices.

无机/聚合物纳米复合薄膜因其高功率能量密度和快速的充放电能力而在电能存储应用中引起了广泛的关注。在这项工作中，通过溶液流延法制备了由顺电SrTiO ₃纳米纤维（ST NFs）和聚偏二氟乙烯（PVDF）组成的柔性纳米复合膜。通过静电纺丝法合成的ST NFs涂有致密而坚固的多巴胺层，可以有效提高填料-基体的分布均匀性和相容性。具有最佳填料含量的复合薄膜在360 MV / m时显示出9.12 J / cm ³的高放电能量密度，是双轴取向聚丙烯（BOPP）（1.2 J / cm ³）的约625％640 MV / m）。此外，该复合膜显示出2.31 MW / cm ³的优异功率密度和178 ns的超快放电速度。因此，本方法可以扩展到用于高性能电容器能量存储装置的类似聚合物纳米复合材料的制造。