The preparation of large-aspect-ratio nanofillers is challenging due to the complicated and expensive artificial processing procedures and low yields, obstructing scale-up production of 1D nanofillers/polymer dielectric nanocomposites. In this paper, a kind of natural sepiolite nanofiber was utilized to fabricate scale-up of PVDF-based dielectric nanocomposites. The sepiolite nanofibers were modified by aminopropyltriethoxysilane (denoted as APTES@Sep) and 1H,1H,2H,2H-perfluoroheptadecane trimethysiloxane (denoted as PFDTES@Sep), respectively, before being incorporated into PVDF. The effect of nanfibers loading and modifiers on the dielectric behaivor and energy stroage properties of nanocomposites was investigated. As results, the nanocomposites with 7.5 vol% PFDTES@Sep exhibited highest permittivity of 16.4 at 10³ Hz originating from well dispersibility, strong interfacial polarization and orientation polarization. The nanocomposites with 2.5 vol% APTES@Sep displayed maximal discharged energy density of 7.2 J·cm⁻³ owing to highest breakdown strength. This work provides a simple and cheap strategy for developing high performance flexible dielectric nanocomposites, which is suitable for large-scale preparation.

由于复杂且昂贵的人工加工程序和低产量，大纵横比纳米填料的制备具有挑战性，阻碍了一维纳米填料/聚合物介电纳米复合材料的大规模生产。在本文中，一种天然的海泡石纳米纤维被用来制造基于PVDF的介电纳米复合材料。将海泡石纳米纤维分别用氨丙基三乙氧基硅烷（表示为APTES @ Sep）和1H，1H，2H，2H-全氟庚烷三甲基硅氧烷（表示为PFDTES @ Sep）进行改性，然后将其掺入PVDF中。研究了纳米纤维负载量和改性剂对纳米复合材料介电行为和能量储存性能的影响。结果，具有7.5 vol％PFDTES @ Sep的纳米复合材料在10 ^3时显示出最高的16.4介电常数。源自良好分散性，强界面极化和取向极化的Hz。由于最高的击穿强度，具有2.5vol％的APTES @ Sep的纳米复合材料显示出最大的放电能量密度为7.2J·cm ^-3。这项工作为开发适用于大规模制备的高性能柔性介电纳米复合材料提供了一种简单而廉价的策略。