Abstract Polymer nanocomposite dielectrics have drawn increasing attention recent years. However, dispersion of high-e nanoparticles causes decreased breakdown strength and increased loss tangent. High dielectric permittivity, high breakdown strength, low dielectric loss and high charging-discharging energy efficiency are hard to achieve at the same time. In this research, in order to achieve all these goals, a combination method consists of cross-linking and dispersion of high-e nanoparticles was carried out. The cross-linking points limit polymer chain mobility in the amorphous phase, providing lower dielectric loss and lower conductivity. Therefore, breakdown strength increased from 402.8 MV/m of PVDF to 517.2 MV/m of cross-linked PVDF. By dispersing coated BaTiO3 nanoparticles, followed by cross-linking, cross-linked nanocomposites with higher e, higher breakdown strength and higher efficiency compared with the polymer matrix were prepared. The maximum discharging energy density reached up to 14.1 J/cm3, about 70% higher than 8.02 J/cm3 for pristine PVDF. This research provides us a novel approach to achieve all these goals by a combination of cross-linking and dispersion of coated BT nanoparticles.

中文翻译：

---

通过聚偏二氟乙烯/BaTiO3纳米复合材料的交联实现高介电常数、高击穿强度和高效率

摘要 近年来，聚合物纳米复合电介质引起了越来越多的关注。然而，高电子纳米粒子的分散会导致击穿强度降低和损耗角正切增加。高介电常数、高击穿强度、低介电损耗和高充放电能量效率难以同时实现。在这项研究中，为了实现所有这些目标，进行了一种由高电子纳米粒子的交联和分散组成的组合方法。交联点限制了聚合物链在非晶相中的流动性，从而提供了较低的介电损耗和较低的导电性。因此，击穿强度从 PVDF 的 402.8 MV/m 增加到交联 PVDF 的 517.2 MV/m。通过分散包覆的 BaTiO3 纳米粒子，然后交联，制备了与聚合物基体相比具有更高e、更高击穿强度和更高效率的交联纳米复合材料。最大放电能量密度达到 14.1 J/cm3，比原始 PVDF 的 8.02 J/cm3 高约 70%。这项研究为我们提供了一种通过结合交联和分散涂覆的 BT 纳米颗粒来实现所有这些目标的新方法。