Polymer-based dielectric nanocomposites with high dielectric constant and low loss have been widely used for energy storage applications in power electronics and power delivery systems. However, there are still changes in preparing polymer-based dielectric nanocomposites with the suppressed loss (tan δ) and maintain breakdown strength (E_b) through simple compound method. In this work, a simple approach to fabricate outstanding comprehensive performance dielectric composites was proposed by cooperating molybdenum disulfide-polypyrrole (MoS₂-PPy) hybrids with polyvinylidene Fluoride (PVDF). The MoS₂-PPy hybrids were prepared by in situ polymerization of pyrrole with exfoliated MoS₂ nanosheets, showing a “sandwich-like” structure of PPy/MoS₂/PPy. MoS₂-PPy hybrids significantly influenced the dielectric properties of their composites. As result, PVDF/MoS₂-PPy composites achieved high dielectric constant (149.5@1 kHz), suppressed dielectric loss (0.19@1 kHz) and high breakdown strength (250.6 MV m⁻¹). The emphasized reasons of high dielectric property are the enhanced interfacial polarization and formation of nano- and micro-capacitor networks. This work could provide an effective method to design and improve the performance of polymer-based dielectric nanocomposites for power system and energy storage applications.

具有高介电常数和低损耗的基于聚合物的介电纳米复合材料已被广泛用于电力电子和电力输送系统中的储能应用。然而，仍然有改变在制备基于聚合物的纳米复合材料的电介质与抑制损耗（tanδ δ），并且维持击穿强度（Ë _b）通过简单的化合物的方法。在这项工作中，提出了一种通过将二硫化钼-聚吡咯（MoS ₂ -PPy）杂化物与聚偏二氟乙烯（PVDF）配合使用来制造出色的综合性能介电复合材料的简单方法。MoS ₂ -PPy杂化物通过吡咯与脱落的MoS ₂原位聚合制备纳米片，显示出PPy / MoS ₂ / PPy的“三明治状”结构。MoS ₂ -PPy杂化物显着影响其复合材料的介电性能。结果，PVDF / MoS ₂ -PPy复合材料实现了高介电常数（149.5@1 kHz），抑制的介电损耗（0.19@1 kHz）和高击穿强度（250.6 MV m ^-1）。高介电性能的突出原因是增强的界面极化以及纳米和微电容器网络的形成。这项工作可以提供一种有效的方法来设计和改善用于电力系统和能量存储应用的聚合物基介电纳米复合材料的性能。