Polymer/conductor composite dielectric materials have a high dielectric constant. In recent years, composite dielectrics have become a study hotspot in high-density energy storage capacitors. However, high dielectric loss and high electrical conductivity make the application of the composite materials very limited. In order to obtain composite materials with high dielectric constant, low dielectric loss and low conductivity, we added the insulating boron nitride (BN) filler into polymer/Cr₂AlC composites. As a conductive filler, Cr₂AlC ternary-layered-compound (MAX) ceramic has an interface polarization with the polymer matrix, thereby increasing the dielectric constant of the composites. The insulating BN has a very low electrical conductivity, which can effectively reduce the electrical conductivity and dielectric loss of the composites. Compared with the binary polymer/Cr AlC composite materials, the ternary polymer/Cr AlC/BN composite materials can achieve the low dielectric loss and low conductivity as well as properly-lowered dielectric constant. The ternary composite material filled with 10 wt% Cr₂AlC and 2 wt% BN has a dielectric constant of about 30, a dielectric loss of about 0.7 and a conductivity of about 4.6 × 10⁻⁷ S m⁻¹ at 100 Hz. In this work, high-performance composite dielectrics were prepared through good cooperation between conductive and insulating ceramic fillers, which might provide an idea for design of promising energy storage capacitors.

聚合物/导体复合介电材料具有高介电常数。近年来，复合电介质已成为高密度储能电容器研究的热点。然而，高的介电损耗和高的电导率使得复合材料的应用非常受限。为了获得具有高介电常数，低介电损耗和低电导率的复合材料，我们在聚合物/ Cr ₂ AlC复合材料中添加了绝缘氮化硼（BN）填料。Cr ₂作为导电填料AlC三元复合（MAX）陶瓷与聚合物基体具有界面极化，从而提高了复合材料的介电常数。绝缘BN具有非常低的电导率，这可以有效地降低复合材料的电导率和介电损耗。与二元聚合物/ Cr AlC / BN复合材料相比，三元聚合物/ Cr AlC / BN复合材料可实现低介电损耗和低电导率以及适当降低的介电常数。填充有10 wt％的Cr ₂ AlC和2 wt％的BN的三元复合材料的介电常数约为30，介电损耗约为0.7，电导率约为4.6×10 ^-7 S m ^-1在100 Hz 在这项工作中，通过导电和绝缘陶瓷填料之间的良好配合，制备了高性能复合电介质，这可能为有前途的储能电容器设计提供一个思路。