Hexagonal boron nitride nanosheets (BNNSs) are two-dimensional nanomaterials with graphitic-like layered nanostructures, high surface areas, and large aspect ratios. Owing to their excellent thermal conductivity, electrical and mechanical strengths, BNNSs are emerging as multifunctional fillers in polymer dielectrics. In this article, the authors review the recent progress in the BN-containing polymer nanocomposites designed for high-performance film capacitors. While general synthetic approaches to BNNSs and polymer/BNNS nanocomposites are summarized, particular attention is placed on structure-property correlation and rational structural design of the composites with optimized dielectric properties and capacitive performances. In stark contrast to the polymer composites employing high dielectric constant fillers to enhance the electric displacement, a new design concept based on the utilization of BNNSs with a wide bandgap to impede electrical conduction and consequently improve breakdown strength and charge-discharge efficiency of the polymer composites, is highlighted. The significance of developing dielectric capacitors with desirable thermal conductivity and thermal stability to ensure their robust and efficient operation is emphasized. The merits and challenges regarding the existing polymer dielectrics containing BNNSs for energy storage are identified. An outlook for future research opportunities and engineering applications is also presented in this review.

六方氮化硼纳米片（BNNS）是二维纳米材料，具有类似石墨的层状纳米结构，高表面积和大长宽比。由于其出色的导热性，电气和机械强度，BNNS逐渐成为聚合物电介质中的多功能填料。在本文中，作者回顾了设计用于高性能薄膜电容器的含BN聚合物纳米复合材料的最新进展。虽然总结了BNNS和聚合物/ BNNS纳米复合材料的一般合成方法，但要特别注意具有最佳介电性能和电容性能的复合材料的结构性能相关性和合理的结构设计。与采用高介电常数填料来增强电位移的聚合物复合材料形成鲜明对比的是，基于利用具有宽禁带宽度的BNNS来阻止导电的新设计理念，从而提高了聚合物复合材料的击穿强度和充放电效率，突出显示。强调了开发具有理想导热率和热稳定性的介电电容器以确保其鲁棒和有效运行的重要性。确定了有关现有的含BNNS的聚合物电介质用于能量存储的优缺点。这篇综述还对未来的研究机会和工程应用进行了展望。着重提出了一种新的设计概念，该概念基于利用具有宽禁带的BNNS来阻止导电，从而提高聚合物复合材料的击穿强度和充放电效率。强调了开发具有理想导热率和热稳定性的介电电容器以确保其鲁棒和有效运行的重要性。确定了有关现有的含BNNS的聚合物电介质用于能量存储的优缺点。这篇综述还介绍了未来的研究机会和工程应用前景。着重提出了一种新的设计思想，该思想基于利用具有宽禁带的BNNS来阻止导电并因此提高聚合物复合材料的击穿强度和充放电效率。强调了开发具有理想导热率和热稳定性的介电电容器以确保其鲁棒和有效运行的重要性。确定了有关现有的含BNNS的聚合物电介质用于能量存储的优缺点。这篇综述还对未来的研究机会和工程应用进行了展望。强调了开发具有理想导热率和热稳定性的介电电容器以确保其鲁棒和有效运行的重要性。确定了有关现有的含BNNS的聚合物电介质用于能量存储的优缺点。这篇综述还介绍了未来的研究机会和工程应用前景。强调了开发具有理想导热率和热稳定性的介电电容器以确保其鲁棒和有效运行的重要性。确定了有关现有的含BNNS的聚合物电介质用于能量存储的优缺点。这篇综述还介绍了未来的研究机会和工程应用前景。