Polymer dielectrics possess the advantages of excellent mechanical properties, high dielectric breakdown strength and good processability, their dielectric properties at elevated temperatures for energy storage need substantial improvement. Polymer nanocomposites have been configurated by integrating the merits of both polymers and ceramics to improve dielectric properties for high-temperature applications, such as hybrid electric vehicles, oil and gas exploration, and aerospace industry. This review presents the current advances of polymer nanocomposites used as dielectric materials for energy storage at high temperatures. Subsequently, the main factors in terms of attaining high-temperature application dielectrics are emphasized, as well as theoretical simulation work of polymer composite dielectrics at elevated temperatures. This work also discusses how nanofiller affects energy density while embedded in the polymer matrix at high temperatures. Finally, the types of dielectrics, as well as the advantages, progress, shortcomings, and limitations of dielectric materials under broad temperatures are summarized in this review.

聚合物电介质具有优异的机械性能，高的电介质击穿强度和良好的可加工性的优点，它们在高温下用于储能的介电性能需要大大改善。通过整合聚合物和陶瓷的优点来配置聚合物纳米复合材料，以改善高温应用的介电性能，例如混合动力电动汽车，石油和天然气勘探以及航空航天工业。这篇综述介绍了聚合物纳米复合材料在高温下作为储能材料的最新进展。随后，重点强调了获得高温应用电介质的主要因素，以及在高温下聚合物复合电介质的理论模拟工作。这项工作还讨论了纳米填料在高温下嵌入聚合物基体时如何影响能量密度。最后，本文总结了电介质的类型，以及在宽温度下电介质材料的优点，进展，缺点和局限性。