Pure polymer film dielectrics with the evident advantage of easy fabrication have been widely used in electronic and electrical systems. But their application is restricted from many high-end fields, such as power electronics and pulsed power devices in which the working temperature is upto 200 °C, where the energy density becomes much lower than that at room temperature. Herein, compact polymer films with a smooth surface are elaborately fabricated through “The King of Plastic” polytetrafluoroethylene (PTFE) nanoparticles by a simple yet effective strategy of heat-treatment. Ultrahigh charge-discharge efficiency (η~94%) and electric breakdown strength (α_b~350 kV/mm) are achieved at a high temperature of 200 °C, which result in a high discharged energy density (U_d~1.08 J/cm³) and a high power density (P_d0.9~0.72 MW/cm³). The state of the art performance of the dielectric and energy storage is attributed to the symmetric molecular structure, compact microstructure and smooth surface of the PTFE films. Importantly, the PTFE films coated with Au electrode perform excellent self-healing ability at high temperatures. The elaborately fabricated PTFE film is thus ideal for high-temperature energy storage application and it also can be used as polymer matrix for holding fillers to acquire even higher performance.

具有易于制造的明显优势的纯聚合物膜电介质已广泛用于电子和电气系统。但是它们的应用受到许多高端领域的限制，例如功率电子设备和脉冲功率设备，它们的工作温度高达200°C，其能量密度远低于室温。在此，通过简单而有效的热处理策略，通过“塑料之王”聚四氟乙烯（PTFE）纳米颗粒精心制作了具有光滑表面的致密聚合物膜。超高充放电效率（η〜94％）和电击穿强度（α _b〜350千伏/毫米）都是在高温下的200℃，这导致高的放电能量密度达到（U _ð〜1.08焦耳/厘米³）和高功率密度（P _d0.9〜0.72 MW / cm ³）。电介质和能量存储的最新技术水平归因于PTFE膜的对称分子结构，致密的微观结构和光滑的表面。重要的是，涂有金电极的PTFE薄膜在高温下具有出色的自修复能力。因此，精心制作的PTFE膜是高温储能应用的理想之选，它还可以用作聚合物基质来保持填料，从而获得更高的性能。