Polymer-based dielectric materials with high power density, high energy density, and broad operating temperature range are critical to the development of cost-efficient and lightweight capacitors for modern high-power electrical systems. Here, NaNbO₃ (NN)/polymer composites, especially two-dimensional (2D) NN platelets, were used to create new composite films for energy storage applications for the first time. The trilayered architecture composites comprised of two outer layers of 2D NN platelets dispersed in a poly(vinylidene fluoride) (PVDF) matrix to provide high dielectric constant and a middle layer of pristine PVDF to offer high breakdown strength. The breakdown strength and energy density of the trilayered architecture composite films were improved significantly via tailoring the contents of the 2D NN platelets. The composite films with an optimized filler content illustrate a high discharge energy density of 13.5 J cm⁻³ at 400 MV m⁻¹, far more than the best commercial biaxially- oriented polypropylenes. Moreover, the composite films show a superior power density of 2.68 MW cm⁻³ and ultra-fast discharge speed of 0.127 μs. Finite element simulation further revealed the breakdown strength and energy density of the composite films were much enhanced compared to the corresponding single layer composite films. Therefore, the new trilayered architecture composite films can be applied as an alternative promising high-performance electrostatic capacitor material.

具有高功率密度，高能量密度和宽工作温度范围的聚合物基介电材料对于开发现代大功率电气系统的经济高效且轻巧的电容器至关重要。在这里，NaNbO ₃（NN）/聚合物复合材料，尤其是二维（2D）NN血小板，首次被用于创建用于能量存储应用的新复合膜。该三层结构复合材料由分散在聚偏二氟乙烯（PVDF）基质中的两个2​​D NN血小板外层组成，可提供高介电常数，而原始PVDF中间层可提供高击穿强度。通过调整2D NN血小板的含量，三层建筑复合膜的击穿强度和能量密度得到了显着改善。具有最佳填料含量的复合薄膜在400 MV m ^-1下显示出13.5 J cm ^-3的高放电能量密度远远超过最好的商用双轴取向聚丙烯。此外，复合膜显示出2.68 MW cm ^-3的优异功率密度和0.127μs的超快放电速度。有限元模拟进一步揭示了与相应的单层复合膜相比，复合膜的击穿强度和能量密度大大提高。因此，新的三层结构复合薄膜可以用作有前途的高性能静电电容器材料。