Flexible dielectric materials have given rise to extensive attention in power electronics and other fields because of their outstanding superiorities such as high-power density. However, how to effectively heighten the energy storage density of the dielectric is a long-term challenge. The single fillers introduced tends to focus on enhancing the insulating or polarized properties of the composite, which limits further improvements in energy storage density. In this paper, through the co-doped of insulating boron nitride (BNNS) and polarized titanium dioxide (TiO₂) two-dimensional nanosheets, the polarization strength is enhanced, and the breakdown strength can maintain at a high level, then an excellent energy storage density of 20.08J/cm³ and charge–discharge efficiency of 73 % are obtained. Meanwhile, the co-doped composite has great stability and an ultrahigh power density close to 5 times of BOPP. This study offers a guidance for the reasonable design of P(VDF-TrFE-CFE) polymer composite with excellent electric storage properties.

柔性介质材料以其高功率密度等突出优势在电力电子等领域引起了广泛关注。然而，如何有效提高电介质的储能密度是一个长期的挑战。引入的单一填料往往侧重于增强复合材料的绝缘或极化性能，这限制了储能密度的进一步提高。本文通过共掺杂绝缘氮化硼（BNNS）和极化二氧化钛（TiO ₂）二维纳米片，增强了极化强度，同时击穿强度可以保持在较高水平，从而获得优异的能量20.08J/cm ^{3的存储密度}获得了 73% 的充放电效率。同时，共掺杂复合材料稳定性好，具有接近BOPP 5倍的超高功率密度。该研究为合理设计具有优异蓄电性能的P(VDF-TrFE-CFE)聚合物复合材料提供了指导。