Electrostatic dielectric capacitors are essential components in advanced electronic and electrical power systems due to their ultrafast charging/discharging speed and high power density. A major challenge, however, is how to improve their energy densities to effectuate the next-generation applications that demand miniaturization and integration. Here, we report a high-entropy stabilized Bi₂Ti₂O₇-based dielectric film that exhibits an energy density as high as 182 J cm⁻³ with an efficiency of 78% at an electric field of 6.35 MV cm⁻¹. Our results reveal that regulating the atomic configurational entropy introduces favourable and stable microstructural features, including lattice distorted nano-crystalline grains and a disordered amorphous-like phase, which enhances the breakdown strength and reduces the polarization switching hysteresis, thus synergistically contributing to the energy storage performance. This high-entropy approach is expected to be widely applicable for the development of high-performance dielectrics.

静电介电电容器因其超快的充电/放电速度和高功率密度而成为先进电子和电力系统中必不可少的组件。然而，一个主要挑战是如何提高它们的能量密度以实现需要小型化和集成的下一代应用。在这里，我们报道了一种高熵稳定的Bi ₂ Ti ₂ O _{7基介电薄膜，其在6.35 MV cm} ^-1的电场下表现出高达182 J cm ^{-3的能量密度和78% 的效率。}. 我们的结果表明，调节原子构型熵会引入有利且稳定的微观结构特征，包括晶格扭曲的纳米晶粒和无序的类非晶相，从而提高击穿强度并降低极化切换滞后，从而协同促进储能表现。这种高熵方法有望广泛应用于高性能电介质的开发。