Flexible organic-based composites embedding nanosheet-like inorganics with high energy storage density (U) are imperatively demanded for applications in portable electronics and sensors. However, the breakdown phases can easily bypass the discontinuous nanosheets, leading to the failure of conduction barriers. Here, continuous flexible Sm-doped BiFeO₃-BaTiO₃ (Sm-BFBT) membranes with superparaelectric characteristics were synthetized via etching a water-soluble Sr₃Al₂O₆ buffer layer. With the single-crystal Sm-BFBT membranes embedded into poly(vinylidene fluoride), a giant U of 46.4 J/cm³ at 770 MV/m is achieved in the sandwich-structured composites, attributed to a formation of depolarized field induced by interfacial ions. Meanwhile, the composites exhibit a stable U of ∼20 J/cm³ at 550 MV/m during bending process, owing to the excellent flexibility of Sm-BFBT membranes originating from nanodomain switching. The proposed composites containing flexible 2D inorganic membranes offer unprecedented structural insights into the integration of high energy storage and stability of bending, and suggest potential uses in flexible energy storage devices.

便携式电子产品和传感器的应用迫切需要嵌入具有高储能密度 ( U )的纳米片状无机物的柔性有机基复合材料。然而，击穿相很容易绕过不连续的纳米片，导致传导势垒失效。在这里，通过蚀刻水溶性 Sr ₃ Al ₂ O ₆缓冲层，合成了具有超顺电特性的连续柔性 Sm 掺杂 BiFeO ₃ -BaTiO _{3 (Sm-BFBT) 膜。}将单晶 Sm-BFBT 膜嵌入聚（偏二氟乙烯），46.4 J/cm ^3的巨大U在夹层结构复合材料中达到 770 MV/m，这归因于界面离子诱导的去极化场的形成。同时，由于源自纳米域转换的 Sm-BFBT 膜具有出色的柔韧性，复合材料在弯曲过程中在 550 MV/m 时表现出稳定的U值约为 20 J/cm ^{3 。}所提出的包含柔性二维无机膜的复合材料为高储能和弯曲稳定性的整合提供了前所未有的结构见解，并提出了在柔性储能设备中的潜在用途。