Lead‐free dielectric ceramics have been the spotlight in the search for environmentally benign materials for electrostatic energy storage because of the ever‐increasing environmental concerns. However, the inverse correlation between the polarization and dielectric breakdown strength is the major barrier hindering the provision of sufficient energy densities in lead‐free dielectric ceramics and practical applications thereof. Herein, a rational structure design inspired by nature is demonstrated as an effective strategy to overcome these challenges. Bioinspired raspberry‐like hierarchically structured all‐inorganic nanocomposites have been prepared by enclosing microsized BaTiO₃‐Bi(Mg_0.5Zr_0.5)O₃ (BT‐BMZ) relaxor ferroelectrics using core‐shell BT‐BMZ@SiO₂ nanoparticles. The synergistic effects of the bioinspired hierarchical structure and insulating SiO₂ nano‐coating result in significantly improved dielectric breakdown strength and sustained large polarization in the nanocomposites, as corroborated by experimental characterizations and theoretical simulations. As a result, an ultrahigh energy density of 3.41 J cm⁻³ and a high efficiency of 85.1%, together with outstanding thermal stability within a broad temperature range, have been simultaneously achieved in the hierarchically structured nanocomposites. This contribution provides a feasible and paradigmatic approach to develop high‐performance dielectrics for electrostatic energy storage applications using bioinspired structure design.

中文翻译：

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具有生物启发性的分层结构全无机纳米复合材料，电容性能显着提高

由于对环境的关注日益增加，无铅介电陶瓷已成为寻找对环境有益的静电能量存储材料的关注点。但是，极化和介电击穿强度之间的逆相关性是阻碍无铅介电陶瓷及其实际应用中提供足够能量密度的主要障碍。在本文中，受自然启发的合理结构设计被证明是克服这些挑战的有效策略。通过封闭微细的BaTiO ₃ -Bi（Mg _0.5 Zr _0.5）O ₃制备了具有生物启发性的树莓状层次结构的全无机纳米复合材料（BT-BMZ）弛豫铁电体，使用核-壳BT-BMZ @ SiO ₂纳米粒子。由实验启发和理论模拟证实，生物启发的层级结构和绝缘的SiO ₂纳米涂层的协同作用可显着提高纳米复合材料的介电击穿强度并保持大极化。结果是3.41 J cm ^-3的超高能量密度在分层结构的纳米复合材料中，同时实现了85.1％的高效率以及在宽温度范围内的出色热稳定性。这一贡献为采用生物启发性结构设计为静电能存储应用开发高性能电介质提供了一种可行的范例方法。