Advancements in pulsed electronic power systems depend significantly on high‐performance dielectric energy storage ceramics. Lead‐free NaNbO3‐based energy‐storage ceramics are important materials for next‐generation pulsed power capacitors owing to their large polarization and bandgaps. However, the high energy loss caused by the antiferroelectric‐ferroelectric phase transition leads to low recoverable energy storage density and efficiency, which hinders its practical application. Herein, a weakly coupled relaxor ferroelectric is designed via chemical modification, which realises a high recoverable density of 12.7 J cm−3 and a decent η of 85.7%. Compositionally induced domain‐size refinement effectively delays low‐field polarization saturation and elevates η. Experimental characterization and theoretical‐model analysis confirm that the superior comprehensive energy‐storage performance is attributed to the component‐driven formation of polar nano‐micro‐regions with weak interactions, which suppresses the polarization hysteresis and improves the polarization difference. This study demonstrates that component‐driven construction of weakly coupled relaxor ferroelectric materials is an effective strategy for achieving ultrahigh energy‐storage characteristics.

中文翻译：

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通过弱耦合弛豫行为协同增强基于 NaNbO3 的无铅弛豫铁电体的储能性能


脉冲电子电源系统的进步在很大程度上依赖于高性能介电储能陶瓷。无铅 NaNbO3 基储能陶瓷具有较大的极化和带隙，是下一代脉冲电力电容器的重要材料。然而，反铁电-铁电相变引起的高能量损失导致可恢复储能密度和效率低，阻碍了其实际应用。在此，通过化学改性设计了一种弱耦合弛豫铁电体，实现了 12.7 J cm-3 的高可恢复密度和 85.7% 的良好η。成分诱导的域大小细化有效地延迟了低场极化饱和并提高了η。实验表征和理论模型分析证实，优异的综合储能性能归因于成分驱动形成具有弱相互作用的极性纳米微区，从而抑制了极化滞后并改善了极化差异。这项研究表明，弱耦合弛豫铁电材料的元件驱动构建是实现超高储能特性的有效策略。