NaNbO₃-based lead-free energy-storage ceramics have been extensively investigated owing to their large bandgap and antiferroelectric characteristics, which are important candidates for next-generation pulse power capacitors. However, the low energy-storage efficiency caused by antiferroelectric-ferroelectric phase transition strongly restricts their development. To overcome this phase transition characteristic, here, Ba(Fe_0.5Nb_0.5)O₃ is considered to be introduced into NaNbO₃ ceramic as a ferroelectric stabilizer, relaxation agent, and sintering aid with multiple roles, leading to the synergistic effect of substantially weakened antiferroelectricity, established ergodic relaxor, destroyed long-range ordered polarization, decreased grain size and delayed polarization saturation. As a result, a high W_rec of ∼3.55 J/cm³ and a large η of ∼84.1% accompanied by an ultrafast discharge rate of ∼30 ns are simultaneously realized in 0.82NaNbO₃-0.18Ba(Fe_0.5Nb_0.5)O₃ relaxor ferroelectric ceramic. This work demonstrates that multi-role regulation is an effective strategy for designing new lead-free dielectric ceramics with excellent energy-storage performance.

NaNbO ₃基无铅储能陶瓷因其大带隙和反铁电特性而受到广泛研究，是下一代脉冲功率电容器的重要候选者。然而，反铁电-铁电相变导致的低储能效率严重限制了它们的发展。为了克服这种相变特性，这里考虑将Ba(Fe _0.5 Nb _0.5 )O ₃引入到NaNbO _3中陶瓷作为铁电稳定剂、弛豫剂和烧结助剂等多重作用，导致反铁电性大幅减弱、建立遍历弛豫、破坏长程有序极化、减小晶粒尺寸和延迟极化饱和的协同效应。结果，在0.82NaNbO _{3 -0.18Ba} (Fe _0.5 Nb _0.5 )O中同时实现了~3.55 J/cm ^3的高Wrec和~84.1%的大η以及~30 ns的超快放电速率。 ₃弛豫铁电陶瓷。这项工作表明，多角色调节是设计具有优异储能性能的新型无铅介电陶瓷的有效策略。