BiFeO₃ (BFO) with excellent intrinsic polarization (P_s > 100 μC/cm²) receives a great deal of attention for advanced lead-free ferroelectric materials. However, the low resistance and high leakage current density in its naturally seriously hinder the improvement of energy storage performances. Herein, we demonstrate that superb comprehensive performances of large discharged energy density (W_rec ∼ 6 J/cm³) along with superior discharged efficiency (η ∼ 90%), impressive frequency stability (1–500 Hz), fatigue resistance testing (1-10⁵ cycles) and ultrafast discharged time (t_0.9–0.08 μs) could be attained in 0.3BiFeO₃-0.7(0.88BaTiO₃-0.12Bi(Li_1/3Hf_2/3)O₃ [BFO-(BT-BLH)] relaxor ferroelectric ceramics. Remarkably improved breakdown strength (E_b) of BFO-based solid solutions could be primarily contributed to the substitution of BT-BLH, which provides refined grain sizes, as well as increased bandgap, resistivity, and activation energy. The phase-field simulations further indicate that the refined grain sizes are beneficial to improving local electric field distribution and breakdown path, resulting in enhanced E_b. The uncovered BFO-based ceramics design method provides a platform for high-performance capacitors development for extreme conditions.

BiFeO ₃ (BFO) 具有优异的本征极化 ( P _s  > 100 μC/cm ² )，在先进的无铅铁电材料中受到广泛关注。然而，其低电阻和高漏电流密度自然严重阻碍了储能性能的提高。在这里，我们证明了大放电能量密度（W _rec  ∼ 6 J/cm ³）以及卓越的放电效率（η  ∼ 90%）、令人印象深刻的频率稳定性（1-500 Hz）、抗疲劳测试（1 -10 ⁵个周期）和超快放电时间（t _{0.9在0.3BiFeO 3} -0.7(0.88BaTiO ₃ -0.12Bi(Li _1/3 Hf _2/3 )O ₃ [BFO-(BT-BLH)]弛豫铁电陶瓷中可以达到–0.08 μs 。显着提高击穿强度( E _b ) BFO 基固溶体的主要贡献是替代 BT-BLH，它提供了细化的晶粒尺寸，以及增加的带隙、电阻率和活化能。相场模拟进一步表明，细化晶粒尺寸有利于改善局部电场分布和击穿路径，从而提高E _b. 未发现的基于 BFO 的陶瓷设计方法为极端条件下的高性能电容器开发提供了一个平台。