BiFeO₃-BaTiO₃-based relaxor ferroelectric ceramic has attracted increasing attention for energy storage applications. However, simultaneously achieving high recoverable energy storage density (W_rec) and efficiency (η) under low electric field has been a longstanding drawback for their practical applications. Herein, a novel relaxor ferroelectric material was designed by introducing (Sr_0.7Bi_0.2)TiO₃ (SBT) into the composition 0.67BiFeO₃-0.33BaTiO₃ (BF-BT-xSBT). A large W_rec of ∼2.40 J/cm³ and a high η of ∼90.4 % were simultaneously realized under a low electric field of 180 kV/cm, which is superior to that of most previously reported lead-free ceramics. Moreover, moderate temperature endurance and excellent frequency stability were also obtained. More importantly, this ceramic has a large discharge current density (∼289.18 A/cm²), a discharge power density (∼14.46 MW/cm³) and short discharge time (<0.25 μs). These results not only demonstrate superior potential in BF-BT-SBT ceramics, but also offer a new design to tune the energy storage performance of lead-free relaxor ferroelectric ceramics.

的BiFeO ₃ -BaTiO ₃系弛豫铁电陶瓷已经吸引了越来越多的能源存储应用的关注。然而，在低电场下同时实现高可回收能量存储密度（W _rec）和效率（η）对于它们的实际应用一直是一个长期的缺点。在此，通过将（Sr _0.7 Bi _0.2）TiO ₃（SBT）引入到组成0.67BiFeO ₃ -0.33BaTiO ₃（BF-BT- x SBT）中来设计新颖的弛豫铁电材料。大W _rec约为2.40 J / cm ³，高在180 kV / cm的低电场下同时实现了约90.4％的η，这优于先前报道的大多数无铅陶瓷。此外，还获得了中等的温度耐受性和优异的频率稳定性。更重要的是，该陶瓷具有大的放电电流密度（〜289.18A / cm ²），放电功率密度（〜14.46MW / cm ³）和短的放电时间（＜0.25μs ）。这些结果不仅证明了其在BF-BT-SBT陶瓷中的巨大潜力，而且还提供了一种新设计来调整无铅松弛铁电陶瓷的储能性能。