Lead-free (0.70-x)BiFeO₃-0.30BaTiO₃-xAgNbO₃+5‰mol CuO (abbreviated as BF-BT-xAN) ceramics were fabricated using a modified thermal quenching technique. BF-BT-xAN ceramics are of a perovskite structure with morphotropic phase boundary (MPB) and show strong relaxor properties. Remarkably, the high recoverable energy storage density of 2.11 J/cm³ is obtained for BF-BT-xAN with x = 0.14. For the x = 0.14 ceramics, its energy storage efficiency is as high as 84 % at relative low field of 195 kV/cm, together with an outstanding thermal stability in a broad temperature range from 25 °C to 150 °C. In addition, this ceramic maintains superior energy storage performance even after 8 × 10⁴ electrical cycles due to its high densification after doping Ag₂O and Nb₂O₅. The result suggests that lead-free BF-BT-xAN ceramics may be promising candidate for dielectric energy storage application.

无铅（0.70- X）的BiFeO ₃ -0.30BaTiO ₃ - X AgNbO ₃ + 5‰摩尔的CuO（简称为BF-BT- X AN）使用改良的热淬火技术陶瓷的制造。BF-BT- x AN陶瓷为钙钛矿结构，具有相变相边界（MPB），并具有很强的弛豫性能。值得注意的是，BF-BT- x AN的x可得到2.11 J / cm ³的高可回收能量存储密度。 = 0.14。对于x = 0.14的陶瓷，在195 kV / cm的相对低电场下，其储能效率高达84％，在25°C至150°C的宽温度范围内均具有出色的热稳定性。另外，由于在掺杂Ag ₂ O和Nb ₂ O ₅之后具有高致密性，该陶瓷甚至在8×10 ⁴电循环后仍保持优异的能量存储性能。结果表明，无铅BF-BT- x AN陶瓷有望成为介电储能应用的有希望的候选者。