Lead-free antiferroelectric ceramics with high energy storage performance show great potential in pulsed power capacitors. However, poor breakdown strength and antiferroelectric stability are the two main drawbacks that limit the energy storage performance of antiferroelectric ceramics. Herein, high-quality (Ag_1-xNa_x)(Nb_1-xTa_x)O₃ ceramics were prepared by the tape casting process. The breakdown strength was greatly improved as a result of the high density and fine grains, while the antiferroelectric stability was enhanced owning to the M₂ phase. Benefiting from the synergistic improvement in breakdown strength and antiferroelectric stability, (Ag_0.80Na_0.20)(Nb_0.80Ta_0.20)O₃ ceramic reveals a benign energy storage performance of W_rec = 5.8 J/cm³ and η = 61.7% with good temperature stability, frequency stability and cycling reliability. It is also found that the high applied electric field can promote the M₂-M₃ phase transition, which may provide ideas to improve the thermal stability of the energy storage performance in AgNbO₃-based ceramics.

具有高储能性能的无铅反铁电陶瓷在脉冲功率电容器中显示出巨大的潜力。然而，较差的击穿强度和反铁电稳定性是限制反铁电陶瓷储能性能的两个主要缺点。在此，通过流延工艺制备了高质量的(Ag _{1- x} Na _x )(Nb _{1- x} Ta _x )O _3陶瓷。高密度和细晶粒大大提高了击穿强度，而M ₂相提高了反铁电稳定性。受益于击穿强度和反铁电稳定性的协同提高，（Ag_0.80 Na _0.20 )(Nb _0.80 Ta _0.20 )O _{3陶瓷表现出}W _rec  = 5.8 J/cm ³和η = 61.7%的良性储能性能， 具有良好的温度稳定性、频率稳定性和循环可靠性。还发现高外加电场可以促进M ₂ -M _{3相变，这可能为提高AgNbO 3}基陶瓷储能性能的热稳定性提供思路。