With a view to the rapid development of pulsed power capacitors, the demands for higher energy density, energy efficiency, and stability have increased significantly. A large amount of research has been devoted to the energy storage field of dielectric ceramics, however, scientific and effective strategy to design novel materials with excellent energy storage performance is still lacking. In this work, a new guideline was proposed that higher energy density and efficiency are easier obtained in crossover relaxor ferroelectrics, which is between normal ferroelectrics and relaxor ferroelectrics. Based on this theory, a series of lead-free (1-x)(0.65BaTiO₃-0.35Bi_0.5Na_0.5TiO₃)-xSr(Sc_0.5Nb_0.5)O₃ ((1-x)BBNT-xSSN, x=0, 0.05, 0.10, 0.15, 0.20) ceramics are designed and investigated. Optimal energy storage properties are achieved in 0.9BBNT-0.1SSN ceramic, with a large W_rec of 2.02 J/cm³ and a high η of 90.18% under a moderate electric field of 206 kV/cm. More importantly, both the W_rec and η of 0.9BBNT-0.1SSN ceramic show outstanding stability (including frequency, thermal, and cycle life stability) at 150 kV/cm, which is superior to other lead-free ceramics. These results demonstrate 0.9BBNT-0.1SSN ceramic is a promising candidate for practical energy storage applications.

为了快速发展脉冲式功率电容器，对更高的能量密度，能量效率和稳定性的需求已显着增加。介电陶瓷的储能领域已经进行了大量的研究，但是，仍然缺乏科学有效的策略来设计具有优异储能性能的新型材料。在这项工作中，提出了一条新的指导方针，即在普通弛豫铁电体与弛豫铁电体之间的跨接弛豫铁电体中更容易获得更高的能量密度和效率。基于这一理论，一系列无铅（1- x）（0.65BaTiO ₃ -0.35Bi _0.5 Na _0.5 TiO ₃）-x Sr（Sc设计并研究了_0.5 Nb _0.5）O ₃（（1- x）BBNT- x SSN，x = 0，0.05，0.10，0.15，0.20 ）陶瓷。在0.9BBNT-0.1SSN陶瓷中实现了最佳的储能性能，在206 kV / cm的中等电场下，W _rec为2.02 J / cm ³，η为90.18％。更重要的是，W _rec和η0.9BBNT-0.1SSN陶瓷在150 kV / cm时表现出出色的稳定性（包括频率，热和循环寿命稳定性），优于其他无铅陶瓷。这些结果表明0.9BBNT-0.1SSN陶瓷是实际储能应用的有希望的候选者。