In this work, Sr_0.7Bi_0.2TiO₃ (SBT) was doped into BF-BT to form a solid solution with relaxor ferroelectric characteristics. Constricted P-E loops were observed due to the field-induced phase transition and a significant reduction of grain size was found in the SBT-doped ceramics. Specially, 15%-SBT doped ceramics (15SBT) possessed the maximum recoverable energy storage (W_rec) of 2.01 J/cm³ and efficiency of 75%. Finite element method was used to analyze the local electrostatic behavior of ceramics under the electric field when the second phase exists. The simulation results indicate that the distributed second phase with moderate fraction has a positive effect on the enhancement of breakdown strength (BDS). More importantly, a viscous polymer process (VPP) route was employed to realize preparation optimization of the above composition. Much denser structure and higher BDS was successfully obtained in the 15SBT ceramic by VPP. The BDS of 15SBT ceramic by VPP has been dramatically increased from 180 to 330 kV/cm, and the W_rec has reached 4.95 J/cm³. Further charge-discharge tests of 15SBT ceramic by VPP also owns a high discharge energy of 2.36 J/cm³. The 15SBT ceramics prepared by VPP can be a potential candidate for high energy storage capacitors. Furthermore, the strategy raised in this study has been proved to be an effective way to achieve excellent energy storage capacity in lead-free ceramics.

在这项工作中，将Sr _0.7 Bi _0.2 TiO ₃（SBT）掺杂到BF-BT中以形成具有弛豫铁电特性的固溶体。由于场诱导的相变，观察到了狭窄的PE回路，并且在掺杂SBT的陶瓷中发现了明显的晶粒尺寸减小。特别地，掺有15％SBT的陶瓷（15SBT）具有2.01 J / cm ³的最大可回收能量存储（W _rec）和效率为75％。当第二相存在时，采用有限元方法分析了电场作用下陶瓷的局部静电行为。仿真结果表明，中等比例分布的第二相对提高击穿强度（BDS）具有积极作用。更重要的是，采用粘性聚合物工艺（VPP）路线来实现上述组合物的制备优化。通过VPP成功地在15SBT陶瓷中获得了更致密的结构和更高的BDS。VPP的15SBT陶瓷的BDS已从180 kV / cm急剧增加到330 kV / cm，W _rec已达到4.95 J / cm ³。VPP对15SBT陶瓷进行的进一步充放电测试还拥有2.36 J / cm的高放电能量³。VPP制备的15SBT陶瓷可能是高能量存储电容器的潜在候选者。此外，已证明该研究中提出的策略是在无铅陶瓷中实现出色储能能力的有效方法。