Dielectric capacitors offer high-power density and ultrafast discharging times as compared to electrochemical capacitors and batteries, making them potential candidates for pulsed power technologies (PPT). However, low energy density in different dielectric materials such as linear dielectrics (LDs), ferroelectrics (FEs), and anti-ferroelectric (AFEs) owing to their low polarization, large hysteresis loss and low breakdown strength, respectively, limits their real time applications. Thus, achieving a material with high dielectric constant, large dielectric breakdown strength and slim hysteresis is imperative to obtain superior energy performance. In this context, relaxor ferroelectrics (RFEs) emerged as the most promising solution for energy storage capacitors. This review starts with a brief introduction of different energy storage devices and current advances of dielectric capacitors in PPT. The latest developments on lead-free RFEs including bismuth alkali titanate based, barium titanate based, alkaline niobite based perovskites both in ceramics and thin films are comprehensively discussed. Further, we highlight the different strategies used to enhance their energy storage performance to meet the requirements of the energy storage world. We also provide future guidelines in this field and therefore, this article opens a window for the current advancement in the energy storage properties of RFEs in a systematic way.

与电化学电容器和电池相比，介电电容器具有高功率密度和超快放电时间，使其成为脉冲功率技术 (PPT) 的潜在候选者。然而，线性电介质 (LD)、铁电体 (FE) 和反铁电体 (AFE) 等不同电介质材料的低能量密度分别由于其低极化、大磁滞损耗和低击穿强度而限制了它们的实时应用. 因此，获得具有高介电常数、大介电击穿强度和小滞后的材料对于获得卓越的能量性能势在必行。在这种情况下，弛豫铁电体 (RFE) 成为最有前途的储能电容器解决方案。本综述首先在 PPT 中简要介绍了不同的储能器件和介质电容器的当前进展。全面讨论了陶瓷和薄膜中碱金属钛酸铋基、钛酸钡基、碱性铌矿基钙钛矿等无铅 RFE 的最新进展。此外，我们强调了用于提高其储能性能以满足储能领域要求的不同策略。我们还提供了该领域的未来指南，因此，本文以系统的方式为 RFE 储能特性的当前进展打开了一扇窗。全面讨论了陶瓷和薄膜中的碱性铌矿基钙钛矿。此外，我们强调了用于提高其储能性能以满足储能领域要求的不同策略。我们还提供了该领域的未来指南，因此，本文以系统的方式为 RFE 储能特性的当前进展打开了一扇窗。全面讨论了陶瓷和薄膜中的碱性铌矿基钙钛矿。此外，我们强调了用于提高其储能性能以满足储能领域要求的不同策略。我们还提供了该领域的未来指南，因此，本文以系统的方式为 RFE 储能特性的当前进展打开了一扇窗。