Dielectric capacitors with high energy storage performances are exceedingly desired for the next-generation advanced high/pulsed power devices that demand miniaturization and integration. However, poor energy-storage density (Urec) and low efficiency (η) resulted from the large remanent polarization (Pr) and low breakdown strength (BDS), have been the major challenge for the application of dielectric capacitors. Herein, a high-entropy strategy with superparaelectric relaxor ferroelectrics (SP-RFE) was adopted to achieve extremely low Pr and high BDS in BaTiO3 system, simultaneously. Due to the high BDS ∼800 kV/cm and low Pr∼0.58 μC/cm2, high-entropy SP-RFE (La0.05Ba0.18Sr0.18K0.115Na0.115Ca0.18Bi0.18)TiO3 (LBSKNCBT) MLCCs exhibited high Urec ∼6.63 J/cm3 and excellent η ∼ 96%. What's more, LBSKNCBT MLCCs with high-entropy and SP-RFE characteristic also possess a good temperature and frequency stability. In a word, this work offers an excellent paradigm for achieving good energy-storage properties of BaTiO3-based dielectric capacitors to meet the demanding requirements of advanced energy storage applications.

中文翻译：

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通过协同高熵和超顺电弛豫策略为 BaTiO3 基多层电容器实现出色的储能性能


具有高储能性能的介电电容器是需要小型化和集成的下一代先进高/脉冲功率器件的极大需求。然而，由于剩余极化 （Pr） 大和击穿强度 （BDS） 低而导致的低储能密度 （Urec） 和低效率 （η） 一直是介电电容器应用的主要挑战。本文采用超顺电弛豫铁电体 （SP-RFE） 的高熵策略，在 BaTiO3 体系中同时实现了极低的 Pr 和高 BDS。由于高 BDS ∼800 kV/cm 和低 Pr∼0.58 μC/cm2，高熵 SP-RFE （La0.05Ba0.18Sr0.18K0.115Na0.115Ca0.18Bi0.18）TiO3 （LBSKNCBT） MLCC 表现出高尿素 ∼6.63 J/cm3 和优异的 η ∼ 96%。此外，具有高熵和 SP-RFE 特性的 LBSKNCBT MLCC 还具有良好的温度和频率稳定性。总之，这项工作为实现基于 BaTiO3 的介电电容器的良好储能性能提供了一个很好的范例，以满足高级储能应用的苛刻要求。