The rapidly advancing energy storage performance of dielectric ceramics capacitors have garnered significant interest for applications in fast charge/discharge and high-power electronic techniques. Simultaneously improving the recoverable energy storage density Wrec and efficiency η becomes more prominent at the present time for their practical applications. Herein, a high-entropy concept is implemented on the (K0·5Na0.5)NbO3 (KNN)-based ferroelectric ceramics to design the high-performance dielectric capacitors. First, the strong lattice distortion can absorb some electric energy during the electrical loading process and result in the delayed polarization saturation. Additionally, the large composition fluctuations induce the weak correlation between polar nanoregions and enhance the η. Finally, the high-entropy design and viscous polymer processing method reduce the grain size and improve the Eb. In consequence, excellent Wrec of 11.14 J/cm3 with high η of 87.1% are achieved under an electric field of 750 kV/cm in the high-entropy component. These results demonstrate that the high-entropy concept is a potential avenue to design the KNN-based high-performance dielectric energy storage capacitors.

中文翻译：

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通过高熵设计，在 KNN 基铁电陶瓷中实现卓越的储能密度和超高效率


介电陶瓷电容器的快速发展储能性能在快速充电/放电和大功率电子技术中的应用引起了极大的兴趣。同时提高可回收储能密度 Wrec 和效率 η 在当前其实际应用中变得更加突出。在此，在 （K0·5Na0.5）NbO3 （KNN） 基铁电陶瓷上实现了高熵概念，以设计高性能介电电容器。首先，强晶格畸变在电加载过程中会吸收一些电能，导致延迟极化饱和。此外，较大的成分波动诱导了极性纳米区域之间的弱相关性并增强了η。最后，高熵设计和粘性聚合物加工方法减小了晶粒尺寸，提高了 Eb。因此，在高熵分量中，在 750 kV/cm 的电场下实现了 11.14 J/cm3 的优异 Wrec 和 87.1% 的高η。这些结果表明，高熵概念是设计基于 KNN 的高性能介电储能电容器的潜在途径。