Chen Liang, Wang Na, Zhang Zhifei, Yu Huifen, Wu Jie, Deng Shiqing, Liu Hui, Qi He, Chen Jun
Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
Adv Mater. 2022 Nov;34(44):e2205787. doi: 10.1002/adma.202205787. Epub 2022 Oct 3.
Lead-free dielectric ceramics with ultrahigh energy-storage performance are the core components used in next-generation advanced pulse power capacitors. However, the low energy storage density largely hinders their development towards miniaturization, lightweight, and integration. Here, an effective strategy of constructing local diverse polarization is designed in superparaelectrics to realize an ultrahigh energy storage density of ≈10.59 J cm as well as a large efficiency of ≈87.6%. The excellent comprehensive energy-storage performance is mainly attributed to the design of ultrasmall polar nanoregions with local diverse polarization configuration, confirmed by scanning transmission electron microscopy, leading to the reduced heat loss, substantially enhanced polarization, and breakdown electric field compared to ceramics with single polarization configuration. Benefiting from these features, outstanding temperature/frequency/cycling stability and superior charge/discharge performance (power density ≈187.5 MW cm , discharge energy density ≈3.52 J cm , discharge rate ≈77 ns) are also achieved. This work demonstrates that local diverse polarization is a super strategy to design new dielectric materials with high energy-storage performance.
具有超高储能性能的无铅介电陶瓷是下一代先进脉冲功率电容器的核心部件。然而，低储能密度在很大程度上阻碍了它们向小型化、轻量化和集成化方向发展。在此，在超顺电体中设计了一种构建局部多样极化的有效策略，以实现≈10.59 J/cm³的超高储能密度以及≈87.6%的高储能效率。优异的综合储能性能主要归因于具有局部多样极化构型的超小极性纳米区域的设计，扫描透射电子显微镜证实了这一点，与具有单一极化构型的陶瓷相比，这导致了热损失降低、极化大幅增强以及击穿电场提高。受益于这些特性，还实现了出色的温度/频率/循环稳定性和卓越的充放电性能（功率密度≈187.5 MW/cm³，放电能量密度≈3.52 J/cm³，放电速率≈77 ns）。这项工作表明，局部多样极化是设计具有高储能性能的新型介电材料的超级策略。
