Chen Liang, Deng Shiqing, Liu Hui, Wu Jie, Qi He, Chen Jun
Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, 100083, Beijing, China.
Department of Physical Chemistry, University of Science and Technology Beijing, 100083, Beijing, China.
Nat Commun. 2022 Jun 2;13(1):3089. doi: 10.1038/s41467-022-30821-7.
Next-generation advanced high/pulsed power capacitors rely heavily on dielectric ceramics with high energy storage performance. However, thus far, the huge challenge of realizing ultrahigh recoverable energy storage density (W) accompanied by ultrahigh efficiency (η) still existed and has become a key bottleneck restricting the development of dielectric materials in cutting-edge energy storage applications. Here, we propose a high-entropy strategy to design "local polymorphic distortion" including rhombohedral-orthorhombic-tetragonal-cubic multiphase nanoclusters and random oxygen octahedral tilt, resulting in ultrasmall polar nanoregions, an enhanced breakdown electric field, and delayed polarization saturation. A giant W ~10.06 J cm is realized in lead-free relaxor ferroelectrics, especially with an ultrahigh η ~90.8%, showing breakthrough progress in the comprehensive energy storage performance for lead-free bulk ceramics. This work opens up an effective avenue to design dielectric materials with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.
下一代先进的高/脉冲功率电容器严重依赖于具有高储能性能的介电陶瓷。然而，迄今为止，实现伴随超高效率（η）的超高可恢复储能密度（W）这一巨大挑战仍然存在，并且已成为限制前沿储能应用中介电材料发展的关键瓶颈。在此，我们提出一种高熵策略来设计“局部多晶型畸变”，包括菱方-正交-四方-立方多相纳米团簇和随机氧八面体倾斜，从而产生超小的极性纳米区域、增强的击穿电场和延迟的极化饱和。在无铅弛豫铁电体中实现了巨大的W10.06 J/cm³，尤其是具有超高的η90.8%，这在无铅块状陶瓷的综合储能性能方面显示出突破性进展。这项工作为设计具有超高综合储能性能的介电材料开辟了一条有效途径，以满足先进储能应用的苛刻要求。
