Chen Liang, Yu Huifen, Wu Jie, Deng Shiqing, Liu Hui, Zhu Lifeng, Qi He, Chen Jun
Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
Nanomicro Lett. 2023 Mar 10;15(1):65. doi: 10.1007/s40820-023-01036-2.
Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market. Here, an ultrahigh energy storage density of ~ 13.8 J cm and a large efficiency of ~ 82.4% are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy, named high-entropy strategy, realizing nearly ten times growth of energy storage density compared with low-entropy material. Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time. The achievement of excellent energy storage properties should be attributed to the enhanced random field, decreased nanodomain size, strong multiple local distortions, and improved breakdown field. Furthermore, the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized. The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics, promoting the development of advanced capacitors .
先进的无铅储能陶瓷在下一代脉冲功率电容器市场中发挥着不可或缺的作用。在此，通过增加组态熵（即高熵策略），在高熵无铅弛豫铁电体中实现了约13.8 J/cm³的超高储能密度和约82.4%的高储能效率，与低熵材料相比，储能密度实现了近十倍的增长。首次系统地揭示了储能性能和畴结构随组态熵增加的演变。优异储能性能的实现应归因于增强的随机场、减小的纳米畴尺寸、强烈的多重局部畸变以及提高的击穿场强。此外，还实现了优异的频率和疲劳稳定性以及具有卓越热稳定性的充放电性能。通过增加组态熵显著增强的综合储能性能表明，高熵是设计新型高性能电介质的一种有效且便捷的策略，推动了先进电容器的发展。
