Chen Xiqi, Pan Zhongbin, Zhang Yong, Li Huanhuan, Zhao Jinghao, Tang Luomeng, Liu Jinjun, Li Peng, Zhai Jiwei
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.
Ningbo institute of Technology, Beihang University, Ningbo, Zhejiang 315211, China.
ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40735-40743. doi: 10.1021/acsami.3c07323. Epub 2023 Aug 17.
Electrostatic capacitors based on dielectric materials are essential for enabling technological advances, including miniaturization and integration of electronic devices. However, maintaining a high polarization and breakdown field strength simultaneously in electrostatic capacitors remains a major challenge for industrial applications. Herein, a universal approach to delaying saturation polarization in BaTiO-based ceramic is reported via tailoring phase fraction to improve capacitive performance. The ceramic of 0.85(0.7BaTiO-0.3BiNaTiO)-0.15BiLi(TiTa)O delivers an ultrahigh recoverable energy density () of 7.16 J cm along with an efficiency (η) of approximately 90% at a breakdown electric field of 700 kV cm, outperforming the current BaTiO-based ceramics and other lead-free ceramics. Meanwhile, the and η exhibit wide frequency, temperature, and cycling fatigue stability. Additionally, both an extremely fast discharge time of 115 ns and a large power density of 106.16 MW cm are concurrently attained. This work offers a promising pathway for delaying saturation polarization design in order to create scalable high-energy-density ceramics capacitors and highlight the research prospects of pulse power applications.
基于介电材料的静电电容器对于推动技术进步至关重要，包括电子设备的小型化和集成化。然而，在静电电容器中同时保持高极化和击穿场强仍然是工业应用中的一项重大挑战。在此，通过调整相分数以提高电容性能，报道了一种在钛酸钡基陶瓷中延迟饱和极化的通用方法。0.85(0.7BaTiO₃ - 0.3BiNaTiO₃)-0.15BiLi(TiTa)O₃陶瓷在700 kV/cm的击穿电场下具有7.16 J/cm³的超高可恢复能量密度（）以及约90%的效率（η），优于目前的钛酸钡基陶瓷和其他无铅陶瓷。同时，和η表现出宽频率、温度和循环疲劳稳定性。此外，还同时实现了115 ns的极快速放电时间和106.16 MW/cm²的大功率密度。这项工作为延迟饱和极化设计提供了一条有前景的途径，以制造可扩展的高能量密度陶瓷电容器，并突出了脉冲功率应用的研究前景。
