Application Status of High Entropy Strategy in Dielectric Energy Storage Capacitors
College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China
| Abstract: | As a crucial method of energy storage, dielectric capacitors have garnered significant attention due to their exceptional power density and rapid charging and discharging speed. They play a vital role in high-power energy storage and pulse power systems such as new energy vehicles, industrial lasers, and advanced electromagnetic weapons. However, the most critical technical challenge for dielectric capacitors lies in their lower energy storage density, which limits the application of miniaturization and integrated devices. Therefore, enhancing the energy storage density is imperative for the advancement of dielectric capacitors. In recent years, configuration entropy has emerged as an excellent strategy for regulating the energy storage performance of dielectric materials. Serving as a quantitative indicator to evaluate the non-uniformity of local components, entropy provides the necessary structural foundation to achieve desirable dielectric relaxation properties. Moreover, employing high entropy strategies can generate lattice distortion and high entropy effects that significantly enhance factors like breakdown field strength and polarization intensity while demonstrating remarkable adjustability and practicality. This article reviews both domestic and foreign scholars' research achievements in utilizing high entropy strategies for dielectric energy storage capacitors while providing a detailed introduction to comprehensive improvements in tungsten bronze, pyrochlore, and perovskite-type structural systems based on high entropy oxide structures regarding their overall energy storage performance enhancement. The research progress achieved under the synergistic effect of high entropy strategies is comprehensively summarized from design concepts to materials aspects. Finally, this paper discusses open problems faced by high entropy strategies in optimizing the energy storage performance of dielectric capacitors along with potential development directions. |
| Keywords: | High Entropy Strategy; Energy Storage; Review; Dielectric Capacitor; Structural System |
| DOI: | 10.57237/j.mater.2023.06.002 |
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Received: 8 December 2023
Accepted: 24 January 2024
Published Online: 4 February 2024
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