High-entropy enhanced capacitive energy storage

Bingbing Yang, Yang Zhang, Hao Pan, Wenlong Si, Qinghua Zhang, Zhonghui Shen, Yong Yu, Shun Lan, Fanqi Meng, Yiqian Liu, Houbing Huang, Jiaqing He, Lin Gu, Shujun Zhang, Long Qing Chen, Jing Zhu, Ce Wen Nan, Yuan Hua Lin

Research output: Contribution to journalArticlepeer-review

200 Scopus citations

Abstract

Electrostatic dielectric capacitors are essential components in advanced electronic and electrical power systems due to their ultrafast charging/discharging speed and high power density. A major challenge, however, is how to improve their energy densities to effectuate the next-generation applications that demand miniaturization and integration. Here, we report a high-entropy stabilized Bi2Ti2O7-based dielectric film that exhibits an energy density as high as 182 J cm−3 with an efficiency of 78% at an electric field of 6.35 MV cm−1. Our results reveal that regulating the atomic configurational entropy introduces favourable and stable microstructural features, including lattice distorted nano-crystalline grains and a disordered amorphous-like phase, which enhances the breakdown strength and reduces the polarization switching hysteresis, thus synergistically contributing to the energy storage performance. This high-entropy approach is expected to be widely applicable for the development of high-performance dielectrics.

Original languageEnglish (US)
JournalNature Materials
DOIs
StatePublished - Sep 2022

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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