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MgO-Driven High-Entropy Engineering in (Bi<sub>0.5</sub>Na<sub>0.5</sub>)TiO<sub>3</sub>-Based Ceramics for Superior Energy Storage Performance.

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High-Performance Energy Storage in Ba(Al0.5Nb0.5)O3-Modified (Bi0.5Na0.5)TiO3-Based Lead-Free Ceramics via

Zhiqiang Zhang1, Fan Zhang1, Yiwen Niu1

  • 1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.

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Summary

High-entropy engineering enhances lead-free dielectric capacitors. Researchers achieved superior energy storage density and efficiency in novel ceramics, paving the way for advanced power applications.

Keywords:
(Bi0.5Na0.5)TiO3-based ceramicselectric breakdown strengthenergy storage performancehigh-entropy strategypolar nanoregions

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ceramics Engineering

Background:

  • Lead-free dielectric capacitors are crucial for high-power pulse devices, offering high power density and rapid charge-discharge capabilities.
  • Current lead-free materials face limitations in energy storage performance, necessitating advanced strategies for improvement.
  • The high-entropy strategy is emerging as a promising approach to enhance dielectric properties and energy storage in advanced ceramics.

Purpose of the Study:

  • To investigate the synergistic effect of high-entropy engineering on lead-free dielectric capacitors.
  • To optimize the energy storage characteristics of (Bi0.5Na0.5)TiO3-based ceramics by introducing Ba(Al0.5Nb0.5)O3.
  • To explore the potential of high-entropy ceramics for next-generation energy storage applications.

Main Methods:

  • Synthesis of lead-free (Bi0.5Na0.5)TiO3-based ceramics with varying compositions, incorporating Ba(Al0.5Nb0.5)O3 (BAN).
  • Characterization of the structural, dielectric, and energy storage properties of the synthesized high-entropy ceramics.
  • Analysis of the relationship between composition, microstructure, and energy storage performance, including breakdown strength and charge-discharge behavior.

Main Results:

  • A novel high-entropy ceramic, 0.85(0.6(Bi0.5Na0.5)TiO3-0.4(Sr0.7Bi0.2)TiO3)-0.15BAN, demonstrated superior energy storage density (Wrec ~7.40 J/cm3) and efficiency (η ~85.5%).
  • The material achieved a high breakdown strength (Eb ~547 kV/cm), attributed to increased entropy, grain refinement, enhanced relaxation, polar nanoregions, and a widened band gap.
  • Excellent thermal and frequency stability, along with robust charge-discharge performance, were observed.

Conclusions:

  • High-entropy engineering is a viable and effective strategy for significantly improving the energy storage performance of lead-free dielectric capacitors.
  • The developed high-entropy ceramic exhibits promising characteristics for practical applications in high-power pulse devices.
  • This research provides a new pathway for designing advanced lead-free dielectric materials with enhanced energy storage capabilities.