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Abstract <p>High-power pulse systems demand dielectric ceramics with high recoverable energy storage density (<i>W</i><sub>rec</sub>), efficiency, and stability. Relaxor ferroelectrics are promising due to high polarization and low loss. In this work, a binary solid solution of 0.7Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-0.3Sr<sub>0.7</sub>Bi<sub>0.2</sub>TiO<sub>3</sub> was used as the base composition. A series of high-entropy relaxor ferroelectric ceramics, (1-<i>x</i>)(0.7NBT-0.3SBT)-<i>x</i>(Ca<sub>0.5</sub>Ba<sub>0.5</sub>)(In<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> (<i>x</i> = 0.05 ~ 0.30), featuring highly disordered crystal structures, were synthesized via a solid-state reaction method through simultaneous multi-cation doping at both the A- and B-sites. Characterization techniques including structural analysis, morphology observation, and basic electrical property measurements demonstrated that this A/B-site co-doping strategy effectively enhanced the relaxor characteristics. Systematic evaluation of energy storage performance identified the optimal composition (<i>x</i> = 0.1), which achieves a <i>W</i><sub>rec</sub> of 1.1&#xa0;J·cm<sup>−3</sup> at 110&#xa0;kV·cm<sup>−1</sup>, representing a relatively high value for bulk ceramics under moderate electric fields. These findings provide experimental support and a technical reference for developing high-performance energy storage ceramics.</p> Graphical abstract <p></p>

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Synergistic optimization of energy storage performance in Na0.5Bi0.5TiO3-based high-entropy ceramics via A/B-site co-doping

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Xiaolan Li,
  • Yang Li,
  • Xuexin Li,
  • Jihao Zhang,
  • Haozhang Wang,
  • Siheng Hu,
  • Ruixin Lei,
  • Wenyong Liao,
  • Chunchun Li,
  • Fei Li,
  • Jinglei Li

摘要

Abstract

High-power pulse systems demand dielectric ceramics with high recoverable energy storage density (Wrec), efficiency, and stability. Relaxor ferroelectrics are promising due to high polarization and low loss. In this work, a binary solid solution of 0.7Na0.5Bi0.5TiO3-0.3Sr0.7Bi0.2TiO3 was used as the base composition. A series of high-entropy relaxor ferroelectric ceramics, (1-x)(0.7NBT-0.3SBT)-x(Ca0.5Ba0.5)(In0.5Ta0.5)O3 (x = 0.05 ~ 0.30), featuring highly disordered crystal structures, were synthesized via a solid-state reaction method through simultaneous multi-cation doping at both the A- and B-sites. Characterization techniques including structural analysis, morphology observation, and basic electrical property measurements demonstrated that this A/B-site co-doping strategy effectively enhanced the relaxor characteristics. Systematic evaluation of energy storage performance identified the optimal composition (x = 0.1), which achieves a Wrec of 1.1 J·cm−3 at 110 kV·cm−1, representing a relatively high value for bulk ceramics under moderate electric fields. These findings provide experimental support and a technical reference for developing high-performance energy storage ceramics.

Graphical abstract