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<p>The development of dielectric ceramics with superior energy density and efficiency at high dielectric breakdown strength poses a significant challenge for high-power pulse devices and energy storage capacitors. In the present study, we aim to improve the energy storage performance of tungsten bronze structure and perovskite composite ceramics via configurational entropy (Δ<i>S</i>) and interfacial polarization strategies. The (1−x)(Ba<sub>0.34</sub>Sr<sub>0.33</sub>Ca<sub>0.33</sub>)Nb<sub>2</sub>O<sub>6</sub>-xAgNbO<sub>3</sub> ceramics [(1−x)BCSN–xAN] (x = 0.0, 0.05, and 0.1) were prepared using the solid solution technique in air. The increase in entropy at high concentrations of AgNbO<sub>3</sub>-AN caused cation disorder, improved crystal lattice symmetry, and disrupted the long-range ordering of BCSN, which in turn regulated the relaxation behavior. Furthermore, the lower ionic radius of Ag<sup>1+</sup> compared to A-site cations induced a reduction in grain size, an increase in the conductivity activation energy, and an increase in grain resistance, which collectively enhanced the breakdown strength at high AN content. The interfacial polarization (Δ<i>f</i>) decreased from 18,596&#xa0;Hz to 2320&#xa0;Hz in the high-entropy ceramic, indicating improved breakdown strength. This cascade effect results in outstanding energy storage performance, ultimately achieving a recoverable energy density (<i>W</i><sub>rec</sub>) of 6.9&#xa0;J/cm<sup>3</sup> and efficiency (<i>η</i>) of 90.4% in 0.95BCSN-0.05AN ceramics, along with ultrahigh breakdown strength <i>E</i><sub>b</sub> of 710&#xa0;kV/cm. This research indicates that entropy and interfacial polarization are effective methods for designing tetragonal tungsten bronze dielectric ceramics with ultrahigh comprehensive energy storage performance.</p>

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Enhancement of Energy Storage Properties of (Ba,Sr)Nb2O6–AgNbO3 Composite Ceramics via Entropy and Interfacial Polarization Strategies

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Manal Alhazmi,
  • Afaf M. Babeer,
  • Najla Alnami,
  • M. Jaouadi,
  • K. A. Aly,
  • Yasser A. M. Ismail,
  • Abd El-razek Mahmoud

摘要

The development of dielectric ceramics with superior energy density and efficiency at high dielectric breakdown strength poses a significant challenge for high-power pulse devices and energy storage capacitors. In the present study, we aim to improve the energy storage performance of tungsten bronze structure and perovskite composite ceramics via configurational entropy (ΔS) and interfacial polarization strategies. The (1−x)(Ba0.34Sr0.33Ca0.33)Nb2O6-xAgNbO3 ceramics [(1−x)BCSN–xAN] (x = 0.0, 0.05, and 0.1) were prepared using the solid solution technique in air. The increase in entropy at high concentrations of AgNbO3-AN caused cation disorder, improved crystal lattice symmetry, and disrupted the long-range ordering of BCSN, which in turn regulated the relaxation behavior. Furthermore, the lower ionic radius of Ag1+ compared to A-site cations induced a reduction in grain size, an increase in the conductivity activation energy, and an increase in grain resistance, which collectively enhanced the breakdown strength at high AN content. The interfacial polarization (Δf) decreased from 18,596 Hz to 2320 Hz in the high-entropy ceramic, indicating improved breakdown strength. This cascade effect results in outstanding energy storage performance, ultimately achieving a recoverable energy density (Wrec) of 6.9 J/cm3 and efficiency (η) of 90.4% in 0.95BCSN-0.05AN ceramics, along with ultrahigh breakdown strength Eb of 710 kV/cm. This research indicates that entropy and interfacial polarization are effective methods for designing tetragonal tungsten bronze dielectric ceramics with ultrahigh comprehensive energy storage performance.