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<p>Lead-free antiferroelectric (AFE) ceramics based on sodium niobate (NaNbO<sub>3</sub>, NN) have garnered interest owing to their outstanding capacity for energy storage. Nevertheless, the utilization of pure NN ceramics is restricted due to their high loss energy density (<i>W</i><sub>loss</sub>) and low breakdown electric field (<i>E</i><sub><i>b</i></sub>), which result from the field-induced AFE-ferroelectric (FE) phase transition. To address these issues, Bi and Ta were introduced into the A and B sites of the NN ceramic perovskite structure, respectively. This could change the crystal structure and electronic structure of NaNbO₃, consequently boosting the material’s energy storage performance. After that, Ta elements were embedded in the B-sites of (Na<sub>0.86</sub>Bi<sub>0.14</sub>)(Nb<sub>0.9</sub>Ti<sub>0.1</sub>)O<sub>3</sub> powder, and (Na<sub>0.86</sub>Bi<sub>0.14</sub>)(Nb<sub>0.9−x</sub>Ta<sub>x</sub>Ti<sub>0.1</sub>)O<sub>3</sub> ceramics were subsequently produced via traditional solid-phase reaction method. According to the XRD analysis, the compositional modification enabled the fabrication of ceramics with a typical perovskite structure and excellent energy storage performance. At <i>x</i> = 0.15, the relaxation degree reached the maximum, and the relaxation factor <i>γ</i> attained 1.8850. the (Na<sub>0.86</sub>Bi<sub>0.14</sub>)(Nb<sub>0.75</sub>Ta<sub>0.15</sub>Ti<sub>0.1</sub>)O<sub>3</sub> exhibits favorable temperature stability in the range of 25–125&#xa0;°C. In particular, the (Na<sub>0.86</sub>Bi<sub>0.14</sub>)(Nb<sub>0.75</sub>Ta<sub>0.15</sub>Ti<sub>0.1</sub>)O<sub>3</sub> ceramic exhibited an energy capacity density <i>W</i><sub>rec</sub> of about 2.41&#xa0;J·cm<sup>−3</sup> and an efficiency <i>η</i> of about 90.88% under a breakdown electric field (<i>E</i><sub><i>b</i></sub> = 206.92&#xa0;kV&#xa0;cm<sup>−1</sup>). In particular, the (Na<sub>0.86</sub>Bi<sub>0.14</sub>)(Nb<sub>0.75</sub>Ta<sub>0.15</sub>Ti<sub>0.1</sub>)O<sub>3</sub> ceramic exhibited an energy capacity density <i>W</i><sub>rec</sub> of about 2.41&#xa0;J&#xa0;cm<sup>−3</sup> and an efficiency <i>η</i> of about 90.88% under a breakdown electric field (<i>E</i><sub><i>b</i></sub> = 206.92&#xa0;kV&#xa0;cm<sup>−1</sup>). Therefore, the findings of this study reveal that doping antiferroelectric sodium niobate ceramics with tantalum is a reliable way to improve their dielectric energy storage capacity.</p>

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Advanced combination optimization tactics for enhancing the comprehensive energy storage performance of sodium niobate-based ceramic materials

  • 期刊论文

  • 发表日期：

    2025年11月16日

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  • Mo Zhao,
  • Wei Wu,
  • Jiejie Hui,
  • Jinxi Li,
  • Wenbing Wang,
  • Chuanbao Du,
  • Jing Yang,
  • Jinghai Guo,
  • Xutong Wang,
  • Yifu Zhou,
  • Yangxi Yan,
  • Li Jin

摘要

Lead-free antiferroelectric (AFE) ceramics based on sodium niobate (NaNbO3, NN) have garnered interest owing to their outstanding capacity for energy storage. Nevertheless, the utilization of pure NN ceramics is restricted due to their high loss energy density (Wloss) and low breakdown electric field (Eb), which result from the field-induced AFE-ferroelectric (FE) phase transition. To address these issues, Bi and Ta were introduced into the A and B sites of the NN ceramic perovskite structure, respectively. This could change the crystal structure and electronic structure of NaNbO₃, consequently boosting the material’s energy storage performance. After that, Ta elements were embedded in the B-sites of (Na0.86Bi0.14)(Nb0.9Ti0.1)O3 powder, and (Na0.86Bi0.14)(Nb0.9−xTaxTi0.1)O3 ceramics were subsequently produced via traditional solid-phase reaction method. According to the XRD analysis, the compositional modification enabled the fabrication of ceramics with a typical perovskite structure and excellent energy storage performance. At x = 0.15, the relaxation degree reached the maximum, and the relaxation factor γ attained 1.8850. the (Na0.86Bi0.14)(Nb0.75Ta0.15Ti0.1)O3 exhibits favorable temperature stability in the range of 25–125 °C. In particular, the (Na0.86Bi0.14)(Nb0.75Ta0.15Ti0.1)O3 ceramic exhibited an energy capacity density Wrec of about 2.41 J·cm−3 and an efficiency η of about 90.88% under a breakdown electric field (Eb = 206.92 kV cm−1). In particular, the (Na0.86Bi0.14)(Nb0.75Ta0.15Ti0.1)O3 ceramic exhibited an energy capacity density Wrec of about 2.41 J cm−3 and an efficiency η of about 90.88% under a breakdown electric field (Eb = 206.92 kV cm−1). Therefore, the findings of this study reveal that doping antiferroelectric sodium niobate ceramics with tantalum is a reliable way to improve their dielectric energy storage capacity.