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<p>Dielectric capacitors are promising for pulsed power applications due to their high power density and fast charge–discharge capability. However, the energy storage performance of NaNbO<sub>3</sub> ceramics is often limited by the irreversible field-induced antiferroelectric-ferroelectric transition and insufficient breakdown strength. In this study, the high-entropy engineering was employed to construct a (1-x) NaNbO<sub>3</sub>-x(Na<sub>0.2</sub>Ba<sub>0.2</sub>Ca<sub>0.2</sub>La<sub>0.2</sub>Sr<sub>0.2</sub>)TiO<sub>3</sub> ceramic system. Due to the sluggish diffusion effect induced by the high-entropy components, grain boundary migration is suppressed, and the grain size gradually decreases with increasing composition. The results show that the 0.8NaNbO<sub>3</sub>-0.2(Na<sub>0.2</sub>Ba<sub>0.2</sub>Ca<sub>0.2</sub>La<sub>0.2</sub>Sr<sub>0.2</sub>)TiO<sub>3</sub> ceramic exhibits a recoverable energy density (<i>W</i><sub>rec</sub>) of 3.9 J/cm<sup>3</sup> and an energy storage efficiency of 80.5% under an electric field of 400 kV/cm. The introduction of the (Na<sub>0.2</sub>Ba<sub>0.2</sub>Ca<sub>0.2</sub>La<sub>0.2</sub>Sr<sub>0.2</sub>)TiO<sub>3</sub> increases the local structural disorder and lattice distortion in NN ceramics, enhances the relaxor characteristics of the system, and stabilizes the antiferroelectric R phase, thereby enabling the NN-NBCLST ceramics to exhibit relatively good energy-storage performance under moderate electric fields. This study indicates that high-entropy engineering is an effective route to enhance the energy storage performance of NaNbO<sub>3</sub>-based ceramics.</p>

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Enhanced energy storage performance by stabilizing antiferroelectric phase through high-entropy engineering of NaNbO3

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Sheng Li,
  • Xian Du,
  • Yang Gao,
  • Aohan Fan,
  • Yingying Zhao,
  • Huiling Du

摘要

Dielectric capacitors are promising for pulsed power applications due to their high power density and fast charge–discharge capability. However, the energy storage performance of NaNbO3 ceramics is often limited by the irreversible field-induced antiferroelectric-ferroelectric transition and insufficient breakdown strength. In this study, the high-entropy engineering was employed to construct a (1-x) NaNbO3-x(Na0.2Ba0.2Ca0.2La0.2Sr0.2)TiO3 ceramic system. Due to the sluggish diffusion effect induced by the high-entropy components, grain boundary migration is suppressed, and the grain size gradually decreases with increasing composition. The results show that the 0.8NaNbO3-0.2(Na0.2Ba0.2Ca0.2La0.2Sr0.2)TiO3 ceramic exhibits a recoverable energy density (Wrec) of 3.9 J/cm3 and an energy storage efficiency of 80.5% under an electric field of 400 kV/cm. The introduction of the (Na0.2Ba0.2Ca0.2La0.2Sr0.2)TiO3 increases the local structural disorder and lattice distortion in NN ceramics, enhances the relaxor characteristics of the system, and stabilizes the antiferroelectric R phase, thereby enabling the NN-NBCLST ceramics to exhibit relatively good energy-storage performance under moderate electric fields. This study indicates that high-entropy engineering is an effective route to enhance the energy storage performance of NaNbO3-based ceramics.