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<p>To further improve the energy storage performance of NaNbO<sub>3</sub>-based ceramics, which are widely regarded as promising candidates for advanced energy storage devices, Sm<sub>2</sub>O<sub>3</sub> was doped into 0.9NaNbO<sub>3</sub>—0.1BiMg<sub>0.5</sub>Ti<sub>0.5</sub>O<sub>3</sub> ceramic matrix via a conventional solid-state reaction method. The results show that Sm<sup>3</sup>⁺ ions can effectively regulate the phase composition of the ceramics, significantly improve their relaxation behavior, refine the grain size, and effectively reduce the concentration of oxygen vacancies, thereby optimizing the overall energy storage properties. At the doping amount of x = 0.03, the ceramic sample achieved a recoverable energy storage density (W<sub>rec</sub>) of 5.51&#xa0;J/cm<sup>3</sup> and an energy storage efficiency of 80.2% under an electric field of 450&#xa0;kV/cm, with excellent temperature stability over a wide range. Meanwhile, it also exhibited an ultrafast discharge rate of 20.8&#xa0;ns, a high current density of 984.64 A/cm<sup>2</sup>, and a superior power density of 89.71&#xa0;MW/cm<sup>3</sup>, indicating great application potential in high-power energy storage fields.</p>

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Regulation of oxygen vacancy concentration and grain refinement via Sm2O3 doping for synergistic enhancement of energy storage performance of NN-BMT-based ceramics

  • 期刊论文

  • 发表日期：

    2026年4月26日

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  • Hanlv Li,
  • Xiusheng Wu,
  • Hongjuan Wen,
  • Naiji Zhou,
  • Jufang Cao,
  • Xuejun Xin

摘要

To further improve the energy storage performance of NaNbO3-based ceramics, which are widely regarded as promising candidates for advanced energy storage devices, Sm2O3 was doped into 0.9NaNbO3—0.1BiMg0.5Ti0.5O3 ceramic matrix via a conventional solid-state reaction method. The results show that Sm3⁺ ions can effectively regulate the phase composition of the ceramics, significantly improve their relaxation behavior, refine the grain size, and effectively reduce the concentration of oxygen vacancies, thereby optimizing the overall energy storage properties. At the doping amount of x = 0.03, the ceramic sample achieved a recoverable energy storage density (Wrec) of 5.51 J/cm3 and an energy storage efficiency of 80.2% under an electric field of 450 kV/cm, with excellent temperature stability over a wide range. Meanwhile, it also exhibited an ultrafast discharge rate of 20.8 ns, a high current density of 984.64 A/cm2, and a superior power density of 89.71 MW/cm3, indicating great application potential in high-power energy storage fields.