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<p>Polymer-based dielectric materials exhibit several advantages, including high power density and rapid charge/discharge rates, making them widely applicable across various fields. However, their inherently low energy density restricts their applications in energy storage. To overcome this limitation, this study introduces novel bismuth-layered Bi<sub>2</sub>LaTiNbO<sub>9</sub> (BLTN) nanosheets as inorganic fillers, applied to the design and fabrication of PVDF-based energy storage films. The moderate dielectric constant of BLTN helps mitigate the uneven electric field distribution caused by dielectric mismatch between the high-dielectric ferroelectric filler and the polymer matrix. The [Bi<sub>2</sub>O<sub>2</sub>]<sup>2+</sup> layer of BLTN functions as an insulating shell, inhibiting the movement of free electrons, thus reducing leakage current and conduction losses within the polymer matrix. The [LaTiNbO<sub>7</sub>]<sup>2−</sup> polarization layer contributes to the enhancement of polarization strength. Additionally, the higher bandgap (<i>E</i><sub>g</sub>) of BLTN nanosheets further enhances the breakdown electric field within polymer-based materials. Consequently, the 1.5 wt% BLTN-P(VDF-HFP) nanocomposite film achieves an outstanding recoverable energy density of 25.1&#xa0;J/cm<sup>3</sup> and energy efficiency of 78.6% at 580&#xa0;kV/mm, significantly surpassing that of pure P(VDF-HFP). Furthermore, the 1.5 wt% BLTN-P(VDF-HFP) composite also demonstrates excellent thermal stability within the temperature range of 25–125&#xa0;°C. These results suggest that bismuth-layered BLTN nanosheets serve as highly effective fillers for PVDF-based energy storage materials, offering greater design flexibility in the development of advanced flexible nanocomposite energy storage films.</p>

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Achieving excellent energy storage performance and thermal stability simultaneously in PVDF-based nanocomposites by designing the bismuth layer-structured fillers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月9日

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  • Shuo Liu,
  • Xiaojun Ren,
  • Yangyang Zhang,
  • Wuwei Feng,
  • He Qi,
  • Dengjie Luo,
  • Lixia Wang,
  • Youjian Zhu,
  • Chunming Bao,
  • Wangyang Li,
  • LinSen Zhang,
  • Yi Zhong

摘要

Polymer-based dielectric materials exhibit several advantages, including high power density and rapid charge/discharge rates, making them widely applicable across various fields. However, their inherently low energy density restricts their applications in energy storage. To overcome this limitation, this study introduces novel bismuth-layered Bi2LaTiNbO9 (BLTN) nanosheets as inorganic fillers, applied to the design and fabrication of PVDF-based energy storage films. The moderate dielectric constant of BLTN helps mitigate the uneven electric field distribution caused by dielectric mismatch between the high-dielectric ferroelectric filler and the polymer matrix. The [Bi2O2]2+ layer of BLTN functions as an insulating shell, inhibiting the movement of free electrons, thus reducing leakage current and conduction losses within the polymer matrix. The [LaTiNbO7]2− polarization layer contributes to the enhancement of polarization strength. Additionally, the higher bandgap (Eg) of BLTN nanosheets further enhances the breakdown electric field within polymer-based materials. Consequently, the 1.5 wt% BLTN-P(VDF-HFP) nanocomposite film achieves an outstanding recoverable energy density of 25.1 J/cm3 and energy efficiency of 78.6% at 580 kV/mm, significantly surpassing that of pure P(VDF-HFP). Furthermore, the 1.5 wt% BLTN-P(VDF-HFP) composite also demonstrates excellent thermal stability within the temperature range of 25–125 °C. These results suggest that bismuth-layered BLTN nanosheets serve as highly effective fillers for PVDF-based energy storage materials, offering greater design flexibility in the development of advanced flexible nanocomposite energy storage films.