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<p>The low energy storage density of dielectric capacitors limits their application in next-generation electronic devices. To address this, we design and fabricate a polyetherimide (PEI)/polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) bilayer film. By precisely adjusting the thickness ratio between the two layers, we achieve active regulation of the internal electric field distribution, thereby synergistically enhancing energy storage performance. Leveraging the significant dielectric contrast between the highly insulating PEI and the high-polarization PVDF-TrFE, the external electric field is redistributed, concentrating a higher field strength in the PEI layer. This electric field management strategy, based on thickness ratio optimization, progressively reduces the field borne by each layer as the PEI proportion increases, thereby improving the overall voltage resistance. At an optimal thickness ratio of 5:1 (PEI:PVDF-TrFE), the bilayer film exhibits a discharged energy density of 13.5&#xa0;J/cm<sup>3</sup> with a high efficiency of 76.2% at 650&#xa0;kV/mm. This work demonstrates the feasibility of synchronously enhancing breakdown strength and energy density via interfacial electric-field design, offering a novel pathway for developing high-performance polymer film capacitors.</p>

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Regulating Internal Electric Field Distribution in PEI/PVDF-TrFE Bilayer Films for High Energy Storage Density

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Yang Cui,
  • Han Chen,
  • Guang Liu,
  • Chen Chen,
  • Yanan Shang,
  • Yi Zhang,
  • Shubin Yan

摘要

The low energy storage density of dielectric capacitors limits their application in next-generation electronic devices. To address this, we design and fabricate a polyetherimide (PEI)/polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) bilayer film. By precisely adjusting the thickness ratio between the two layers, we achieve active regulation of the internal electric field distribution, thereby synergistically enhancing energy storage performance. Leveraging the significant dielectric contrast between the highly insulating PEI and the high-polarization PVDF-TrFE, the external electric field is redistributed, concentrating a higher field strength in the PEI layer. This electric field management strategy, based on thickness ratio optimization, progressively reduces the field borne by each layer as the PEI proportion increases, thereby improving the overall voltage resistance. At an optimal thickness ratio of 5:1 (PEI:PVDF-TrFE), the bilayer film exhibits a discharged energy density of 13.5 J/cm3 with a high efficiency of 76.2% at 650 kV/mm. This work demonstrates the feasibility of synchronously enhancing breakdown strength and energy density via interfacial electric-field design, offering a novel pathway for developing high-performance polymer film capacitors.