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<p>Interfacial effects and surface defects play a significant role in determining the properties of dielectric films. In this study, Au/PVDF films were fabricated using polyvinylidene fluoride (PVDF) as the polymer matrix and gold (Au) nanoparticles as fillers. Additionally, Al<sub>2</sub>O<sub>3</sub>–Au/PVDF films (AO-Au/PVDF) were produced by depositing a layer of aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) onto the film surfaces through magnetron sputtering. The interfacial interactions between the Al<sub>2</sub>O<sub>3</sub> layer and the Au/PVDF film, along with the role of Al<sub>2</sub>O<sub>3</sub> in mitigating surface defects, were investigated concerning dielectric properties, real-time breakdown morphology on electrode surfaces, breakdown strength, and energy storage density at electrode sizes of 1&#xa0;mm, 2&#xa0;mm, 4&#xa0;mm, and 8&#xa0;mm. Compared to Au/PVDF films, AO-Au/PVDF films demonstrated relatively fewer breakdown points on their electrode surfaces. The breakdown strength improved by 7.7%, 8.8%, 6.3%, and 8.2% for the respective electrode sizes; consequently, this enhancement resulted in an increase in energy storage density. The incorporation of an Al<sub>2</sub>O<sub>3</sub> layer effectively reduced surface defects within the film while decreasing the occurrence of partial breakdown points. This improvement contributed to enhanced breakdown strength and energy storage density while facilitating compatibility with larger-sized electrodes.</p>

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Enhancing Energy Storage and Electrode Scalability in Au/PVDF Composite Films Through Al2O3 Interface Engineering

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Peicong Yang,
  • Xiucai Wang,
  • Wenbo Zhu,
  • Pan Wang,
  • Baoyu Du,
  • Huidong Wang,
  • Jianwen Chen,
  • Xinmei Yu,
  • Min Chen,
  • Shuwen Luo,
  • Yu Huang,
  • Shikuan Sun

摘要

Interfacial effects and surface defects play a significant role in determining the properties of dielectric films. In this study, Au/PVDF films were fabricated using polyvinylidene fluoride (PVDF) as the polymer matrix and gold (Au) nanoparticles as fillers. Additionally, Al2O3–Au/PVDF films (AO-Au/PVDF) were produced by depositing a layer of aluminum oxide (Al2O3) onto the film surfaces through magnetron sputtering. The interfacial interactions between the Al2O3 layer and the Au/PVDF film, along with the role of Al2O3 in mitigating surface defects, were investigated concerning dielectric properties, real-time breakdown morphology on electrode surfaces, breakdown strength, and energy storage density at electrode sizes of 1 mm, 2 mm, 4 mm, and 8 mm. Compared to Au/PVDF films, AO-Au/PVDF films demonstrated relatively fewer breakdown points on their electrode surfaces. The breakdown strength improved by 7.7%, 8.8%, 6.3%, and 8.2% for the respective electrode sizes; consequently, this enhancement resulted in an increase in energy storage density. The incorporation of an Al2O3 layer effectively reduced surface defects within the film while decreasing the occurrence of partial breakdown points. This improvement contributed to enhanced breakdown strength and energy storage density while facilitating compatibility with larger-sized electrodes.