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<p>With the rapid development of modern electronic technology, the demand for high-performance dielectric materials is increasingly growing. Nanodielectrics, due to their unique nanostructure and interface effects, hold tremendous potential in energy storage, electronic packaging, capacitor manufacturing, and other fields. However, traditional dielectric materials suffer from issues such as low dielectric constant, insufficient breakdown strength, and high dielectric loss, which limit their performance. To address these challenges, researchers have continuously explored the preparation and modification methods of novel nanodielectric materials, with the preparation and study of PDA@MXene/Poly(vinylidene fluoride) (PVDF) nanodielectric films being particularly important. By synthesizing PDA@MXene and blending it with PVDF, the aim is to construct high-performance nanocomposites utilizing the excellent conductivity of PDA@MXene and the flexibility of PVDF polymer chains. A series of PDA@MXene/PVDF nanodielectric films with varying additions were prepared using a straightforward method. It was found that the hydrogen bonds formed at low filling concentrations increased the number of dipoles, forming a conductive network and significantly enhancing the dielectric constant. The PDA-PVDF charge buffer layer formed on the surface of PDA@MXene effectively hindered charge migration, mitigated the accumulation of space charge, improved the breakdown strength, and reduced the dielectric loss. After adding 1 wt% PDA@MXene, the energy storage density of the composite increased by 34.9% (reaching 5.37&#xa0;J/cm<sup>3</sup>), the dielectric constant increased by 16%, the breakdown strength increased by 11.5%, the dielectric loss decreased by 14.6%, and the charge–discharge efficiency improved by 28.4%. Despite these advancements, the optimization of material properties and the elucidation of interaction mechanisms remain ongoing research challenges. Based on the test data, a charge breakdown cycle model was proposed, and the mechanism of increased breakdown strength was investigated. Therefore, this composite material, featuring low dielectric loss and high dielectric constant, offers new possibilities for applications in efficient energy conversion and storage. It also holds significant potential for future applications in the field of energy storage and conversion.</p>

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Investigation of dielectric and energy storage properties of PDA@MXene/poly(vinylidene fluoride) nanodielectrics

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Jinqi Qin,
  • Hongwei Lu,
  • Shijia Yang,
  • Tin Tian,
  • Weitao Su

摘要

With the rapid development of modern electronic technology, the demand for high-performance dielectric materials is increasingly growing. Nanodielectrics, due to their unique nanostructure and interface effects, hold tremendous potential in energy storage, electronic packaging, capacitor manufacturing, and other fields. However, traditional dielectric materials suffer from issues such as low dielectric constant, insufficient breakdown strength, and high dielectric loss, which limit their performance. To address these challenges, researchers have continuously explored the preparation and modification methods of novel nanodielectric materials, with the preparation and study of PDA@MXene/Poly(vinylidene fluoride) (PVDF) nanodielectric films being particularly important. By synthesizing PDA@MXene and blending it with PVDF, the aim is to construct high-performance nanocomposites utilizing the excellent conductivity of PDA@MXene and the flexibility of PVDF polymer chains. A series of PDA@MXene/PVDF nanodielectric films with varying additions were prepared using a straightforward method. It was found that the hydrogen bonds formed at low filling concentrations increased the number of dipoles, forming a conductive network and significantly enhancing the dielectric constant. The PDA-PVDF charge buffer layer formed on the surface of PDA@MXene effectively hindered charge migration, mitigated the accumulation of space charge, improved the breakdown strength, and reduced the dielectric loss. After adding 1 wt% PDA@MXene, the energy storage density of the composite increased by 34.9% (reaching 5.37 J/cm3), the dielectric constant increased by 16%, the breakdown strength increased by 11.5%, the dielectric loss decreased by 14.6%, and the charge–discharge efficiency improved by 28.4%. Despite these advancements, the optimization of material properties and the elucidation of interaction mechanisms remain ongoing research challenges. Based on the test data, a charge breakdown cycle model was proposed, and the mechanism of increased breakdown strength was investigated. Therefore, this composite material, featuring low dielectric loss and high dielectric constant, offers new possibilities for applications in efficient energy conversion and storage. It also holds significant potential for future applications in the field of energy storage and conversion.