Synergistically enhanced discharged energy density and efficiency achieved in designed polyetherimide-based...

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Current energy storage dielectrics struggle to meet demands for high energy density, efficiency, and high-temperature performance.
• Advancements in energy storage technologies require improved dielectric materials for practical applications.

Purpose of the Study:

• To develop a novel composite dielectric film with superior energy storage capabilities.
• To address the limitations of existing dielectric materials in terms of energy density, efficiency, and thermal stability.

Main Methods:

• Fabrication of asymmetrical multilayered composites using polyetherimide (PEI) and boron nitride (BN) nanosheets.
• Doping the composites with Na0.5Bi0.5TiO3 ceramic fibers to enhance dielectric properties.
• Utilizing finite element simulations and experimental validation to optimize interface effectiveness and filler configuration.

Main Results:

• Achieved a discharged energy density (Ue) of 22.95 J cm⁻³ and energy storage efficiency (η) of 96.81% at ambient temperature.
• Demonstrated high-temperature performance with Ue of 12.88 J cm⁻³ and η of 79.26% at 150 °C.
• The novel composite film surpasses previously reported polymer films in both energy density and efficiency.

Conclusions:

• The developed PEI-based composite film with BN nanosheets and ceramic fibers shows significant potential for high-performance energy storage applications.
• The innovative interlayer design and tailored interface configuration offer a promising strategy for developing advanced dielectric materials.
• This research provides valuable insights for the future design of energy storage dielectrics suitable for demanding operational conditions.