Enhanced Energy Storage Capacity in NBT Micro-Flake Incorporated PVDF Composites

Area of Science:

• Materials Science
• Energy Storage

Background:

• Dielectric films are crucial for energy storage in renewable energy, electronics, and power systems.
• Energy storage relies on material polarization/depolarization under electric fields for high power density and efficiency.

Purpose of the Study:

• To enhance the energy storage capacity of dielectric films using modified sodium bismuth titanate (NBT) micro-flakes within a polyvinylidene fluoride (PVDF) matrix.
• To investigate interfacial engineering strategies for improved dielectric performance.

Main Methods:

• Synthesized NBT micro-flakes via molten salt method, treated with hydrogen peroxide.
• Fabricated PVDF-NBT composite thin films using oriented tape-casting.
• Analyzed interfacial and chemical interactions between NBT and PVDF.

Main Results:

• Modified NBT micro-flakes improved interfacial interactions between ceramic fillers and the PVDF matrix.
• Chemical interactions promoted the phase transition of PVDF from α to β phase.
• Energy storage density increased by 110%, from 2.8 J cm⁻³ to 6.1 J cm⁻³.

Conclusions:

• The developed PVDF-NBT composite exhibits significantly enhanced energy storage density.
• Interfacial and chemical modifications are key to improving dielectric film performance.
• This strategy offers potential for next-generation energy storage devices.