High-Temperature Energy Storage Performance of Polyimide Nanocomposites Enhanced by Core-Shell BT-BMT@SiO₂

Area of Science:

• Materials Science
• Nanotechnology
• Ceramics

Background:

• Advanced electrical systems require high-temperature dielectric capacitors.
• Polyimide (PI) offers thermal stability but has limitations in dielectric constant and breakdown strength for energy storage.
• Existing materials struggle to meet the demanding performance requirements of modern electronics.

Purpose of the Study:

• To develop a high-performance dielectric material for high-temperature capacitors.
• To enhance the energy storage capabilities of polyimide by incorporating ceramic nanocomposites.
• To investigate the synergistic effects of core-shell structures on dielectric properties.

Main Methods:

• Fabrication of a nanocomposite using amorphous SiO2-coated relaxor ferroelectric ceramic (BT-BMT@SiO2) and polyimide (PI).
• Characterization of the nanocomposite's dielectric properties, breakdown strength, and energy storage performance at elevated temperatures.
• Utilizing a core-shell structure to improve the organic-inorganic interface and reduce dielectric mismatch.

Main Results:

• The 0.25 vol.% BT-BMT@SiO2/PI composite exhibited a breakdown field strength of 381.81 MV/m at 150 °C.
• Maximum discharge energy density reached 1.14 J/cm³ at 150 °C, a 67% increase over pure PI.
• The core-shell structure effectively enhanced the dielectric constant and breakdown strength synergistically.

Conclusions:

• The synergistic design of relaxor ferroelectric ceramics and core-shell interfaces is a viable strategy for improving PI-based dielectric materials.
• The developed nanocomposite demonstrates significant potential for high-temperature energy storage applications.
• This research provides valuable insights for developing next-generation capacitor materials for demanding electronic systems.