Aromatic Polyamide-based Dielectric Materials for High-temperature Energy Storage Capacitor Applications

Dielectric capacitors are essential in high-power applications due to their remarkable power density, which stands unrivaled among energy storage devices. Among various materials for capacitive energy storage, polymer dielectrics have emerged as a major choice due to their high breakdown strength, self-healing capabilities, and relatively low manufacturing costs. The demand for capacitors that can operate reliably under extreme conditions has increased in recent years. However, improving the performance of polymer dielectric capacitors for high-temperature applications remains a significant challenge. Aromatic polyamides, known as high-performance polymeric materials, exhibit excellent heat resistance and mechanical properties. The presence of polar amide groups in their structure contributes to a high dielectric constant. Additionally, the strong hydrogen bonding between the molecular chains allows for close packing, thereby increasing the breakdown strength. The superior dielectric properties make aromatic polyamides promising candidates for high-temperature energy storage capacitors. This chapter provides an overview of recent progress in aromatic polyamide dielectric materials, discusses the challenges faced in their study, and concludes with a forward-looking perspective on their future development.