Polypropylene film capacitor energy storage

Why are polypropylene based dielectric film capacitors not suitable?

Polypropylene (PP)-based dielectric film capacitors cannot meet the rapid development requirements of electromagnetic energy equipment because of their low energy storage density (Ue). The development of new dielectric materials is hampered by the trade-off between high energy storage properties and thin film processibility for capacitors.

Why do polymeric film capacitors have a high energy storage density?

However, the development of film capacitor towards high energy storage density is severely hindered by the low dielectric constant (ε) and low charge-discharge efficiency (η) of the polymeric films. The film of polypropylene (PP), the most used polymeric film with a market share of 50%, owns a high η due to its low inherent hysteresis loss.

What is a film capacitor?

Film capacitor, one typical type of electrostatic capacitors, exhibits its unique advantages in the high-power energy storage devices operating at a high electric field due to the high electrical breakdown strength (Eb) of the polymeric films.

What are metallized film capacitors?

Metallized film capacitors towards capacitive energy storage at elevated temperatures and electric field extremes call for high-temperature polymer dielectrics with high glass transition temperature (Tg), large bandgap (Eg), and concurrently excellent self-healing ability.

Can a film capacitor be used in high-power fields?

However, the application of film capacitor in those high-power fields is severely hindered by its low energy storage density [6, 9, 10]. The energy storage density of a film capacitor is generally determined by the energy storage density of the dielectric polymer sandwiched between two electrodes.

What is a novel dielectric layer for high energy density film capacitors?

A straightforward approach is replacing the non-polar PP with ferroelectric polymers, represented by poly (vinylidene fluoride) (PVDF) and its copolymers, as a novel dielectric layer for the high energy density film capacitors due to their high ε (~10.0) [, , ].