Experimental report on the effect of dielectric constant on energy storage

What is the energy storage density of ceramic dielectrics?

First, the ultra-high dielectric constant of ceramic dielectrics and the improvement of the preparation process in recent years have led to their high breakdown strength, resulting in a very high energy storage density (40–90 J cm –3). The energy storage density of polymer-based multilayer dielectrics, on the other hand, is around 20 J cm –3.

Are dielectric constant and energy density overrated?

However, in the hot research field of dielectric materials, this effect has received little prior attention, and many publications reported their “exciting” values of dielectric constant and energy density which are actually overrated 17, 18, 19, 20, 21.

What is the energy storage density of a multilayer dielectric?

The results proved that the energy storage density (Ue) of the dielectric with layer number 8 reached more than 50 J cm –3 and the efficiency reached more than 70% at room temperature. The experimental data also show that the multilayer structure exhibits excellent temperature stability.

Why do polymer-based dielectrics have a low energy storage density?

As mentioned above, polymer-based dielectrics suffer from a low polarization strength/dielectric constant (<10 in most cases,) in comparison to electroceramics whose relative dielectric constant can reach to hundreds and even thousands, which is the main reason for its low energy storage density.

Can inorganic polymers improve the energy storage properties of a dielectric?

In addition to coating the dielectric with a broadband inorganic polymer, the introduction of an inorganic layer in the middle of the polymer can be considered to improve the energy storage properties of the dielectric.

Are high-temperature dielectric films suitable for energy storage?

Summary of high-temperature dielectric films recently developed for energy storage. Crosslinking is a good strategy to limit the molecular chain motion and is studied in several published works, demonstrating the reduced dielectric relaxation, improved breakdown strength, and efficiency of the film capacitors.