Energy storage mechanism of dielectric capacitor

Are dielectric capacitors suitable for high-performance energy storage systems?

Dielectric capacitors are promising candidates for high-performance energy storage systems due to their high power density and increasing energy density. However, the traditional approach strategies to enhance the performance of dielectric capacitors cannot simultaneously achieve large capacitance and high breakdown voltage.

What are energy storage capacitors?

Capacitors exhibit exceptional power density, a vast operational temperature range, remarkable reliability, lightweight construction, and high efficiency, making them extensively utilized in the realm of energy storage. There exist two primary categories of energy storage capacitors: dielectric capacitors and supercapacitors.

How does a dielectric capacitor work?

In comparison to various electrical storage devices like batteries, dielectric capacitors possess the capability to discharge stored energy in an extremely brief timeframe (microseconds), resulting in the generation of substantial power pulses .

What factors affect the energy storage performance of dielectric capacitors?

In other words, the energy storage performance of dielectric capacitors could be affected by various factors in its full-life cycle, such as intrinsic material features, device structure and service environment, resulting in significant challenges in the design and optimization.

What is the energy storage mechanism of a dielectric?

The energy storage mechanism of a dielectric relies on its polarization process triggered by an electric field . When an electric field is applied, the dielectric becomes polarized, leading to the accumulation of equal amounts of positive and negative charges on its surface.

What is the energy density of ha-AAO dielectric capacitor?

The capacitance density of about 47 μF/cm 2 for 6-μm-thick HA-AAO was achieved, and the breakdown voltage of about 15 V was observed. As a result, the energy density of the unique dielectric capacitor can reach about 2 Wh/kg through optimizing the fabrication process.