Lineare dielektrische Energiespeicherdichte

Werden elektrische Energie oder Wärmeenergie nicht direkt während eines Umwandlungsprozesses sondern zu einem späteren Zeitpunkt benötigt, müssen sie

What is the research status of different energy storage dielectrics?

The research status of different energy storage dielectrics is summarized, the methods to improve the energy storage density of dielectric materials are analyzed and the development trend is prospected. It is expected to provide a certain reference for the research and development of energy storage capacitors.

What are the characteristics of energy storage dielectrics?

For the energy storage dielectrics, the characteristics of high dielectric constant, low loss, large polarization difference (Δ P = Pmax - Pr), high breakdown strength, and good temperature stability are expected simultaneously to meet the application requirements.

How to evaluate energy storage performance of dielectrics?

The accumulated energy in the capacitor during several charging cycles can be quickly released to generate a strong pulse power. Besides U, Urec, and η, the temperature stability, fatigue endurance, and discharge time are also important parameters for evaluating the energy storage performance of the dielectrics.

What is a linear dielectric?

The linear dielectrics are generally glass. Glass has quite low porosity and high breakdown strength; however, its dielectric constant and energy density are quite low. By annealing, glass crystallizes into glass ceramics. Compared with glass, the glass ceramics have higher dielectric constant, accordingly, the energy storage density is greater.

What is the dielectric constant and energy storage density of organic materials?

The dielectric constant and energy storage density of pure organic materials are relatively low. For example, the εr of polypropylene (PP) is 2.2 and the energy storage density is 1.2 J/cm 3, while 12 and 2.4 J/cm 3 for polyvinylidene fluoride (PVDF) .

What are the advantages of linear dielectrics?

Superior recoverable energy density of 4.9 J/cm 3 and efficiency of 95% are attained in linear dielectrics. For the first time, microwave materials are introduced into linear dielectrics. The x =0.005 ceramic shows excellent thermal stability and frequency stability with an ultra-fast discharge speed.