Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Abstract

Improving the tolerance of flexible polymers to extreme temperatures and electrical fields is critical to the development of advanced electrical and electronic systems. Suppressing carrier movement at high temperatures is...

Depressing relaxation and conduction loss of polar polymer materials by inserting bulky charge traps for superior energy storage performance in high-pulse energy storage capacitor applications

“…On the other hand, the quickly accumulated Joule heat from energy loss reduces the breakdown strength and damage the thermal stability of the polymer-based dielectrics, and thus reduces the lifetime of the capacitors. 10,11 …”

High-Energy-Storage Dielectric Performance of Sandwich PI-Based Composite over a Wide Temperature Range

“…The polymer long chains become more fragile at high temperatures and are susceptible to failure by high-energy electron attack. And the addition of 1DTiO 2 will lead to a high distortion electric field at the interface between 1DTiO 2 and PI, resulting in a higher charge density at the interface, making the breakdown more likely to occur. ,− The high forbidden bandwidth of 0DAl 2 O 3 nanoparticles can increase the potential trap in the composite films, effectively trap the free electrons inside the material, and suppress the Schottky emission of the injected charge in the nanocomposite. , The collisional excitation of the carriers themselves generates a large amount of heat, leading to thermal damage and decomposition of the polymer . The high thermal conductivity of 0DAl 2 O 3 can quickly dissipate the internal heat of the composite films in the environment, thus preventing the composite films from thermal breakdown.…”

In Situ Self-Fluorescence 3D Imaging of Micro/Nano Damage in Silicone Gel for Understanding Insulation Failure under High-Frequency Electric Fields

“…Under the action of an electric field, small defects, such as voids, dirt, and metal particles, can cause partial discharge inside the polymer. High switching frequencies and sustained electrothermal stress can cause physical and electrical damage to insulation materials, and material degradation caused by electron avalanche makes polymers more sensitive to electrical breakdown. , The microscopic region around a defect is more likely to be prone to partial discharge due to the concentrated electric field, , accelerating the damage process, destroying the material structure, and leading to the formation of a dendritic structure known as an electric tree. The growth process of an electric tree can be divided into four stages, as shown in Figure a.…”