Bilayer-Structured Polymer Nanocomposites Exhibiting High Breakdown Strength and Energy Density via Interfacial Barrier Design

Abstract

The development of advanced dielectric materials with high breakdown strength, high dischargeable energy densities and great efficiencies is imperative to meet the ever-increasing demand of modern power systems and electronic devices. Herein, we present the layer-by-layer solution prepared bilayer-structured nanocomposite films with much enhanced capacitive performance via resolving the typical paradox between dielectric constant and breakdown strength in dielectric materials. The bilayered nanocomposite films are composed of Al2O3 dispersed in polystyrene as the interfacial barrier layer to inhibit electrical conduction and the polystyrene layer with TiO2 to enhance dielectric constant. The resulting layered film exhibits a discharged energy density of 4.43 J/cm 3 along with ultrahigh charge-discharge efficiencies of > 90%, which is among the highest energy densities ever achieved in the polystyrene-based dielectric polymer nanocomposites. In addition, the composite films show outstanding cyclic stability under high electric fields, which would enable the long-term efficient operation of film capacitors. This contribution represents an efficient route to high-energy-density dielectric composite materials using interfacial barrier architectures.

Excellent Stability in Polyetherimide/SiO2 Nanocomposites with Ultrahigh Energy Density and Discharge Efficiency at High Temperature

“…With the frequency increasing, the difference between U e and η is getting smaller, e.g., 7.10 J cm –3 measured at 200 Hz and 7.14 J cm –3 measure at 500 Hz. Generally, the U e of 3.56 J cm –3 with η above 90% at 10 Hz (Figure S16, Supporting Information) is higher than the most reported dielectric material with 0–3 nanocomposites measured at 150 °C, as shown in Figure 5d, [ 44,45 ] and is the largest energy density at industrial frequency, which makes PEI/SiO 2 ‐5vol% great potential for the practical use of dielectric polymer nanocomposites in electronics industry and electric power systems under extreme environment.…”

Achieving Superior Energy Storage Properties of All-Organic Dielectric Polystyrene-Based Composites by Blending Rod–Coil Block Copolymers

“…Recently, bilayered PS-based nanocomposite films with a high insulation interface barrier layer (Al 2 O 3 /PS) and a high ε r layer (TiO 2 /PS) were prepared via layer-by-layer solution casting by Wang et al Al 2 O 3 dispersed in a PS matrix restrained electrical conduction, while TiO 2 increased the ε r value of PS. The resulting layered film possessed a U e value of 4.43 J/cm 3 along with an ultrahigh η of >90% …”

“…The resulting layered film possessed a U e value of 4.43 J/cm 3 along with an ultrahigh η of >90%. 31 According to the literature, researchers mainly focus on the study of PS-based inorganic composites. 32 There are few reports investigating all-organic PS-based composites.…”

High energy storage density and low energy loss achieved by inserting charge traps in all organic dielectric materials

“…4 Comparison of dielectric breakdown strength and discharged energy density between this work and literature results. 10,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] This journal is © The Royal Society of Chemistry 2022 a similar tendency to that of room temperature. The phenomena agree well with the breakdown strength as discussed above.…”