High-performance lead-free bulk ceramics for electrical energy storage applications: design strategies and challenges

Abstract

Compared with fuel cells and electrochemical capacitors, dielectric capacitors are regarded as promising devices to store electrical energy for pulsed power systems due to their fast charge/discharge rates and ultrahigh...

Amelioration on energy storage performance of KNN‐based transparent ceramics by optimizing the polarization and breakdown strength

“…[1][2][3][4] Developing transparent dielectric pulse capacitors with high energy storage performance was very important for the miniaturization and integration requirements of electronic equipment. [5][6][7][8][9] As one of the representative dielectric materials, relaxor dielectric ceramics have excellent thermal stability and mechanical properties, which are potential candidates for the transparent energy storage capacitor. [10][11][12][13][14][15][16] In order to prepare high transmittance ceramics, light scattering must be eliminated as much as possible.…”

A slush-like polar structure for high energy storage performance in a Sr0.7Bi0.2TiO3 lead-free relaxor ferroelectric thin film

“…Typically, the grain size in thin films is limited due to the restricted thickness of the film and the different growth mechanism compared with the bulk materials, which contributes to the improved E b in comparison with the corresponding bulk ceramics. The averaged grain size ( G ) and E b follow this equation: 3 E b ∝ G − a where a is a constant within the range of 0.2–0.4. Clearly, the decrease of the grain size can contribute to the increase of E b .…”

“…Dielectric materials as electrostatic capacitors have received extensive attention for potential applications in advanced electrical and electronic systems, such as electric vehicles, advanced pulsed power systems and so on, which originates from the practicability of their high-power densities with ultrafast charge/discharge rate, superior thermal and mechanical stability and high voltage endurance. [1][2][3] However, the energy storage densities of dielectric capacitors are relatively low, which has stimulated substantial efforts to seek possible approaches to improve the energy capability of the dielectric capacitors with functional integration and miniaturization. [4][5][6] In the last few decades, relaxor ferroelectric (RFE) thin lm dielectrics have been demonstrated to exhibit both high energy efficiency and a large breakdown strength due to the delayed polarization switching under an electric eld, showing superior energy storage performance compared to the ferroelectrics and linear dielectrics.…”

“…Dielectric materials as electrostatic capacitors have received extensive attention for potential applications in advanced electrical and electronic systems, such as electric vehicles, advanced pulsed power systems and so on, which originates from the practicability of their high-power densities with ultrafast charge/discharge rate, superior thermal and mechanical stability and high voltage endurance. 1–3 However, the energy storage densities of dielectric capacitors are relatively low, which has stimulated substantial efforts to seek possible approaches to improve the energy capability of the dielectric capacitors with functional integration and miniaturization. 4–6…”

Enhanced Energy Storage Properties of La-Doped Sr0.6Ba0.4Nb2O6 Relaxor Ferroelectric Ceramics Prepared by Spark Plasma Sintering

“…There are four main categories of dielectric energy materials, including linear dielectrics, ferroelectrics (FE), relaxor ferroelectrics (RFE) and antiferroelectrics (AFE). Among them, ferroelectric and antiferroelectric ceramics exhibit great potential in energy-storage fields due to small residue polarization P r [5][6][7]. However, most antiferroelectrics with excellent properties contain lead, which would cause serious environment problems.…”