High energy storage density with ultra-high efficiency and fast charging–discharging capability of sodium bismuth niobate lead-free ceramics

Abstract

Ceramics-based capacitors with excellent energy storage characteristics, fast charging/discharge rate, and high efficiency have received significant attention. In this work, Na[Formula: see text]Bi[Formula: see text]NbO3(NBN) ceramics were processed through solid-state sintering route. The investigated ceramics were crystallized in a single perovskite phase. Dense microstructure, with small average grain size ([Formula: see text]0.92 [Formula: see text]m) is obtained for the investigated ceramics. A high dielectric constant >1000 accompanied by a low dielectric loss was achieved for these ceramics at ambient temperature. A recoverable energy density [Formula: see text]0.92 J/cm3and ultra-high efficiency of 96.33% at 138 kV/cm were obtained at room temperature. Furthermore, a lower discharging time of 0.14 [Formula: see text]s was also achieved. This material is a suitable candidate for power pulsed applications.

Superior High‐Temperature Energy Density in Molecular Semiconductor/Polymer All‐Organic Composites

“…Dielectric polymers are extensively used in consumer electronics, hybrid electric vehicles, new energy grid connections, and aerospace, to name a few, because of their high breakdown strength (BDS), low dielectric loss (tanδ), and good flexibility. [1][2][3][4][5] Compared to dielectric ceramics, [6][7][8][9] however, dielectric polymers still have the drawbacks of low dielectric constant (ε r ) and poor energy storage performance at high temperatures. The biaxially oriented polypropylene (BOPP) high-temperature dielectric polymers possess good thermal stability with high T g , they perform poorly in certain practical situations where high electric fields and high temperatures are applied simultaneously.…”

High-performance energy-storage ferroelectric multilayer ceramic capacitors via nano-micro engineering

“…8a. 14,62 The W dis increases from 0.03 J cm −3 at 50 kV cm −1 to 2.0 J cm −3 at 600 kV cm −1 (Fig. 8b).…”

High-Energy Storage Properties over a Broad Temperature Range in La-Modified BNT-Based Lead-Free Ceramics

“…The global increase in energy consumption and numerous environmental problems have raised scientific awareness of the importance of efficient and clean energy storage devices. , Nowadays, electrical energy storage devices, including dielectric capacitors, batteries, and supercapacitors, have attracted great attention in the field of pulse capacitors and hybrid vehicles due to their high charge/discharge rate and high power density. Among various inorganic dielectrics used for capacitors, dielectric ceramics offer the advantages mentioned above, making these materials promising for energy storage applications. − The energy storage density and efficiency of dielectric ceramics can be calculated from where W tot , W rec , and η represent the total energy storage density, the recoverable energy storage density, and the energy storage efficiency, respectively, P r and P max are the remnant polarization and the maximum polarization under the applied electric field ( E ), respectively. , W rec can be determined from the shaded area in the P – E hysteresis loop, as shown in Figure . Equation indicates that achieving high energy storage density depends on Δ P ( P max – P r ) and breakdown strength (BDS).…”