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

Abstract

Transparent ceramic capacitors have broad application prospects in electronic devices due to their excellent optical transparency and energy storage properties. However, the low polarizability and high remnant polarization of the existing transparent dielectric ceramics limit the promotion of energy storage performance. Here, Bi(Li 0.5 Nb 0.5 )O 3 (BLN) was chosen to modify the (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics to optimize the optical transmittance and energy storage characteristics simultaneously. On the one hand, the grain growth is inhibited, contributing to the improved breakdown strength and transmittance. On the other hand, the doping BLN could reduce the polar nanoregions size, which makes them respond more quickly to the external electric field and, thus, improves the energy storage efficiency. As a consequence, 0.95KNN-0.05BLN ceramic possesses the excellent W rec of 4.39 J/cm 3 , η of 81.4%, and transparency of 77.9% with an average grain size of ∼109 nm. This work opens up a paradigm to develop a transparent pulse capacitor.

Synergistic modulation of ferroelectric polarization and relaxor behavior of Sr2NaNb5O15‐based tungsten bronze ceramic

“…An excellent W rec of 4.08 J/cm 3 and a high η of 84.59% are attained at 420 kV/cm simultaneously. A comparison of the ESP acquired in the SBNNT‐0.15 ceramic with that recently reported in other dielectric ceramics is exhibited in Figure 6(D) 12,13,27,42–66 . It is worth noting that the ESP obtained in this work has exceeded that of other assessed TB‐based ceramics and can be comparable to some recently assessed perovskite structural ceramics due to synergistic modulation of ferroelectric polarization and relaxor behavior, indicating that the SBNNT‐0.15 ceramic has great potentials in the field of energy storage.…”

Superior Energy Storage Properties and Optical Transparency in K0.5Na0.5NbO3‐Based Dielectric Ceramics via Multiple Synergistic Strategies

“…This proves that excellent energy storage properties and high optical transparency were simultaneously achieved in the 0.94KNN-0.06SLZ sample, which outperformed other KNN-based transparent ceramics, as shown in Figure 5c. [7][8][9][10][11][12][13][14][15][16][17] It is noteworthy that the demand for component transparency in energy storage devices is expected to potentially increase owing to its increasing popularity in advanced electronic devices.…”

“…[4][5][6] However, despite extensive efforts dedicated to the optimization of energy storage in transparent ceramics, their inferior recoverable energy density and efficiency hinder their miniaturization and integration with advanced energy storage and conversion systems. [7][8][9][10][11][12][13][14][15][16][17] Therefore, it is important to improve the energy storage ability of transparent ceramics. [18][19][20][21] The energy storage density and efficiency of transparent ceramics are generally obtained from the P-E hysteresis loop.…”

“…[27] Interestingly, both LaBiO 3 and SrTiO 3 effectively refined the grain size of KNN crystals, thereby providing a helpful reference for developing KNN-based transparent materials with outstanding energy storage properties. Subsequently, numerous researchers analyzed the energy storage performance of KNN-based transparent ceramics [9][10][11][12][13][14][15][16][17] , while it was observed that the optical transmittance and comprehensive energy storage properties of the reported materials were unsatisfactory. It was also observed that the barrier between high W rec and η in KNN-based transparent ceramics has not been overcome.…”

Regulating Ni3+ contents by a cobalt doping strategy in ternary NixCo3−xAl1-LDH nanoflowers for high-performance charge storage

“…Researchers have proved that supercapacitors with high power density are destined to show extraordinary talent as an excellent clean energy storage device. 2 As a fast charging-discharging equipment with high power and energy density, supercapacitors still lack sufficient feasible electrode materials to make them popular.…”