Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi_0.5Na_0.5TiO₃-based relaxor ferroelectric ceramicsviaconstructing multiphase structures

Abstract

BNT-based ceramics with polymorphic PNRs display an ultrahigh Wrec of 7.4 J cm−3 and a high η of 89% at 400 kV cm−1, as well as excellent thermal reliability.

Ultrahigh Energy-Storage Density of BaTiO3-Based Ceramics via the Interfacial Polarization Strategy

“…This finding indicates that all samples exhibit a typical relaxor behavior. This also implies that the ferroelectric long-range ordering is broken, leading to the appearance of PNRs. − Raman spectroscopy analysis and TEM observation also support this point, as discussed above. It is well known that the relaxor behavior is usually estimated by the modified Curie–Weiss law: where ε m is the maximum value of the permittivity, T m is the corresponding temperature, γ is the diffusion coefficient, and C is the Curie constant .…”

Excellent Energy Storage Performance Achieved in Sr(Sc0.5Nb0.5)O3-Doped Bi0.5Na0.5TiO3-Based Lead-Free Relaxor Ferroelectric Ceramics

“…21 The modulated phase structure of BNT through component optimization design has become an effective strategy to improve ESP. 9,21,27,28 Dielectric ceramic materials depend on the polarization and depolarization process driven by an electric field to attain energy storage. 12 The special mechanism results in very fast charge/discharge rates.…”

Ultrahigh energy storage performance of a 0.75Bi0.47Na0.47Ba0.06TiO3-0.25CaTi0.8Sn0.2O3 ceramic under moderate electric fields

“…[10][11][12][13] To obtain a low P r and a high P m , nanodomain/domain engineering, supercritical behavior, superparaelectric relaxation states, high entropy design, defect engineering, construction of phase boundaries and enhanced antiferroelectric (AFE) phases have been explored and designed to destroy long-range ferroelectric domains to lower the polarization transition barrier. 8,[10][11][12][13][14][15][16][17] Through the synergistic combination of these strategies, a major breakthrough in energy storage performance has been achieved, with a series of ultra-high W rec values of 7.4, 8.58, 8.91, 9.55 and 15.1 J cm −3 , respectively. 5,6,12,16,17 However, due to their low polarity, these ceramics show high energy storage density only when the electric field is up to 400 kV cm −1 .…”

“…8,[10][11][12][13][14][15][16][17] Through the synergistic combination of these strategies, a major breakthrough in energy storage performance has been achieved, with a series of ultra-high W rec values of 7.4, 8.58, 8.91, 9.55 and 15.1 J cm −3 , respectively. 5,6,12,16,17 However, due to their low polarity, these ceramics show high energy storage density only when the electric field is up to 400 kV cm −1 . Therefore, it is important to increase the P max value to achieve a combination of large η and W rec at medium electric fields.…”