High energy density in silver niobate ceramics

Abstract

Solid-state dielectric energy storage is the most attractive and feasible way to store and release high power energy compared to chemical batteries and electrochemical super-capacitors.

Antiferroelectric‐ferroelectric phase transition in lead‐free AgNbO3 ceramics for energy storage applications

“…It should be noted that the complex ionic displacement and octahedral tilting within the lattice bring great challenges for a detailed structure characterization. Especially, the Pmc2 1 space group for M 1 phase originates from a slight distortion of the parent AFE structure, which is hard to be detected by neutron or X‐ray diffraction, leading to a longstanding debate over the precise structure of AgNbO 3 …”

“…However, it is a challenge to fabricate pure AgNbO 3 ceramics with high breakdown strength because pores and impurities cannot be eliminated during the sintering process while the raw material Ag 2 O tends to decompose at elevated temperature of 200°C . In 2016, breakthrough was reported in AgNbO 3 ‐based ceramics where recoverable energy densities of 2.1 and 2.5 J/cm 3 were achieved in pure and MnO 2 ‐doped AgNbO 3 ceramics . By further modification with Bi 2 O 3 , Ta 2 O 5 and WO 3 dopants, the energy density as well as thermal stability of AgNbO 3 ‐based ceramics have been greatly enhanced, demonstrating that the AgNbO 3 ‐based ceramics are promising for energy storage applications.…”

Perovskite Srx(Bi1−xNa0.97−xLi0.03)0.5TiO3 ceramics with polar nano regions for high power energy storage

“…In comparison, bulk ceramics capacitors are more compatible with low cost and large scale manufacturing processes. In addition, bulk ceramics offer much larger effective volume and much wider working temperature range for energy storage [16].…”

Grain boundary engineering that induces ultrahigh permittivity and decreased dielectric loss in CdCu3Ti4O12 ceramics

“…Moreover, the average grain size was estimated by statistically analyzing the grain sizes in the SEM image, and the analysis was carried out using SEM image analysis software (Nano Measurer System, 1.2.5). The density of the samples was detected using the drainage method with the Archimedes principle . The silver electrodes for characterization of electrical property were prepared by covering the top and bottom of polished CdCu 3− x Zn x Ti 4 O 12 ceramics with silver paint and heating them at 840°C for 0.5 hour.…”

“…The search for ultrahigh permittivity ( ε r > 10 3 ) materials is one of the most popular research topics in the fields of microelectronics and energy storage devices . CaCu 3 Ti 4 O 12 (CCTO), a typical ACu 3 Ti 4 O 12 (ACTO, where A = Ca, Cd, La 2/3 , Y 2/3 , Bi 2/3 , Na 1/2 La 1/2 , Na 1/2 Y 1/2 , or Na 1/2 Bi 1/2 , for example) ceramic, has been widely studied due to its ultrahigh dielectric permittivity and good frequency/thermal stability.…”