Utilizing ferrorestorable polarization in energy-storage ceramic capacitors

Abstract

A self-powered system with a long lifetime would represent an opportunity in the development of a next-generation, standalone Internet of Things. Ceramic capacitors are promising candidates for energy storage components because of their stability and fast charge/discharge capabilities. However, even the energy density of state-of-the-art capacitors needs to be increased markedly for this application. Improving the breakdown electric field represents a potential solution, but operations at such high fields relying on unchanged dielectric permittivity sacrifice the lifetime of the capacitor to some degree. Here, we report ferrorestorable polarization engineering capable of more than doubling the effective permittivity. Our experiments and ab initio calculations demonstrate that a defect dipole composed of Cu3+ and oxygen vacancy in a prototypical ferroelectric BaTiO3 ceramic is coupled with spontaneous polarization. The resultant ferrorestorable polarization delivers an extraordinarily large effective relative permittivity, beyond 7000, with a high energy efficiency up to 89%. Our work paves the way to realizing efficient ceramic capacitors for self-powered applications.

Direct observation of rotation of polarization at 90-degree domain walls in BaTiO3

“…Single crystals of V-doped BaTiO 3 were grown according to previously described methods. 51) For TEM observation, several tens of microns of crushed single crystals were glued onto copper grids, and a few nanometers of carbon coating were applied to prevent chargeup during observation and suppress domain wall motion. CBED patterns were acquired using an energy-filter transmission electron microscope (JEM-2010FEF) operated at an accelerating voltage of 100 kV and RT.…”

(Sb0.5Li0.5)TiO3-Doping Effect and Sintering Condition Tailoring in BaTiO3-Based Ceramics

“…Then, the development, storage and utilization of clean and renewable energy sources are becoming increasingly significant [2]. Among many energy storage devices, lead-free dielectric ceramics have plenty of outstanding advantages: faster charge-discharge rate, higher breakdown field strength, less expensive cost, friendly to the environment and health and a wider range of applications [3][4][5][6]. Therefore, exploring suitable lead-free dielectric ceramics to store energy provides a key to solving the problem.…”

Advancing Energy‐Storage Performance in Freestanding Ferroelectric Thin Films: Insights from Phase‐Field Simulations

“…[17] Modulating the spatial potential gradient to control the arrangement of electric dipoles is an effective way to increase W r value by causing imprint and voltage shifts in ferroelectric polarization-electric field (P-E) hysteresis loops. The introduction of spatial potential gradient is crucial, and various methods such as interfacial Schottky effect, [18,19] asymmetric charge distribution, [20] strain gradient-induced flexoelectric field, [21] and defect dipole introduction [22,23] can be utilized for this purpose.…”