Fatigue resistant lead-free multilayer ceramic capacitors with ultrahigh energy density

Abstract

Electrical homogeneity is vital in optimising energy storage performance in BiFeO3–BaTiO3–xBi(Li0.5Nb0.5)O3 ceramic multilayer capacitors, giving rise to high recoverable energy density ∼13.8 J cm−3 under electric field ∼950 kV cm−1 and fatigue resistance behaviour.

Novel BaTiO3-Based, Ag/Pd-Compatible Lead-Free Relaxors with Superior Energy Storage Performance

“…The highest W rec ∼ 4.55 J cm –3 and η ∼ 90% are obtained for 0.06B 2/3 MN-BT at E max ∼ 520 kV cm –1 ( Figures 3 b and S6b, Supporting Information ), exhibiting the highest W rec values compared to all reported BT-based lead-free ceramics to date ( Figure 3 c,d). Other systems have recently shown higher W rec but this is accompanied by either poor efficiency (<70%) such as AN or cannot be co-fired with internal electrodes other than Pt, for example BF 36 compounds.…”

“… 41 Such dopant strategies are often accompanied by an increase in electrical homogeneity and reduction of grain size/porosity, leading to enhanced E max . 33 , 36 , 43 , 53 However, the role of A-site vacancies ( V A ) is rarely addressed in “active solid solutions”.…”

Enhanced energy storage density in Ca and Ta co‐doped AgNbO3 antiferroelectric ceramics

“…A combination of high saturation polarization, extreme breakdown electric field and reduced remanent polarization are critical to realize high energy storage density. In both lead‐free BiFeO 3 ‐BaTiO 3 and (0.7− x )BiFeO 3 ‐0.3BaTiO 3 ‐ x Bi(Li 0.5 Nb 0.5 )O 3 multilayers, high energy storage densities of 10.5 and 13.8 J/cm 3 combined with high efficiency were obtained respectively, which can be attributed to the extreme breakdown strength(700 and 950 kV/cm) 10,11 …”

“…In both lead-free BiFeO 3 -BaTiO 3 and (0.7−x)BiFeO 3 -0.3BaTiO 3 -xBi(Li 0.5 Nb 0.5 )O 3 multilayers, high energy storage densities of 10.5 and 13.8 J/cm 3 combined with high efficiency were obtained respectively, which can be attributed to the extreme breakdown strength(700 and 950 kV/cm). 10,11 However, due to the poor sintering abilities, expensive raw materials and low energy storage performance, pure AgNbO 3 ceramics are strictly limited in the application of capacitors. Since silver niobate was successfully synthesized by Fu et al and the typical double hysteresis loop was observed, 12 extensive efforts have been paid to AgNbO 3 -based ceramics to determine the phase structure or improve its energy storage density.…”

Characterizing oxygen atoms in perovskite and pyrochlore oxides using ADF-STEM at a resolution of a few tens of picometers

“…Ceramic oxides with perovskite (ABO3) or pyrochlore (A2B2O7) structure, where A and B are cations with very different sizes, exhibit interesting physical and electrical phenomena including magnetic [1,2], ferroelectric [3][4][5][6], dielectric [7][8][9], pyroelectric [4,10], piezoelectric [4,11] and superconducting [12,13] properties. The functionality of these oxides is often dependent on microstructural defects, in particular oxygen displacement or oxygen vacancies [14][15][16][17][18][19].…”