High‐Performance Strain of Lead‐Free Relaxor‐Ferroelectric Piezoceramics by the Morphotropic Phase Boundary Modification (Adv. Funct. Mater. 32/2022)

Abstract

Lead‐Free Piezoceramics In article number 2202307, Linglong Li, Dong Wang, and Xiaojie Lou, and co‐workers report a computationally aided composition design for discovering high‐performance lead‐free perovskite piezomaterials. The obtained bismuth sodium titanate‐based relaxor‐ferroelectric ceramic demonstrates low‐hysteresis large strains over a wide range of temperatures, which holds great promise for practical applications of actuator devices operating at room to high temperatures.

Lead‐Free Relaxor Ferroelectric Ceramics with Ultrahigh Energy Storage Densities via Polymorphic Polar Nanoregions Design

“…Among them, BNT‐based ceramics are considered to be an up‐and‐coming candidates due to their enormous polarization responses under electric field. [ 18 ] For instance, both the 0.55NBT‐0.45SBT bulk ceramics and the corresponding multilayer ceramic capacitors (MLCCs) were investigated, exhibiting large recoverable energy densities ( W rec ) of 2.5 and 9.5 J cm −3 , respectively, and accompanied by energy efficiencies (η) >90%. [ 19 ] And Yan et al.…”

“…[ 4,21 ] Aiming at this principle, the polymorphic polar nanoregions (PNRs) design strategy shown in Figure has been adopted to develop a BNT‐based ceramic dielectric with high energy storage performances. Previous studies have proved that the introduction of dopants such as Bi 0.5 K 0.5 TiO 3 , [ 22–24 ] BaTiO 3 [ 18,25,26 ] or SrTiO 3 [ 27,28 ] into BNT ceramics can construct the morphotropic phase boundary (MPB) and coexistence structures of micrometer‐size domains and polymorphic nanodomains, which effectively promoted the polarization reversal and extension owing to low energy barriers, [ 18 ] thus achieving greater electric field‐induced polarization behaviors (Figure 1b). Then the long‐range ferroelectric (FE) order of the matrix compositions was interrupted and relaxation behavior was enhanced via adding modifiers, decreasing the domain size to the nanoscale, the formation of polymorphic PNRs results in a small P r (Figure 1c).…”

Dendrite‐Free Engineering toward Efficient Zinc Storage: Recent Progress and Future Perspectives

“…Similar with the function of carbon coating layers, metal/alloy (Au, Ag, Cu, In, Sn, Sb, etc .) coating layers recently stand out as the promising modification solution to strength electron distribution and zincophilic sites, and then heterogeneous nucleation centers are exposed to guide the deposition of smaller and homogeneous Zn sheet nanoarrays on the anode surface [10,12a,18a,19a,22] . Taking the Sb coating layer as an example, the low binding energy (−0.71 eV) between Zn and Sb upgraded the interfacial interaction between the modified Zn anode and Zn 2+ ions [12a] .…”

“…borides, etc .) host Zn 2+ ions based on the insertion‐extraction mechanism within interlayer spacings or lattice tunnels [1d,8e,19a,52,53b,c] . Very recently, Wang's group fabricated a low‐intercalation‐potential Cu 7 Te 4 anode as the additional Zn‐dendrite inhibitor for a high‐capacity (216 mA h g −1 ) Zn‐ion battery with a low plateau (0.2 V vs. Zn 2+ /Zn) [19a] .…”

“…host Zn 2+ ions based on the insertion‐extraction mechanism within interlayer spacings or lattice tunnels [1d,8e,19a,52,53b,c] . Very recently, Wang's group fabricated a low‐intercalation‐potential Cu 7 Te 4 anode as the additional Zn‐dendrite inhibitor for a high‐capacity (216 mA h g −1 ) Zn‐ion battery with a low plateau (0.2 V vs. Zn 2+ /Zn) [19a] . Besides, the aqueous Cu 7 Te 4 //ZnI 2 full battery realized the energy density of 65.3 Wh kg −1 coupled with the capacity retention of 86 % after 10000 cycles.…”