Giant comprehensive capacitive energy storage in lead-free quasi-linear relaxor ferroelectrics via local heterogeneous polarization configuration

Abstract

Dielectric ceramic capacitors have shown extraordinary promise for physical energy storage in electrical and electronic devices, but the major challenge of simultaneously achieving high recoverable energy density (Wrec), ultrahigh efficiency...

Structurally Regulated Design Strategy of Bi0.5Na0.5TiO3-Based Ceramics for High Energy-Storage Performance at a Low Electric Field

“…The comprehensive energy-storage characteristic of 0.96 (0.7BNT-0.3ST)-0.04 SZN is superior to those of the reported BNT-based ceramics ,− with an excellent energy-storage performance at a low electric field of 290 kV/cm. Figure a shows that the W rec of 0.96 (0.7BNT-0.3ST)-0.04 SZN is higher than those of the reported lead-free energy-storage ceramics under similar electric fields (280–310 kV/cm). ,,− The reported W rec values of lead-free ceramics can reach up to 7–8 J/cm 3 under an applied electric field strength of >400 kV/cm (Figure b). − However, the W rec values of 0.96 (0.7BNT-0.3ST)-0.04 SZN reach 7.43 ± 0.05 J/cm 3 under an electric field strength of 290 kV/cm. Moreover, 0.96 (0.7BNT-0.3ST)-0.04 SZN has excellent temperature and frequency energy-storage stability and good charge–discharge properties ( P D ∼ 74 ± 1 MW/cm 3 and τ 0.9 ∼ 159 ± 2 ns) (Figures S2 and S4).…”

“…(a) Comparison of W rec under similar electric fields strength (280–310 kV/cm) ,,− and (b) electric field strength required for similar W rec (7–8 J/cm 3 ) values for 0.96 (0.7BNT-0.3ST)-0.04 SZN ceramic and reported lead-free energy-storage ceramics. − …”

High-entropy superparaelectrics with locally diverse ferroic distortion for high-capacitive energy storage

“…The high E b is also associated with entropy-induced lattice distortion, ultra ne grains (G a ), clear and dense grain boundaries, wide bandgaps (E g ), and ultralow dielectric loss (tanδ) (Supplementary Fig. 6) 45 . We further used the nite element method to simulate the breakdown paths, potential and electric eld distributions of SLTT-0 and SLTT-0.30 samples under applied electric elds, respectively.…”