Ultrahigh energy storage performance of a 0.75Bi_0.47Na_0.47Ba_0.06TiO₃-0.25CaTi_0.8Sn_0.2O₃ ceramic under moderate electric fields

Abstract

The development of ceramic capacitors featuring high reliability and superior comprehensive performance is vital for practical applications in the medium electric field. In this work, a synergistic strategy was proposed...

Excellent Energy Storage Performance Achieved in Sr(Sc0.5Nb0.5)O3-Doped Bi0.5Na0.5TiO3-Based Lead-Free Relaxor Ferroelectric Ceramics

“…(f) Comparing values of W rec and η between ceramics x = 0, 0.20, and 0.20 (RRP). (g) Comparison of ESP parameters between this work and other lead-free ceramics. ,,,,,,,,,,,− ,− (h) Temperature-dependent (25–160 °C) and (i) frequency-dependent (1–100 Hz) P–E loops for x = 0.20 (RRP) ceramic.…”

“…Recently, many lead-free dielectric ceramic materials have been applied in energy storage systems due to their excellent thermal stability and good fatigue resistance, such as BaTiO 3 -based (BT), − NaNbO 3 -based (NN), − K 0.5 Na 0.5 NbO 3 -based (KNN), , and Bi 0.5 Na 0.5 TiO 3 -based (BNT). ,− Among them, BNT-based ceramics are considered the best candidates to replace Pb-based energy storage materials due to their high P max (>40 μC·cm –2 ) and relatively simple phase structure . According to previous reports, BNT exhibits a rhombohedral ( R , space group R 3 c ) phase structure below 255 °C, while the R phase in BNT gradually transforms into a tetragonal ( T , space group P 4 bm ) phase between 255 and 400 °C, forming a two-phase structure in which the R phase coexists with the T phase. − The R phase of BNT typically possesses high polarization, but there is a large polarization hysteresis under electric field action, causing BNT to exhibit square P – E hysteresis loops at ambient temperature. , In contrast, the T phase of BNT exhibits comparatively low polarization and high dynamic activity with small polarization hysteresis under electric field action . The modulated phase structure of BNT through component optimization design has become an effective strategy to improve ESP. ,,, …”