SrTiO₃‐modified Bi_0.5Na_0.47Li_0.03Ti_0.99Sn_0.01O₃ relaxor ferroelectric ceramics with high energy storage performance

Abstract

(1 − x)Bi0.5Na0.47Li0.03Ti0.99Sn0.01O3–xSrTiO3 (BNLST–xST) lead‐free ceramics were synthesized by traditional solid phase sintering. When x = 0.4, the ceramic achieves a high energy storage density Wrec of 3.78 J/cm3 as well as a superior efficiency η of 90.3% under 360 kV/cm. The charge–discharge curves related to temperature and cycle show that the 0.6BNLST–0.4ST sample has good temperature stability (20–180°C) and cycling reliability (variation of WD < 5%). Moreover, a fast discharge rate (t0.9 = 0.219 μs) and a large discharge energy density (WD = 1.89 J/cm3) are achieved at 220 kV/cm. The results show that BNLST–xST energy storage ceramics are promising materials for devices with pulsed power capacitor.

Achieving High Energy Storage Performance under a Low Electric Field in KNbO3-Doped BNT-Based Ceramics

“…During high-temperature sintering, some of the Ti 4+ are transformed into Ti 3+ , which leads to an increase in oxygen vacancies. When Sn 4+ replaces Ti 4+ , because the ionic radius of Sn 4+ (0.69 Å) is large with Ti 4+ (0.61 Å), which prevents the passage of two neighboring Ti ions . The ionic transition distance increases, so the doping of Sn 4+ can suppress the number of oxygen vacancies. , Li + and Sn 4+ were used to modify the BNT as the matrix ceramic.…”

Energy‐storage properties of (0.7Bi0.65Na0.35Fe0.3Ti0.7O3–0.3Sr0.85Bi0.1TiO3)–NaTaO3 relaxor under low electric fields

“…To improve W rec and η of NBT-based ceramics, researchers generally start with the compositional design to transform NBT to an ergodic relaxation state. Lu et al 11 introduced SrTiO 3 (ST) to NBT and obtained a W rec of 3.78 J/cm 3 at 360 kV/cm 3 in 0.6 Bi 0.5 Na 0.47 Li 0.03 Ti 0.99 Sn 0.01 O 3 -0.4ST ceramics, but the high working electric field will bring safety risks or even physical injury in practical applications and greatly increases the cost of insulation technology. 12 On the contrary, under low electric fields, ferroelectrics usually fail to reach saturated polarization, resulting in small P max and weak energy-storage properties.…”