SrTiO3‐modified Bi0.5Na0.47Li0.03Ti0.99Sn0.01O3 relaxor ferroelectric ceramics with high energy storage performance.

(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. [ABSTRACT FROM AUTHOR]