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

(1 - x)Bi0.5Na0.47Li0.03Ti0.99Sn0.01O3-xSrTiO(3) (BNLST-xST) lead-free ceramics were synthesized by traditional solid phase sintering. When x = 0.4, the ceramic achieves a high energy storage density W-rec of 3.78 J/cm(3) as well as a superior efficiency eta 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 degrees C) and cycling reliability (variation of W-D < 5%). Moreover, a fast discharge rate (t(0.9) = 0.219 mu s) and a large discharge energy density (W-D = 1.89 J/cm(3)) are achieved at 220 kV/cm. The results show that BNLST-xST energy storage ceramics are promising materials for devices with pulsed power capacitor.