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

(1 − x )Bi 0.5 Na 0.47 Li 0.03 Ti 0.99 Sn 0.01 O 3 – x SrTiO 3 (BNLST– x ST) 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 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 W D < 5%). Moreover, a fast discharge rate ( t 0.9 = 0.219 μs) and a large discharge energy density ( W D = 1.89 J/cm 3 ) are achieved at 220 kV/cm. The results show that BNLST– x ST energy storage ceramics are promising materials for devices with pulsed power capacitor.