LAUSR

The development of Pb-free energy-storage materials with excellent stability has attracted attention in recent times due to the energy and environmental crises. In this study, a series of (1 − x)BaTiO3–xBi(Ni2/3Ta1/3)O3 [(1 − x)BT–xBNT, x = 0.08, 0.1, 0.12, 0.14, and 0.16] relaxor ferroelectric ceramics was designed and synthesized. A highly recoverable energy-storage density (Wrec) of 2.63 J/cm3 and energy-storage efficiency (η) of 90% are obtained simultaneously in 0.84BT–0.16BNT ceramics. This excellent energy-storage characteristic may be attributed to the enhanced relaxor characteristic and its dense microstructure. In addition, excellent stability of energy-storage properties (variation in the Wrec < 4% over 20–100 °C, Wrec < 13.1% over 1 to 200 Hz and Wrec < 3% after 104 cycles) can also be observed. These results indicate that the 0.84BT–0.16BNT ceramics can be considered as potential Pb-free candidate materials for applications in advanced energy-storage applications.