Abstract
Dielectric capacitors have attracted much attention due to fast charge–discharge and superior energy storage capacity. For practical applications, pulsed power capacitors depend on not only large energy density but also excellent energy efficiency, which are very hard to obtain simultaneously. In this work, ultrahigh energy storage density (Wrec) of 2.485 J/cm3 and energy storage efficiency (η) of 96.2% are achieved simultaneously in (1 − x)BaTiO3 − xBi(Ni0.5Zr0.5)O3 (xBNZ) (x = 0.16) relaxor ferroelectric ceramics. The meaningfully improved Wrec was obviously better than that of most the other unleaded ceramics. Meanwhile, the microstructures, dielectric properties and energy storage behaviors of the xBNZ ceramics were systematically investigated. In addition, decent temperature and frequency stability (variation of Wrec < 12% over 25–100 ℃ and Wrec < 0.2% in 1–100 Hz) can be obtained in this system. These results illustrate that 0.16BNZ ceramic can be a promising unleaded material for advanced energy storage devices.
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