Abstract
K0.5Na0.5NbO3 (KNN)-based ceramics are ideal alternatives to lead-containing ceramics because of their high maximum polarization and relatively large breakdown strength, however the low energy efficiency (η) remains a constraint on application. In this work, a novel (1-x)K0.5Na0.5NbO3-xBi(Ni0.5Ti0.5)O3 [(1-x)KNN-xBNiT] ceramics were designed and prepared using traditional solid state reaction method. An optimal recoverable energy storage density (Wrec) of 2.61 J/cm3 accompanied by an ultrahigh η of 82.6% was simultaneously achieved in 0.85KNN-0.15BNiT ceramic under 280 kV/cm. Furthermore, a favorable temperature and frequency stability (the variation of Wrec and < 3% over the range of 25–150 °C and 1–100 Hz) of energy storage performances (ESP) can be obtained. Meanwhile, 0.85KNN-0.15BNiT ceramic exhibits an outstanding power density (47.8 WM/cm3) and a fast discharge speed (t0.9 = 46.9 ns) under 120 kV/cm. These results reflect that 0.85KNN-0.15BNiT ceramic is a deserved candidate for the application of high energy storage devices.
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