High energy storage performance of Na(Nb0.95Ta0.05)O3/Na0.5Bi0.5TiO3 lead-free ferroelectric ceramics

NaNbO3-based lead-free ferroelectric ceramics are considered to be one of the most promising energy storage materials. In this paper, The (1-x)Na(Nb0.95Ta0.05)O-3-x(Bi0.5Na0.5)Ti-O3 ceramics have been investigated in detail. The SEM images presented that the addition of BNT obviously improved the bulk densities which reached a maximum at x = 0.4, corresponding to a high breakdown field strength of 240 kV/cm. The XRD patterns showed that the strongest diffraction peak was observed in the case of x = 0.4 and 2 theta = 33.2, implying that the two phases formed a superior mutual solubility, because of which a significant polarization intensity of 38.2 mu C/cm(2) was obtained. As a result, the 0.6NaNbO(3)-0.4(Bi0.5Na(0.5))TiO3 ceramics exhibited an excellent discharge energy density of 3.607 J/cm(3), while the energy storage efficiency was calculated to be 72%.

Automated summary

This paper investigates the effect of adding BNT on the performance of NaNbO3-based ferroelectric ceramics, and finds that the addition of BNT significantly improves the bulk density and breakdown field strength of the material. The two phases also exhibit good mutual solubility, resulting in high polarization intensity and excellent energy storage performance.