Exploring novel bismuth-based materials for energy storage applications

Abstract

The increasing consumption of compact electronics impels us to design high-performance dielectric energy storage materials. Bi_0.5K_0.5TiO₃-based materials, which have been ignored thus far in energy storage applications, possess an ultrahigh stored energy density (W_S = 3.07 J cm⁻³) and recoverable energy storage density (W_R = 2.08 J cm⁻³), as well as excellent thermal stability (the variation in W_R is less than 8% over the range of 25–140 °C) when using a hot-press sintering technique. Moreover, by means of charge–discharge evaluations, the stored energy is released in a very short time (∼0.2 μs), regardless of variations in the temperature. The results presented here strongly indicate that the elaborately designed Bi_0.5K_0.5TiO₃–0.06La(Mg_0.5Ti_0.5)O₃ ceramic is a promising candidate for energy storage applications.