A new family of sodium niobate-based dielectrics for electrical energy storage applications

摘要

Although tremendous achievements have been made in enhancing recoverable energy storage density (W-rec) of lead-free dielectric ceramics for electrical energy storage applications in recent years, these ceramics with high W-rec still have two disadvantages: complex chemical composition and difficult preparation process. In this work, we selected NaNbO3 (NN)-based ceramics as base materials and used Bi2O3 as a sintering aid to reduce porosity and enhance dielectric breakdown strengths. Encouragingly, high W-rec, simple chemical composition and facile preparation process were simultaneously realized in 0.77NaNbO(3)-0.23BaTiO(3) (0.77NN-0.23BT) ceramics. A large W-rec of 1.5 J cm(-3) at 175 kV cm(-1) and excellent thermal stability (variation of W-rec < 15% over the temperature range of 20(similar to)140 degrees C) were simultaneously achieved in 0.77NN-0.23BT ceramics. More importantly, this work could bring out the development of a series of NN -based ceramics for electrical energy storage in the future such as NN-ABO(3) (A = Ca and Sr; B = Ti and Zr).