Energy storage performance of SrSc <sub>0.5</sub> Nb <sub>0.5</sub> O <sub>3</sub> modified (Bi,Na)TiO <sub>3</sub> ‐based ceramic under low electric fields
Zhonghua Dai, Shengbin Wang, Yong Liu, Fanbo Zhang, Weiguo Liu, Xin Zhao, Xiangdong Ding, Minxia Fang, Xiaobing Ren
Abstract
Abstract Dielectric ceramics with a high recoverable energy density ( W rec ) and high efficiency are desirable for the development of pulsed power capacitors under low electric fields. In this study, through the introduction of SrSc 0.5 Nb 0.5 O 3 into (Bi 0.5 Na 0.5 Ti 0.95 Al 0.025 Nb 0.025 O 3 ) [(1‐ x )BNTA‐ x SSN], a considerable recoverable energy storage density ( W rec ) of approximately 2.7 J/cm 3 and energy storage efficiency ( η ) of approximately 76 % at 210 kV/cm are achieved at x = .1; additionally, η is further improved to 85 % at x = .2. Moreover, η and W rec of .9BNTA‐.1SSN exhibit outstanding stability (thermal and frequency stability) at 150 kV/cm, which is superior to that of other lead‐free ceramics. The excellent energy storage performance is attributed to the increased relaxation degree and the formation of ferroelectric nanodomains, whereas the enhanced E b is ascribed to the increased electrical resistivity and decreased grain size upon modification. These results indicate the potential of (1‐ x )BNTA‐ x SSN as an ideal candidate for energy‐storage applications.