科研之友
微信
新浪微博
Facebook
分享链接
摘要
NaNbO3-based (NN) energy storage ceramics have been widely studied as candidate materials for capacitors due to their high breakdown field strength (E-b), large recoverable energy storage density (W-rec) and lead-free environmental friendliness. However, NN energy storage ceramics still face the problem of high energy loss (W-loss) at high field strength, so reducing the W-loss to increase energy storage efficiency (eta) has become an urgent problem. In the present work, (1-x)(0.93NaNbO(3)-0.07Bi(Mg0.5Zr0.5)O-3)-xCaTiO(3) (0.10 <= x <= 0.25) ternary ceramic system was designed to obtain a dielectric ceramic with large W-rec and high eta. Due to the addition of linear dielectric CaTiO3 to 0.93NaNbO(3)-0.07Bi(Mg0.5Zr0.5)O-3 ceramics, the grain size is reduced, the sintering density is increased, heterovalent ions are introduced, and the structural disorder of the system is increased to achieve high breakdown field strength (E-b) and low residual polarization strength (P-r). Ultimately, large W-rec (4.45 J/cm(3)) and high eta (85.75%) were obtained for 0.80(0.93NaNbO(3)-0.07Bi(Mg0.5Zr0.5)O-3)-0.20CaTiO(3) (referred to later as 0.20CT ceramics) ceramics at high E-b of 580 kV/cm. Besides, the 0.20CT ceramics also achieved high current density (C-D) of 726.82 A/cm(2) and power density (P-D) of 65.41 MW/cm(3) and ultra-fast charge-discharge rate (t(0.9)) of 13 ns. The ternary lead-free ceramic system introduced with CaTiO3 linear dielectric in this study provides a new idea for the future development of high energy storage lead-free capacitors.
-
单位桂林理工大学
