Simultaneous enhancement of energy storage performance and thermal stability of NaNbO3-based ceramics via multi-scale modulation
Peng Nong, Dafu Zeng, Yue Pan, Qinpeng Dong, Mingzhao Xu, Wang Xiang, Jiaming Wang, Huanfu Zhou, Xu Li, Xiuli Chen
Abstract
More and more attention is being paid to the environmental friendliness of the dielectric capacitors, which have a rapid charging and discharging speed and steady operation. However, the low recoverable energy storage density (Wrec) limits the practical application of dielectric capacitors in solid-state energy storage devices. In this paper, (1–x) (0.92NaNbO3-0.08Bi(Mg0.5Ti0.5)O3)-xSrTiO3(x = 0.05, 0.10, 0.15, 0.20) energy storage ceramics were fabricated based on various strategies such as nanodomain engineering, component and grain size optimization. Thus excellent energy storage performance (Wrec ∼ 6.0 J/cm3, η ∼ 81.0%) was obtained in NN-BMT-0.15ST. SrTiO3 could enhance the internal disorder, improve the relaxation properties and increase the breakdown field strength of ceramics. Signifi-cantly domain relaxor behavior, as evidenced by Vogel-Fulcher (V-F) model, provides strong evidence for restraining early polarization saturation. In addition, Pulse charge/discharge tests have illustrated that the sample has excellent and stable charge/discharge performance (CD ∼ 1068.9 A/cm2, PD ∼ 96.1 MW/cm3, t0.9 ≈ 0.99 μs) It is concluded that there is a huge prospect of NN-BMT-0.15ST ceramics as a kind of pulsed-power-storing electronics.