Achieving Enhanced Energy‐Storage Performances in Bi_0.5(K_0.15Na_0.85)_0.5TiO₃ Ceramics Modified by Sr(Ti_0.85Zr_0.15)O₃

Abstract

Lead‐free (1−x)Bi0.5(K0.15Na0.85)0.5TiO3‐xSr(Ti0.85Zr0.15)O3 ((1−x)BKNT‐xSTZ, x = 0.1–0.4) ceramics are synthesized by citrate combustion method. The grain size is reduced, and the high‐temperature shoulder dielectric peak (Tm) shifts toward low temperature, while the low‐temperature shoulder dielectric peak (Ts) shifts toward high temperature as x increases. The remnant polarization decreases and slimmer hysteresis loops are realized with x increasing. The optimal energy density (Wre ≈2.85 J cm−3) with high efficiency (η ≈ 81%) is obtained for 0.7BKNT‐0.3STZ at 160 kV cm−1. More importantly, excellent frequency stability and enhanced temperature‐dependent energy properties (Wre ≈ 1.12 J cm−3 and η ≈ 94%) of 0.7BKNT‐0.3STZ ceramic are obtained at 100 kV cm−1 and 120 °C.

Enhanced Energy Storage Properties of Bi(Mg0.5Zr0.5)O3 Modified Ba0.9Sr0.1TiO3 Ceramics

“…Lots of methods have been adopted to improve the energy storage properties, such as ions doping, [11][12][13][14][15] optimizing process, [16][17][18] and the introduction of liner additive. [19][20][21][22] Very recently, different liner additives have been introduced to form solid solutions. Such as BaTiO 3 -based ceramics modified by Bi(Mg 1/2 Zr 1/2 )O 3 show optimal W re of 1.25 J cm −3 and 𝜂 of >95%.…”