Enhanced energy storage properties of Sr(Ti _{0. 5} Zr _{0 .5} ) O ₃ modified (Na _{0. 5} Bi _{0 .5} )

Abstract

Summary With the rapid development of electronic industry, the miniaturization and integration of components have become an irreversible development trend, which puts forward high requirements for lead‐free ceramic materials with excellent recoverable energy storage density and efficiency. In addition, it is also a great challenge to sustain excellent energy storage performance under different environmental conditions. In this work, a combined design strategy was proposed to induce polar nano regions and reduce grain size by introducing SrTi0.5Zr0.5O3 (STZ). The addition of STZ reduced the grain size to submicron level, accompanied by relaxation enhancement. The high energy storage properties (Wrec = 1.85 J/cm3, η = 65.92%) were achieved in 0.80Bi0.5Na0.5TiO3‐0.20SrTi0.5Zr0.5O3 (BNT‐STZ) ceramics at 150 kV/cm. Excellent temperature stability (40°C‐160°C) and frequency stability (1‐500 Hz) of energy storage performance have been obtained under 100 kV/cm, with the fluctuations below 8%. Importantly, A high power density of 3.64 MW/cm3 and a transitory discharge time (t0.9 ~ 0.632 μs) were achieved for 0.80BNT‐0.20STZ ceramic under 160 kV/cm. These characteristics indicate that 0.80BNT‐0.20STZ ceramic is expected to be applied in high‐power equipment. Highlights A combined design strategy was proposed to induce polar nano regions and reduce grain size by introducing STZ. 0.80BNT‐0.20STZ ceramic possesses a recoverable energy density of 1.85 J/cm3 and efficiency of 65.92%. 0.80BNT‐0.20STZ ceramic exhibits good electrical stability in wide frequency (1‐500 Hz) and temperature range (40‐160°C). A high power density (PD) of 3.64 MW/cm3 and a transitory discharge time (t0.9 ~ 0.632 μs) can be achieved.

Simultaneously enhanced energy density and discharge efficiency of (Na0.5Bi0.5)0.7Sr0.3TiO3-La1/3(Ta0.5Nb0.5)O3 lead-free energy storage ceramics via grain inhibition and dielectric peak flattening engineering

“…6,7 The inferior energy storage density ( W < 2 J cm −3 ) and unsatisfactory efficiency ( η < 90%) under low electric fields have become bottlenecks to the commercialization of lead-free ceramics. 8,9 Therefore, developing novel ceramics with excellent W rec and η simultaneously at low electric fields is essential and valuable for practical applications of lead-free ceramic materials. The polarization vs. electric field loops ( P – E ) of dielectric materials are commonly used to represent the energy storage performance (ESP), which is calculated by the formulas: 10–12 , and , where P s and P r present the saturation polarization and the remanent polarization, respectively, and E represents the external electric field.…”

“…24 Zhang et al procured good W rec (1.85 J cm −3 ) and η (65.92%) under 150 kV cm −1 by inducing polar nano regions (PNRs) and reducing the grain size. 8 Fan et al researched BaSnO 3 -doped (1 − x ) Bi 0.38 Na 0.38 Sr 0.24 TiO 3 with a W rec of 1.42 J cm −3 at 115 kV cm −1 . 25 Zhao et al introduced Sm 3+ into ((Bi 0.5 Na 0.5 ) 0.7 (Sr 0.7 Bi 0.2 ) 0.3 )TiO 3 ceramics and procured a good W rec of 1.25 J cm −3 and an η of 73% at a low electric field of 90 kV cm −1 .…”