Temperature‐stable dielectric and energy storage properties of La(Ti_0.5Mg_0.5)O₃‐doped (Bi_0.5Na_0.5)TiO₃‐(Sr_0.7Bi_0.2)TiO₃ lead‐free ceramics

Abstract

A new type of (0.7−x)Bi0.5Na0.5TiO3‐0.3Sr0.7Bi0.2TiO3‐xLaTi0.5Mg0.5O3 (LTM1000x, x = 0.0, 0.005, 0.01, 0.03, 0.05 wt%) lead‐free energy storage ceramic material was prepared by a combining ternary perovskite compounds, and the phase transition, dielectric, and energy storage characteristics were analyzed. It was found that the ceramic materials can achieve a stable dielectric property with a large dielectric constant in a wide temperature range with proper doping. The dielectric constant was stable at 2170 ± 15% in the temperature range of 35‐363°C at LTM05. In addition, the storage energy density was greatly improved to 1.32 J/cm3 with a high‐energy storage efficiency of 75% at the composition. More importantly, the energy storage density exhibited good temperature stability in the measurement range, which was maintained within 5% in the temperature range of 30‐110°C. Particularly, LTM05 show excellent fatigue resistance within 106 fatigue cycles. The results show that the ceramic material is a promising material for temperature‐stable energy storage.

Outstanding Energy Storage Performance of NBT-Based Ceramics under Moderate Electric Field Achieved via Antiferroelectric Engineering

“…The intersection of the semicircle with the horizontal coordinates at low frequencies is the ceramic impedance. 62,63 As the ACN content increases, the impedance of the ceramic is effectively increased, and the insulation is optimized. This point is illustrated by the Arrhenius plots, i.e., the frequency at the maximum impedance (f max ) as a function of temperature: 64…”

“…Figure a–d shows the complex impedance plots of the (NBT-SBT)- x ACN ceramics at different temperatures ranging from 550 to 650 °C. The intersection of the semicircle with the horizontal coordinates at low frequencies is the ceramic impedance. , As the ACN content increases, the impedance of the ceramic is effectively increased, and the insulation is optimized. This point is illustrated by the Arrhenius plots, i.e., the frequency at the maximum impedance ( f max ) as a function of temperature: f max = f 0 exp ( − E a / k B T P ) where f 0 is the pre-exponential factor, E a is the activation energy, and k B is the Boltzmann constant.…”

High energy storage density and efficiency with excellent temperature and frequency stabilities under low operating field achieved in Ag0.91Sm0.03NbO3-modified Na0.5Bi0.5TiO3-BaTiO3 ceramics

“…To fully illustrate the superior energy storage performances of the 0.85NBT-0.06BT-0.09ASN ceramic, comparison of W rec ~ ƞ between 0.85NBT-0.06BT-0.09ASN ceramic and the above lead-free ceramics is shown in Fig. 8b [12,15,29,43,56,71,[76][77][78][79][80][81][82][83][84][85][86][87]. It is obvious that the 0.85NBT-0.06BT-0.09ASN ceramic simultaneously exhibits high W rec and ƞ as relative to most of the lead-free energy storage ceramics.…”

Enhanced energy‐storage properties in Zr4+‐modified (Bi0.4Ba0.2K0.2Na0.2)TiO3 high‐entropy ceramics

“…Figure 12 compares the energy storage performance of (Bi 0.4 Ba 0.2 K 0.2 Na 0.2 )(Zr 0.2 Ti 0.8 )O 3 and several other (Bi 0.5 Na 0.5 )TiO 3 -based ceramics with similar breakdown electric fields (150−240 kV/cm). [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] The energy storage property of (Bi 0.4 Ba 0.2 K 0.2 Na 0.2 )(Zr 0.2 Ti 0.8 )O 3 is at a moderate level. We believe that the energy storage performance of this high-entropy perovskite oxide can be further improved by tuning the composition.…”