Lead-free ceramic-based dielectric capacitors show huge potential in electrical energy storage in pulsed power systems due to their fast charge/discharge rate, ultrahigh power density and environmental friendliness. However, unsatisfied charge/discharge performance characterized by inferior recoverable energy storage density ( generally <5 J/cm) has become a key bottleneck to restrict their applications in cutting-edge energy storage devices. In this paper, we focus on simultaneously realizing ultrahigh and efficiency () in eco-friendly BiNaTiO (BNT)-based dielectric ceramics via chemical doping. Interestingly, highly dynamic polar nanoregions (PNRs) and nanodomains are constructed by incorporating SrNdTiO (SNT) into 0.94BNT-0.06BaTiO. Of great importance, the resulting relaxor ferroelectrics (RFEs) exhibit high bulk resistivity, submicron grain size and wide band gap due to high level of SNT doping accompanying with 1 at% Nb donor doping. Therefore, excellent energy storage properties with ultrahigh ∼8.08 J/cm and ∼92.1% are achieved due to coexistence of large polarization difference (Δ=−) and giant dielectric breakdown electric field (∼540 kV/cm). Furthermore, excellent temperaturefrequency/cycling stability characterized by Δ < ±4% and Δ < ±2% ensure the energy storage applications of the studied dielectric ceramics over an enormous range of scales.

中文翻译：

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Bi0.5Na0.5TiO3基储能陶瓷通过构建动态纳米级域而具有优异的综合性能和高本征击穿强度

无铅陶瓷介电电容器由于其快速充放电速率、超高功率密度和环境友好性，在脉冲电力系统的电能存储方面显示出巨大的潜力。然而，以可恢复储能密度较差（通常<5 J/cm）为特征的充放电性能不佳已成为限制其在尖端储能器件中应用的关键瓶颈。在本文中，我们致力于通过化学掺杂同时实现环保型 BiNaTiO (BNT) 基介电陶瓷的超高效率。有趣的是，通过将 SrNdTiO (SNT) 掺入 0.94BNT-0.06BaTiO 中，构建了高动态极性纳米区域 (PNR) 和纳米域。非常重要的是，由于高水平的 SNT 掺杂和 1 at% Nb 施主掺杂，所得弛豫铁电体 (RFE) 表现出高体电阻率、亚微米晶粒尺寸和宽带隙。因此，由于大极化差（Δ=−）和巨大介电击穿电场（∼540 kV/cm）的共存，实现了超高~8.08 J/cm和~92.1%的优异储能性能。此外，出色的温度频率/循环稳定性（Δ < ±4% 和 Δ < ±2%）确保了所研究的介电陶瓷在大范围内的储能应用。