Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou510006, China.
Institute of Semiconductors, Guangdong Academy of Sciences, Guangzhou510650, China.
ACS Appl Mater Interfaces. 2022 Dec 7;14(48):53690-53701. doi: 10.1021/acsami.2c14234. Epub 2022 Nov 20.
BiFeO-BaTiO (BF-BT) dielectric ceramics are receiving more and more concern for advanced energy storage devices owing to their excellent ferroelectric properties and environmental sustainability. However, the energy density and efficiency are limited in spite of the large remanent polarization. Herein, we proposed a multiscale optimization strategy via a local compositional disorder with a Birich content and nanodomain engineering by introducing the SrBiCaTiO (SBCT) into BF-BT ceramics. Interestingly, an extraordinary energy storage property (ESP) with a high reversible energy storage density () of ∼3.79 J/cm and an ultrahigh polarization discrepancy (Δ) of ∼58.5 μC/cm were obtained in the SBCT-modified BF-BT ceramics under 160 kV/cm. The boosted ESP should be attributed to the fact that the replacement of A/B-sites cations could transform the long-range ferroelectric order of the BF-BT system into polar nanoregions (PNRs) along with the refined grain size, decreased leakage current, and broadened energy band gap. Moreover, good frequency (1-10 Hz) and temperature (25-125 °C) stabilities, high fatigue resistance (× 10), large power density (∼31.1 MW/cm), and fast discharge time (∼97 ns) were also observed for the optimized ceramics. These results illustrate a potentially effective method for creating high ESP lead-free ceramics at a low electric field.
基于 BiFeO-BaTiO（BF-BT）的介电陶瓷由于其优异的铁电性能和环境可持续性，在先进储能器件中受到越来越多的关注。然而，尽管剩余极化较大，但能量密度和效率仍受到限制。在此，我们通过局部组成无序和纳米畴工程提出了一种多尺度优化策略，在 BF-BT 陶瓷中引入 SrBiCaTiO（SBCT）。有趣的是，在 160 kV/cm 下，SBCT 改性 BF-BT 陶瓷中获得了非凡的储能性能（ESP），具有较高的可逆储能密度（）约为 3.79 J/cm 和超高的极化差异（Δ）约为 58.5 μC/cm。ESP 的提高归因于 A/B 位阳离子取代可以将 BF-BT 体系的长程铁电有序转变为具有细化晶粒尺寸、降低漏电流和拓宽能带隙的局域极性纳米区（PNRs）。此外，优化后的陶瓷还表现出良好的频率（1-10 Hz）和温度（25-125°C）稳定性、高疲劳抗性（×10）、大功率密度（约 31.1 MW/cm）和快速放电时间（约 97 ns）。这些结果表明，在低电场下创造高 ESP 无铅陶瓷是一种很有前途的方法。
