Mediating the confliction of polarizability and breakdown electric-field strength in BNST relaxor ferroelectric for energy storage applications
Mediating the confliction of polarizability and breakdown electric-field strength in BNST relaxor ferroelectric for energy storage applications
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调解储能应用中 BNST 弛豫铁电体的极化率和击穿电场强度的冲突
DOI：
10.1016/j.jallcom.2020.153772
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发表时间：
2020-05
影响因子：
6.2
通讯作者：
Mao Yuqing
中科院分区：
文献类型：
--
作者：
Liu Zhiyong;Zhang An;Xu Shuaichang;Lu Jinshan;Xie Bing;Guo Kun;Mao Yuqing
对于弛豫型铁电储能电容器，通常通过牺牲极化强度来提高击穿电场强度。在这项工作中，弛豫铁电体Bi0.41Na0.35Sr0.21TiO3（BNST）已被选择，目的是通过晶粒尺寸工程实现优异的储能性能。通过调整BNST弛豫铁电体的晶粒尺寸，增加了菱方相的含量，获得了中等的铁电极化和高的击穿强度。在低电场（E= 135 kV/cm）和晶粒尺寸为1.04 μm的条件下，可回收能量密度（Wrec= 2.04 J/cm 3）和能量效率（Eq = 82.4%）均得到了提高。此外，BNST陶瓷具有良好的疲劳性能，在106次循环中，Wrec的变化小于1%。晶粒尺寸工程使材料的微观结构更加致密，极化强度适中，从而大大提高了材料的介电击穿强度，是改善弛豫铁电体储能性能的有效途径。
For relaxor ferroelectric energy-storage capacitors, the breakdown electric-field strength was usually enhanced by sacrificing polarization intensity. In this work, the relaxor ferroelectric Bi0.41Na0.35Sr0.21TiO3(BNST) has been chosen with the aim to achieve excellent energy storage properties via grain size engineering. By tailoring the grain sizes of BNST relaxor ferroelectric, the fraction of rhombohedral phase was increased, and a medium ferroelectric polarization and high breakdown strength was obtained. The enhancement of energy-storage properties with large recoverable energy density (Wrec= 2.04 J/cm3) and high energy efficiency (ƞ= 82.4%) was simultaneously achieved under a low electric-field (E= 135 kV/cm) with the grain size of 1.04 μm. In addition, the BNST ceramics exhibited good fatigue properties with the variation ofWrecless than 1% over 106cycles. The grain size engineering greatly increases dielectric breakdown strength because of the denser microstructure and moderate polarization intensity, indicating that it is an effective approach to improve the energy-storage performance in relaxor ferroelectrics.
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