Ultrahigh energy storage in superparaelectric relaxor ferroelectrics
Ultrahigh energy storage in superparaelectric relaxor ferroelectrics
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DOI：
10.1126/science.abi7687
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发表时间：
2021-10-01
期刊：
影响因子：
56.9
通讯作者：
Lin, Yuan-Hua
中科院分区：
文献类型：
--
作者：
Pan, Hao;Lan, Shun;Lin, Yuan-Hua
静电储能技术是先进电子和大功率电力系统的基础。近年来，以纳米畴为特征的弛豫型铁电体以其高能量密度和高效率而显示出巨大的应用前景。我们证明了超顺电设计的弛豫铁电薄膜的储能性能的大幅增强。纳米畴被按比例缩小到几个晶胞的极性簇，使得在保持相对高的极化的同时几乎消除了极化切换滞后。我们在超顺电钐掺杂铁酸铋钛酸钡薄膜中获得了152焦耳/立方厘米的能量密度，并显著提高了效率（在3.5兆伏/厘米的电场下>90%）。这种超顺电策略通常适用于优化弛豫铁电体的介电和其他相关功能。
Electrostatic energy storage technology based on dielectrics is fundamental to advanced electronics and high-power electrical systems. Recently, relaxor ferroelectrics characterized by nanodomains have shown great promise as dielectrics with high energy density and high efficiency. We demonstrate substantial enhancements of energy storage properties in relaxor ferroelectric films with a superparaelectric design. The nanodomains are scaled down to polar clusters of several unit cells so that polarization switching hysteresis is nearly eliminated while relatively high polarization is maintained. We achieve an ultrahigh energy density of 152 joules per cubic centimeter with markedly improved efficiency (>90% at an electric field of 3.5 megavolts per centimeter) in superparaelectric samarium-doped bismuth ferritebarium titanate films. This superparaelectric strategy is generally applicable to optimize dielectric and other related functionalities of relaxor ferroelectrics.