电介质
纳米团簇
电容器
钛酸锶
化学
极化(电化学)
化学物理
储能
凝聚态物理
光电子学
纳米技术
电压
材料科学
电气工程
物理化学
物理
热力学
功率(物理)
有机化学
工程类
作者
Tianyu Li,Shiqing Deng,Ruixue Zhu,Jiyuan Yang,Shiqi Xu,Yongqi Dong,Hui Liu,Chuanrui Huo,Peng Gao,Zhenlin Luo,Oswaldo Diéguez,Houbing Huang,Shi Liu,Lei Chen,He Qi,Jun Chen
摘要
Dielectric capacitors are highly desired in modern electronic devices and power systems to store and recycle electric energy. However, achieving simultaneous high energy density and efficiency remains a challenge. Here, guided by theoretical and phase-field simulations, we are able to achieve a superior comprehensive property of ultrahigh efficiency of 90-94% and high energy density of 85-90 J cm-3 remarkably in strontium titanate (SrTiO3), a linear dielectric of a simple chemical composition, by manipulating local symmetry breaking through introducing Ti/O defects. Atomic-scale characterizations confirm that these Ti/O defects lead to local symmetry breaking and local lattice strains, thus leading to the formation of the isolated ultrafine polar nanoclusters with varying sizes from 2 to 8 nm. These nanoclusters account for both considerable dielectric polarization and negligible polarization hysteresis. The present study opens a new realm of designing high-performance dielectric capacitors utilizing a large family of readily available linear dielectrics with very simple chemistry.
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