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Superhierarchical Inorganic/Organic Nanocomposites Exhibiting Simultaneous Ultrahigh Dielectric Energy Density and High Efficiency
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2020-11-26 , DOI: 10.1002/adfm.202007994
Bingcheng Luo 1 , Zhonghui Shen 2 , Ziming Cai 1 , Enke Tian 3 , Yuan Yao 3 , Baiwen Li 4 , Ahmed Kursumovic 5 , Judith L. MacManus‐Driscoll 5 , Longtu Li 1 , Long‐Qing Chen 6 , Xiaohui Wang 1
Affiliation  

Inorganic/organic dielectric nanocomposites have been extensively explored for energy storage applications for their ease of processing, flexibility, and low cost. However, achieving simultaneous high energy density and high efficiency under practically workable electric fields has been a long‐standing challenge. Guided by first‐principles calculations of interface properties and phase‐field simulations of the dynamic dielectric breakdown process, superhierarchical nanocomposites of ferroelectric perovskites, layered aluminosilicate nanosheets, and an organic polymer matrix are designed and simultaneous high energy density of 20 J cm−3 and high efficiency of 84% at a low electric field of 510 MV m−1 are achieved. This is the highest energy density of all the state‐of‐the‐art dielectric polymer nanocomposites with energy efficiency > 80% at a low electric field of <600 MV m−1. Strong atomic hybridization, large ionic displacement, the enhanced breakdown strength through forming charge‐blocking layers, and the superhierarchical microstructure with gradient interfaces are responsible for the high performances. This superhierarchical structuring modulation strategy is generally applicable to composites for different functionalities and applications.

中文翻译:

同时呈现超高介电能量密度和高效率的超等级无机/有机纳米复合材料

无机/有机介电纳米复合材料因其易于加工,灵活性和低成本而在能量存储应用中得到了广泛的研究。然而,在实际可行的电场下同时实现高能量密度和高效率一直是一项长期的挑战。在界面性质的第一性原理计算和动态介电击穿过程的相场模拟的指导下,设计了铁电钙钛矿,层状硅铝酸盐纳米片和有机聚合物基体的超分层纳米复合材料,并同时实现了20 J cm -3的高能量密度和在510 MV m -1的低电场下84%的高效率实现。这是所有最先进的介电聚合物纳米复合材料的最高能量密度,在<600 MV m -1的低电场下能效> 80%。强大的原子杂化,较大的离子位移,通过形成电荷阻挡层而增强的击穿强度以及具有梯度界面的超分层微结构是高性能的原因。这种超层次结构调制策略通常适用于具有不同功能和应用程序的复合材料。
更新日期:2020-11-26
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