Significantly enhanced energy storage density of sandwich-structured (Na0.5Bi0.5)0.93Ba0.07TiO3/P(VDF-HFP) composites induced by PVP-modified two-dimensional platelets
Significantly enhanced energy storage density of sandwich-structured (Na0.5Bi0.5)0.93Ba0.07TiO3/P(VDF-HFP) composites induced by PVP-modified two-dimensional platelets
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DOI：
10.1039/c6ta06682h
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Abrahams, Isaac
中科院分区：
文献类型：
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作者：
Jiang, Chao;Zhang, Dou;Abrahams, Isaac
二维（NA0.5BI0.5）（0.93）BA0.07TIO3（NBBT）血小板，大小高达Ca。将5 mu m和0.2-0.5 mu m的厚度引入填充剂中，以首次准备储能复合材料。将NBBT血小板用H2O2的水溶液处理，并用聚乙烯吡咯烷酮（PVP）涂覆，然后与聚乙烯基 - 氟化二氟二氟丙烯）混合（p（VDF-HFP））。最终的复合材料表示为NBBT@PVP/P（VDF-HFP）。用NBBT@PVP载荷从1到30 Vol％制备复合材料。随着NBBT@PVP加载的增加，复合材料的相对介电常数显着增加，而分解强度降低。为了提高复合材料的分解强度，开发了多层膜的三明治结构，该结构使用了NBBT@PVP/P（VDF-HFP）复合材料，其中包括1 vol％NBBT载荷作为中央硬层，并带有30 Vol％NBBT负载作为相邻的软层。这部五层膜包含三个中央硬层和相邻的软层，显示出极好的能源存储特性。薄膜的分解强度和最大能量存储密度分别达到258 kV mm（-1）和14.95 J CM（-3）。在200 kV mm（-1）的电场上，能源效率保持0.9。这些发现提供了一种新的方法来生产具有高性能的储能材料。
Two-dimensional (Na0.5Bi0.5)(0.93)Ba0.07TiO3 (NBBT) platelets with a size of up to ca. 5 mu m and thickness of 0.2-0.5 mu m were introduced as fillers into a polymer matrix to prepare energy storage composites for the first time. The NBBT platelets were treated with an aqueous solution of H2O2 and coated with polyvinylpyrrolidone (PVP) before mixing with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)). The final composite was denoted as NBBT@PVP/P(VDF-HFP). Composites were prepared with NBBT@PVP loadings from 1 to 30 vol%. The relative permittivity of the composites increased significantly with increasing NBBT@PVP loading, while the breakdown strength decreased. To improve the breakdown strength of the composites, a sandwich-structure of multilayer films was developed, which used NBBT@PVP/P(VDF-HFP) composites with 1 vol% NBBT loadings as central hard layers and the composites with 30 vol% NBBT loadings as neighboring soft layers. The five-layered film, which contained three central hard layers and neighboring soft layers, showed excellent energy storage properties. The breakdown strength and the maximum energy storage density of the film reached 258 kV mm(-1) and 14.95 J cm(-3), respectively. The energy efficiency remained 0.9 at an electric field of 200 kV mm(-1). The findings provide a new approach to produce energy storage materials with high performance.