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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Enhanced dielectric performance of BaTiO3/PVDF composites prepared by modified process for energy storage applications
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Enhanced dielectric performance of BaTiO3/PVDF composites prepared by modified process for energy storage applications

机译：改性工艺制备的BaTiO 3 / PVDF复合材料的介电性能增强

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摘要

Ceramic-polymer composites have attracted extensive attention in electrical applications due to their high permittivity and low loss. In this work, we report the studies on the preparation and properties of barium titanate (BT)/ poly(vinylidenefluoride) (PVDF) composite thin films. The composite film was prepared by a modified process rather than the conventional method. The modified process adopted ballmilling technique instead of the stirring method to disperse BT nanoparticles into PVDF solution. Scanning electron microscopy images of the obtained composites show that the BT nanoparticles are incorporated into the PVDF network and are well dispersed in the matrix. When the BT volume fraction is 30%, the permittivity and breakdown strength of the composites reach their optimal values and the energy density reaches maximum value (5.3 J/cm3), an increase of 80% compared with that of the composites prepared using the stirring method. Another modification is the use of acetone and butanone mixed solution instead of N,N-dimethylformamide to dissolve the PVDF, which is beneficial to form pure ??-PVDF composite films on the polyethylene terephthalate substrate by tape casting. The composites prepared by the modified process, with high permittivity and significantly enhanced breakdown strength, are useful candidates for energy storage applications.
机译：陶瓷-聚合物复合材料由于其高介电常数和低损耗而在电气应用中引起了广泛关注。在这项工作中，我们报告了钛酸钡（BT）/聚偏二氟乙烯（PVDF）复合薄膜的制备和性能研究。通过改进的方法而不是常规方法来制备复合膜。改进后的工艺采用球磨技术代替搅拌法将BT纳米颗粒分散到PVDF溶液中。所获得的复合材料的扫描电子显微镜图像显示，BT纳米颗粒被掺入到PVDF网络中并很好地分散在基质中。当BT体积分数为30％时，复合材料的介电常数和击穿强度达到最佳值，能量密度达到最大值（5.3 J / cm3），与使用搅拌法制备的复合材料相比，增加了80％方法。另一种改进是使用丙酮和丁酮混合溶液代替N，N-二甲基甲酰胺溶解PVDF，这有利于通过流延在聚对苯二甲酸乙二醇酯基底上形成纯的Δε-PVDF复合膜。通过改进的工艺制备的复合材料具有高介电常数和明显增强的击穿强度，是用于储能应用的有用候选材料。

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