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Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K0.5Na0.5NbO3 Nanofibers/Poly(vinylidene fluoride) Composites
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-03-08 , DOI: 10.1002/admi.202000033 Ying Lin 1 , Chuang Sun 2 , Shili Zhan 2 , Yongjing Zhang 1 , Qibin Yuan 2
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-03-08 , DOI: 10.1002/admi.202000033 Ying Lin 1 , Chuang Sun 2 , Shili Zhan 2 , Yongjing Zhang 1 , Qibin Yuan 2
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The high discharge energy density and excellent discharge efficiency are important indicators for measuring the performance of the capacitor. This work systematically studies the sandwich structure ceramic/polymer composites in which the original poly(vinylidene fluoride) (PVDF) is used as the outer layer, and the one‐dimensional K0.5Na0.5NbO3 nanofibers and PVDF composites are used as the intermediate layer. The experimental results show that the energy storage performance of the composite films can be effectively improved by rationally designing and optimizing the filler content. The finite element simulation verifies that the sandwich structure composites mainly reduce the electric field strength of the intermediate layer by adding ceramic fibers, which hinder the growth of the electric trees. In addition, reasonable filler content and optimized structural design can significantly reduce the electrical conductivity, thereby achieving excellent discharge efficiency. In the optimized sandwich structure composites, the high energy density of 14.2 J cm−3 and excellent discharge efficiency (η = 78.5%) are achieved when the breakdown strength is 420 MV m−1. This unique sandwich structure design and high aspect ratio achieve high discharge efficiency and energy storage density provide a reference for next‐generation dielectric materials.
中文翻译：
三明治结构K0.5Na0.5NbO3纳米纤维/聚偏二氟乙烯复合材料的超高放电效率和高能量密度
高放电能量密度和出色的放电效率是测量电容器性能的重要指标。这项工作系统地研究了夹层结构陶瓷/聚合物复合材料，其中原始聚偏二氟乙烯（PVDF）被用作外层，而一维K 0.5 Na 0.5 NbO 3纳米纤维和PVDF复合材料用作中间层。实验结果表明，合理设计和优化填料含量可以有效提高复合膜的储能性能。有限元模拟验证了夹层结构复合材料主要是通过添加陶瓷纤维来降低中间层的电场强度，从而阻碍了电树的生长。此外，合理的填料含量和优化的结构设计可显着降低电导率，从而实现出色的放电效率。在优化的三明治结构复合材料中，高能量密度为14.2 J cm -3当击穿强度为420 MV m -1时，可获得极好的放电效率（η= 78.5％）。这种独特的夹层结构设计和高纵横比可实现高放电效率和能量存储密度，为下一代介电材料提供了参考。
更新日期：2020-03-08
中文翻译：
三明治结构K0.5Na0.5NbO3纳米纤维/聚偏二氟乙烯复合材料的超高放电效率和高能量密度
高放电能量密度和出色的放电效率是测量电容器性能的重要指标。这项工作系统地研究了夹层结构陶瓷/聚合物复合材料，其中原始聚偏二氟乙烯（PVDF）被用作外层，而一维K 0.5 Na 0.5 NbO 3纳米纤维和PVDF复合材料用作中间层。实验结果表明，合理设计和优化填料含量可以有效提高复合膜的储能性能。有限元模拟验证了夹层结构复合材料主要是通过添加陶瓷纤维来降低中间层的电场强度，从而阻碍了电树的生长。此外，合理的填料含量和优化的结构设计可显着降低电导率，从而实现出色的放电效率。在优化的三明治结构复合材料中，高能量密度为14.2 J cm -3当击穿强度为420 MV m -1时，可获得极好的放电效率（η= 78.5％）。这种独特的夹层结构设计和高纵横比可实现高放电效率和能量存储密度，为下一代介电材料提供了参考。
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