Zhong Jiaming, Li Weiyan, Qian Jing, Fu Chao, Chu Huiying, Xu Jingjing, Ran Xianghai, Nie Wei
Lab of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Lab of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
J Colloid Interface Sci. 2021 Mar 15;586:30-38. doi: 10.1016/j.jcis.2020.10.066. Epub 2020 Oct 26.
Flexible dielectric materials such as poly(vinylidene fluoride)-based nanocomposites with high energy density are employed for applications in modern electronic and electric systems. In this study, we improve traditional methods by optimizing the interfacial structure, achieving a 34% increase in energy density without reduced discharge efficiency. Herein, a simple solution-cast method is used to prepare poly(vinylidene fluoride-co-trifluoroethylene) nanocomposites filled by γ-methacryloyl-propyltrimethoxysilane (MPMS) grafting barium titanate nanoparticles, forming a class of cross-linking networks by irradiation. More additional interfaces arising from irradiation cross-linking give rise to high discharge energy density, and the small crystalline domain and cross-linking network enhance the charge-discharge efficiency. Furthermore, we find two types of cross-linking centers on the network. One is more beneficial to energy density, and the other is more beneficial to efficiency. Regulating two types of cross-linking centers can balance efficiency and energy density. In summary, this work provides a promising strategy for exploiting advanced flexible dielectric materials to meet application requirements.
具有高能量密度的柔性介电材料，如聚偏氟乙烯基纳米复合材料，被应用于现代电子和电气系统中。在本研究中，我们通过优化界面结构改进了传统方法，在不降低放电效率的情况下使能量密度提高了34%。在此，采用一种简单的溶液浇铸法制备了由γ-甲基丙烯酰丙基三甲氧基硅烷（MPMS）接枝钛酸钡纳米颗粒填充的聚偏氟乙烯-三氟乙烯共聚物纳米复合材料，通过辐照形成一类交联网络。辐照交联产生的更多额外界面导致了高放电能量密度，而小的晶域和交联网络提高了充放电效率。此外，我们在网络上发现了两种类型的交联中心。一种对能量密度更有利，另一种对效率更有利。调节这两种交联中心可以平衡效率和能量密度。总之，这项工作为开发先进的柔性介电材料以满足应用需求提供了一种有前景的策略。
