Significantly enhanced energy storage performance promoted by ultimate sized ferroelectric BaTiO3 fillers in nanocomposite films
Significantly enhanced energy storage performance promoted by ultimate sized ferroelectric BaTiO3 fillers in nanocomposite films
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纳米复合薄膜中最终尺寸的铁电 BaTiO3 填料显着增强了储能性能
DOI：
10.1016/j.nanoen.2016.11.008
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发表时间：
2017-01-01
期刊：
影响因子：
17.6
通讯作者：
Li, Longtu
中科院分区：
文献类型：
--
作者：
Hao, Yanan;Wang, Xiaohui;Li, Longtu
聚合物纳米复合材料由分散的颗粒填料和柔性聚合物基体组成，具有综合优异的介电性能，被认为是高性能储能电容器的理想介质层。然而，通常使用的高介电常数颗粒填料导致不可避免的介电强度劣化，并严重阻碍纳米复合材料的能量密度和可靠性。为了解决这个问题，最终尺寸的铁电纳米填料，6.9纳米钛酸钡纳米晶体，被引入到聚（偏氟乙烯-共-六氟丙烯）（PVDF-HFP）聚合物基体中，以实现高介电常数和增强的击穿强度。研究了纳米粒子含量对复合薄膜微观结构和介电性能的影响。与具有粗颗粒填料的聚合物陶瓷复合材料相比，在含有10-40体积%的纳米复合材料膜中观察到显著提高的击穿强度（>= 330 kV/mm）。钛酸钡纳米填料。因此，获得9.7 J/cm（3）的最大放电能量密度，这证实了这些最终尺寸的纳米晶体可以在用于能量存储应用的纳米复合材料中作为上级高介电常数填料。
Polymer nanocomposite that consists of dispersed particle fillers and a flexible polymer matrix shows comprehensive excellent dielectric properties and thus is considered as promising dielectric layers in high-performance energy-storage capacitors. However, the commonly employed high permittivity particle fillers cause inevitable dielectric strength deterioration and seriously impede the energy density and reliability of the nanocomposite. To solve this problem, ultimate sized ferroelectric nanofillers, 6.9 nm BaTiO3 nanocrystals, are introduced into a poly(vinylidene fluoride-co-hexafluoro propylene) (PVDF-HFP) polymer matrix to realize both the high dielectric constant and enhanced breakdown strength. The influence of nanoparticle fraction on the microstructure and dielectric properties of the composite films is investigated. Compared to the polymer ceramic composites with coarse particle fillers, significantly enhanced breakdown strengths (>= 330 kV/mm) are observed in the nanocomposite films containing 10-40 vol.% BaTiO3 nanofillers. In consequence, a maximal discharged energy density of 9.7 J/cm(3) is obtained, which confirms that these ultimate sized nanocrystals can perform as superior high permittivity fillers in the nanocomposites for energy storage applications.