Yue Shuangshuang, Wan Baoquan, Liu Yunying, Zhang Qiwei
Inner Mongolia Key Laboratory of Ferroelectric-related New Energy Materials and Devices, Inner Mongolia University of Science and Technology 7# Arding Street, Kun District Baotou 014010 China
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology 7# Arding Street, Kun District Baotou 014010 China.
RSC Adv. 2019 Mar 7;9(14):7706-7717. doi: 10.1039/c8ra10434d. eCollection 2019 Mar 6.
In this work, reduced BaTiO (rBT) particles with a large number of defects sintered in a reducing atmosphere (95N/5H) were introduced into polyimide (PI) matrix without using any modifier or surfactant components. The rBT/PI composite films fabricated by an polymerization method showed significantly enhanced dielectric constant and energy storage density. The dielectric constant of the rBT/PI composite with 30 wt% rBT reached up to 31.6, while maintaining lower loss (tg = 0.031@1000 kHz) compared to pure PI ( = 4.1). Its energy storage density (9.7 J cm at 2628 kV cm) was enhanced by more than 400% over that of pure PI (1.9 J cm at 3251 kV cm), and was greater than the energy density of the best commercial biaxially-oriented-polypropylenes (BOPP) (1.2 J cm at 6400 kV cm). The energy storage efficiency was around 90% due to the linear dielectric performance of rBT/PI composite films. The improved dielectric constant and energy storage density could be attributed to the combined effect of the interface interaction between two phases and the surface defects of rBT induced by the reducing atmosphere. Therefore, rBT/PI composite films with high dielectric constant, energy storage density and storage efficiency may have potential applications in the preparation of embedded capacitors.
在本工作中，将在还原气氛（95N/5H）中烧结的具有大量缺陷的还原钛酸钡（rBT）颗粒引入聚酰亚胺（PI）基体中，且未使用任何改性剂或表面活性剂成分。通过聚合方法制备的rBT/PI复合薄膜表现出显著提高的介电常数和储能密度。含30 wt% rBT的rBT/PI复合材料的介电常数高达31.6，同时与纯PI（ε = 4.1）相比保持较低的损耗（tgδ = 0.031@1000 kHz）。其储能密度（在2628 kV/cm时为9.7 J/cm³）比纯PI（在3251 kV/cm时为1.9 J/cm³）提高了400%以上，且大于最佳商用双向拉伸聚丙烯（BOPP）的能量密度（在6400 kV/cm时为1.2 J/cm³）。由于rBT/PI复合薄膜的线性介电性能，储能效率约为90%。介电常数和储能密度的提高可归因于两相之间的界面相互作用以及还原气氛诱导的rBT表面缺陷的综合作用。因此，具有高介电常数、储能密度和储能效率的rBT/PI复合薄膜在嵌入式电容器的制备中可能具有潜在应用。
