期刊
NANO ENERGY
卷 56, 期 -, 页码 138-150出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.11.044
关键词
Interface modification; Core-shell structure; Breakdown strength; Energy storage; Thermal property
类别
资金
- National Natural Science Foundation of China [51337002, 61640019]
- Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices [KFJJ201601]
- Youth Innovative Talents Training Plan of Ordinary Undergraduate Colleges in Heilongjiang [UNPYSCT-2016157]
- Science Funds for the Young Innovative Talents of HUST [201102]
As advanced dielectric materials for the applications in electronics and electrical power systems with the ever-increasing requirements, the polymer-based dielectric nano-composites are brilliantly emerging. However, there are long standing challenges of the unsatisfactory electric breakdown strength and the heat accumulation induced by dielectric loss of composite. In this study, we propose an artificial nano-composite with excellent comprehensive performance by controlling the orientation of one-dimensional (1D) 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 nanofibers (BZCT NFs) and adjusting the interaction between BZCT NFs and poly(vinylidene fluoride) (PVDF) matrix via SiO2 buffer layer. Remarkably, PVDF nano-composite with only 3 vol% aligned BZCT NFs coated by SiO2 (BZCT@SiO2 NFs, 3 vol% Aligned BZCT@SiO2-PVDF) possesses an impressive energy storage performance, including the superior Weibull characteristic breakdown strength (E-b) of similar to 576 kV/mm and the ultrahigh discharged energy density (U-e) of similar to 18.9 J/cm(3). Meanwhile, the temperature distribution in this typical composite is more homogeneous according to the test and simulation results. This demonstrated work not only opens a new door to preparing an excellent performance of polymer-based dielectric nano-composites, but also points out a route to the industrialization of energy storage dielectrics.
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