期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 10, 页码 5238-5247出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b12117
关键词
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资金
- National Natural Science Foundation of China [51473107]
- Priority Academic Program Development of the Jiangsu Higher Education Institution (PAPD)
High dielectric loss and low breakdown strength have been two bottlenecks restricting applications of conductor/polymer composites for high energy storage. Herein, three kinds of layered composites, named BC, BCB, and CBC, were fabricated through stacking up hexagonal boron nitride (hBN)/cyanate ester (CE) (B layer) on carbon nanotube (CNT)/CE with 0.4 wt % CNTs (C layer). The effects of ply pattern and composition on dielectric properties, breakdown strength, and energy density of composites were investigated and also compared with those of single-layer 0.4CNT/CE composite containing 0.4 wt % of CNTs. Results show that three kinds of layered composites have significantly reduced dielectric loss and improved breakdown strength and energy density. Especially, for the CBC composite with 20 wt % hBN in B layer (C20BC), its dielectric constant is as high as 323 (100 Hz) and retains a value larger than 270 (1-10(3) Hz), it is the highest value reported so far among multilayered composites based on conductor/polymer and insulating layers; moreover, its breakdown strength and energy density are about 1.5 and 25 times of that of 0.4CNT/CE composite, respectively. Note that C20BC composite has very low dielectric loss (0.049 at 100 Hz) or much less at increased frequencies (>100 Hz), only about 2.6 x 10(-3) times of that at 100 Hz of 0.4CNT/CE composite. The origin behind these attractive properties was intensively discussed.
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