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Greatly improving energy storage density and reducing dielectric loss of carbon nanotube/cyanate ester composites through building a unique tri-layered structure with mica paper

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Abstract

High dielectric loss and low energy storage density are common problems in available high dielectric constant composites consisting of a conductor and polymer. Herein, two unique kinds of tri-layered structure composites were designed and prepared. Specifically, 0.6 wt% of hydroxylated multi-walled carbon nanotubes (CNTs) were added into epoxy modified cyanate ester resin (CEP) to form a composite (CNT/CEP), which was used as the first and third layers of the tri-layered structure composite, respectively; the second layer is mica paper (MP) infiltrated with CNT/CEP or CEP resin. Consequently, the obtained tri-layered structure composite was coded as CNT/CEP–MPI–CNT/CEP or CNT/CEP–MPII–CNT/CEP. The influence of the thickness of MP and infiltration resin on the structure, dielectric properties and energy storage density of the tri-layered structure composite were investigated. The results show that with the same frequency and thickness of MP, the CNT/CEP–MPII–CNT/CEP composite has lower dielectric loss and larger energy storage density than CNT/CEP–MPI–CNT/CEP. More specifically, for the CNT/CEP–MPII–CNT/CEP composite in which the thickness of MP is 60 μm, the dielectric loss is only 0.07 at 100 Hz, about 7.6 × 10−5 times that of CNT/CEP; moreover, the energy storage density is 16.5 times that of CNT/CEP. This great increase in energy storage density and the simultaneous reduction in dielectric loss are the best values reported so far among composites based on a conductor/polymer layer and an insulating layer. The origin behind these attractive dielectric properties and energy storage densities of the tri-layered structure composites was discussed through simulating the equivalent circuit and correlating with structures.

Graphical abstract: Greatly improving energy storage density and reducing dielectric loss of carbon nanotube/cyanate ester composites through building a unique tri-layered structure with mica paper

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Publication details

The article was received on 17 Aug 2017, accepted on 25 Sep 2017 and first published on 25 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA07263E
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Greatly improving energy storage density and reducing dielectric loss of carbon nanotube/cyanate ester composites through building a unique tri-layered structure with mica paper

    X. Zhang, L. Yuan, Q. Guan, G. Liang and A. Gu, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA07263E

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