BN-PVDF/rGO-PVDF Laminate Nanocomposites for Energy Storage Applications

Okikiola Ganiu Agbabiaka, Miracle Hope Adegun, Kit Ying Chan, Heng Zhang, Xi Shen, Jang Kyo Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The increasing demand for high energy storage devices calls for concurrently enhanced dielectric constants and reduced dielectric losses of polymer dielectrics. In this work, we rationally design dielectric composites comprising aligned 2D nanofillers of reduced graphene oxide (rGO) and boron nitride nanosheets (BNNS) in a polyvinylidene fluoride (PVDF) matrix through a novel press-and-fold technique. Both nanofillers play different yet complementary roles: while rGO is designed to enhance the dielectric constant through charge accumulation at the interfaces with polymer, BNNS suppress the dielectric loss by preventing the mobility of free electrons. The microlaminate containing eight layers each of rGO/PVDF and BNNS/PVDF films exhibits remarkable dielectric performance with a dielectric constant of 147 and an ultralow dielectric loss of 0.075, due to the synergistic effect arising from the alternatingly electrically conductive and insulating films. Consequently, a maximum energy density of 3.5 J/cm3—about 18 times the bilayer composite counterpart—is realized. The high thermal conductivities of both nanofillers and their alignment endow the microlaminate with an excellent in-plane thermal conductivity of 6.53 Wm−1K−1, potentially useful for multifunctional applications. This work offers a simple but effective approach to fabricating a composite for high dielectric energy storage using two different 2D nanofillers.

Original languageEnglish
Article number4492
JournalNanomaterials
Volume12
Issue number24
DOIs
Publication statusPublished - Dec 2022

Keywords

  • boron nitride nanosheets (BNNS)
  • charge energy density
  • dielectric composites
  • multiple layer structure
  • reduced graphene oxides (rGO)

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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