TY - JOUR
T1 - BN-PVDF/rGO-PVDF Laminate Nanocomposites for Energy Storage Applications
AU - Agbabiaka, Okikiola Ganiu
AU - Adegun, Miracle Hope
AU - Chan, Kit Ying
AU - Zhang, Heng
AU - Shen, Xi
AU - Kim, Jang Kyo
N1 - Funding Information:
This research was funded by “Research Grants Council (GRF Projects: 16205517, 16209917 and 16200720)” and “Innovation and Technology Commission (ITS/012/19) of Hong Kong SAR”.
Publisher Copyright:
© 2022 by the authors.
PY - 2022/12
Y1 - 2022/12
N2 - 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.
AB - 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.
KW - boron nitride nanosheets (BNNS)
KW - charge energy density
KW - dielectric composites
KW - multiple layer structure
KW - reduced graphene oxides (rGO)
UR - http://www.scopus.com/inward/record.url?scp=85144835792&partnerID=8YFLogxK
U2 - 10.3390/nano12244492
DO - 10.3390/nano12244492
M3 - Journal article
AN - SCOPUS:85144835792
SN - 2079-4991
VL - 12
JO - Nanomaterials
JF - Nanomaterials
IS - 24
M1 - 4492
ER -