Abstracts Book - IMRC 2018

• SA1-O008
FEW-LAYER GRAPHENE MODIFIED WITH SILICON GROWN ON
COPPER FOR LITHIUM ION BATTERY
Isaias Zeferino Gonzalez 1 , Hsien-Chieh Chiu 2 , Raynald Gauvin 2 , George P. Demopoulos 2 , Mario
Miki Yoshida 3 , Ana María Valenzuela Muñiz 4 , Ysmael Verde Gomez 1
1
Instituto Tecnológico de Cancún, División de Estudios de Posgrado e Investigación, Mexico.
2 McGill University, Department of Mining and Materials Engineering, Canada. 3 Centro de
Investigación en Materiales Avanzados, S.C., Materiales Nanoestructurados, Mexico. 4 Instituto
Tecnológico de Cancún, CONACYT- TECNM / Instituto Tecnológico de Cancún, Mexico.
Graphene is an exceptional material with high Li-ion storage property, thus, it
theoretically exhibits about six-fold higher capacity than graphite as the unique
Li-graphene multilayer structures. In the meantime, its excellent mechanical
flexibility, electronic conductivity and high surface area make graphene a
promising candidate to modulate the significant volume change during
(de)lithiation of alloy-based anode materials, such as silicon. In this work, the
few layer graphene modified with silicon was grown on a Cu foil by the aerosol
assisted chemical vapor deposition method, using toluene as carbon source and
triphenylsilane as a silicon dopant. The effect of dopant and substrate was
investigated by scanning electron microscope (SEM), transmission electron
microscope (TEM), Raman spectroscopy, X ray photoelectron spectroscopy (XPS)
and electrochemical impedance spectroscopy. SEM characterization confirmed
the uniformity of the graphene film and revealed few layers overlapped. In
addition, the folded and rolled edged of graphene layers observed by TEM
revealed that they are few layers consisting of approximately three to six sheets
of graphene stacked. Microscopy results show that Si-graphene more
amorphous structure compared to pristine graphene due to the intercalation of
silicon in the hexagonal carbon network, as it was confirmed by Raman
spectroscopy. XPS elemental surface composition analysis showed the silicon
was bonded to carbon (Si-C). Such Si-doped graphene materials exhibited
excellent stability in capacity retention, whose first irreversible loss is about 20%
more less; and it also improved its electrical conductivity.
Keywords: few layer graphene, silicon, lithium ion battery
Presenting authors email: zeferino.isaias@yahoo.com.mx