Synthesis of graphene-multiwalled carbon nanotubes hybrid nanostructure by strengthened electrostatic interaction and its lithium ion battery application

Abstract

We report a novel way of synthesizing graphene-carbon nanotube hybrid nanostructure as an anode for lithium (Li) ion batteries. For this, graphene was prepared by the solar exfoliation of graphite oxide, while multiwalled carbon nanotubes (MWNTs) were prepared by the chemical vapor deposition method. The graphene-MWNT hybrid nanostructure was synthesized by first modifying graphene surface using a cationic polyelectrolyte and MWNT surface with acid functionalization. The hybrid structure was obtained by homogeneous mixing of chemically modified graphene and MWNT constituents. This hybrid nanostructure exhibits higher specific capacity and cyclic stability. The strengthened electrostatic interaction between the positively charged surface of graphene sheets and the negatively charged surface of MWNTs prevents the restacking of graphene sheets that provides a highly accessible area and short diffusion path length for Li-ions. The higher electrical conductivity of MWNTs promotes an easier movement of the electrons within the electrode. The present synthesis scheme recommends a new pathway for large-scale production of novel hybrid carbon nanomaterials for energy storage applications and underlines the importance of preparation routes followed for synthesizing nanomaterials.

Carbon Nanofibers-Poly-3-hydroxyalkanoates Nanocomposite: Ultrasound-Assisted Dispersion and Thermostructural Properties

“…This observation was found to be in agreement with reported shifting of the said band in polyester carbonyl groups due to the increase in crystallinity [41]. The absorption band at 1633 cm −1 belongs to C=C [42,43]. The series of bands between 1543 and 1450 cm −1 were reported to be due to CH bending of methyl and methylene groups [41]; this region is also known to overlap with C-O-C stretching vibrations [43,44].…”

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

“…[ 70 ] However, their lithium-ion storage performances were not very promising (Table 1 ). Several other structures such as aerogel-derived RGO paper, [ 71 ] functionalized-RGO/carbon nanotubes hybrid [ 72 ] and RGO/sulfur-doped porous carbons [ 73 ] (with carbons derived from the 1-butyl-3-methylimidazolium hydrosulfate ionic liquid) were also reported (Table 1 ). Nevertheless, despite the enhanced cycling stability of the RGO/ sulfur-doped porous carbons, [ 73 ] no effective progress could be clearly appreciated in the other cases.…”

Comparisons of heat treatment on the electrochemical performance of different carbons for lithium-oxygen cells

“…The weak peaks at around 2920 cm −1 and 1410 cm −1 are attributed to the stretching vibrations of asymmetric CH 2 and C-OH, respectively. The peaks ranging from 1580 cm −1 to 1640 cm −1 are the characteristic C = C stretching [50]. From the FTIR peak intensities and positions, the type and amount of the surface functional groups of CNTs and AC are similar, which are much more than that of AB.…”