Fabrication of (Co,Mn)3O4/rGO Composite for Lithium Ion Battery Anode by a One-Step Hydrothermal Process with H2O2 as Additive

Abstract

Binary transition metal oxides have been regarded as one of the most promising candidates for high-performance electrodes in energy storage devices, since they can offer high electrochemical activity and high capacity. Rational designing nanosized metal oxide/carbon composite architectures has been proven to be an effective way to improve the electrochemical performance. In this work, the (Co,Mn)3O4 spinel was synthesized and anchored on reduced graphene oxide (rGO) nanosheets using a facile and single hydrothermal step with H2O2 as additive, no further additional calcination required. Analysis showed that this method gives a mixed spinel, i.e. (Co,Mn)3O4, having 2+ and 3+ Co and Mn ions in both the octahedral and tetrahedral sites of the spinel structure, with a nanocubic morphology roughly 20 nm in size. The nanocubes are bound onto the rGO nanosheet uniformly in a single hydrothermal process, then the as-prepared (Co,Mn)3O4/rGO composite was characterized as the anode materials for Li-ion battery (LIB). It can deliver 1130.6 mAh g-1 at current density of 100 mA g-1 with 98% of coulombic efficiency after 140 cycles. At 1000 mA g-1, the capacity can still maintain 750 mAh g-1, demonstrating excellent rate capabilities. Therefore, the one-step process is a facile and promising method to fabricate metal oxide/rGO composite materials for energy storage applications.

Fabrication of Multi-Vacancy-Defect MWCNTs by the Removal of Metal Oxide Nanoparticles

“…The deconvoluted XPS spectra of Co 2p showed two main peaks at the binding energies of 780.08 eV and 794.88 eV, respectively, corresponding to 2p 3/2 and 2p 1/2 along with their corresponding satellite peaks at the binding energies of 784.82 eV and 803.00 eV, respectively, similar to those observed in Co 3 O 4 reported previously [ 50 ]. Additionally, the deconvoluted XPS spectra of Mn 2p showed two main peaks at the binding energies of 642.08 eV and 652.88 eV, respectively, corresponding to 2p 3/2 and 2p 1/2 similar to those observed in Mn 3 O 4 reported previously [ 51 ]. In the case of Co 3 O 4 , which is actually a mixed oxidation state of Co(II) and Co(III), expect to see peaks due to the Co 2+ and Co 3+ states.…”

REVIEW: APLIKASI BAHAN KOMPOSIT BERBASIS REDUCED GRAPHENE OXIDE (rGO)

“…Beberapa penelitian material komposit berbasis rGO (Y. J. Meng et al, 2017;Park et al, 2017;Z. Li et al, 2016;X.…”