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Synthesis of 2D/2D Structured Mesoporous Co 3 O 4 Nanosheet/N‐Doped Reduced Graphene Oxide Composites as a Highly Stable Negative Electrode for Lithium Battery Applications
Author(s) -
Sennu Palanichamy,
Kim Hyo Sang,
An Jae Youn,
Aravindan Vanchiappan,
Lee YunSung
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500466
Subject(s) - x ray photoelectron spectroscopy , nanosheet , graphene , materials science , dielectric spectroscopy , mesoporous material , raman spectroscopy , lithium (medication) , oxide , chemical engineering , nanotechnology , electrode , composite number , composite material , electrochemistry , chemistry , catalysis , medicine , biochemistry , physics , optics , endocrinology , engineering , metallurgy
Mesoporous Co 3 O 4 nanosheets (Co 3 O 4 ‐NS) and nitrogen‐doped reduced graphene oxide (N‐rGO) are synthesized by a facile hydrothermal approach, and the N‐rGO/Co 3 O 4 ‐NS composite is formulated through an infiltration procedure. Eventually, the obtained composites are subjected to various characterization techniques, such as XRD, Raman spectroscopy, surface area analysis, X‐ray photoelectron spectroscopy (XPS), and TEM. The lithium‐storage properties of N‐rGO/Co 3 O 4 ‐NS composites are evaluated in a half‐cell assembly to ascertain their suitability as a negative electrode for lithium‐ion battery applications. The 2D/2D nanostructured mesoporous N‐rGO/Co 3 O 4 ‐NS composite delivered a reversible capacity of about 1305 and 1501 mAh g −1 at a current density of 80 mA g −1 for the 1st and 50th cycles, respectively. Furthermore, excellent cyclability, rate capability, and capacity retention characteristics are noted for the N‐rGO/Co 3 O 4 ‐NS composite. This improved performance is mainly related to the existence of mesoporosity and a sheet‐like 2D hierarchical morphology, which translates into extra space for lithium storage and a reduced electron pathway. Also, the presence of N‐rGO and carbon shells in Co 3 O 4 ‐NS should not be excluded from such exceptional performance, which serves as a reliable conductive channel for electrons and act as synergistically to accommodate volume expansion upon redox reactions. Ex‐situ TEM, impedance spectroscopy, and XPS, are also conducted to corroborate the significance of the 2D morphology towards sustained lithium storage.