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Ultrafine CoO Embedded Reduced Graphene Oxide Nanocomposites: A High Rate Anode for Li–Ion Battery
Author(s) -
Bindumadhavan Kartick,
Yeh MingHsiu,
Chou Tsuchin,
Chang PeiYi,
Doong Rueyan
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601099
Subject(s) - graphene , materials science , nanocomposite , anode , oxide , electrochemistry , electrolyte , chemical engineering , x ray photoelectron spectroscopy , nanoparticle , lithium ion battery , cobalt oxide , lithium (medication) , current density , battery (electricity) , inorganic chemistry , nanotechnology , electrode , metallurgy , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
A novel and simple strategy for the synthesis of cobalt oxide decorated reduced graphene oxide (CoO‐rGO) nanocomposites was developed as a high performance anode for lithium ion battery (LIB). The CoO‐rGO nanocomposites were prepared by simultaneous reduction of GO and Co 2+ in the presence of NaBH 4 . Addition of 15 wt% rGO produced a narrow size distribution of ultra‐fine CoO nanoparticles with nano‐dimensional contact between CoO and rGO leading to an excellent electrochemical performance. The reversible capacity of CoO‐rGO nanocomposites is between 1140 and 1260 mAh/g at the current density of 150 mA/g and sustained at 473 mAh/g at high current density of 2400 mA/g. In addition to the excellent rate capability of 15 wt% CoO‐rGO, a reversible capacity of 690 mAh/g is achieved at 600 mA/g after 60 cycles. In addition, XPS spectra and XRD patterns of CoO‐rGO after cycling clearly indicate the involvement of electrolyte into CoO nanoparticles during intercalation‐deintercalation cycling, and lead to the transformation of Co species from Co 2+ to Co 3+ for the enhanced electrochemical performance at high current density.