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Superior electrochemical properties of SiO2-doped Co3O4 hollow nanospheres obtained through nanoscale Kirkendall diffusion for lithium-ion batteries

Authors
Won, Jong MinCho, Jung SangKang, Yun Chan
Issue Date
25-9월-2016
Publisher
ELSEVIER SCIENCE SA
Keywords
Kirkendall diffusion; Cobalt oxide; Anode material; Lithium-ion battery; Flame spray pyrolysis
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.680, pp.366 - 372
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
680
Start Page
366
End Page
372
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/87487
DOI
10.1016/j.jallcom.2016.04.104
ISSN
0925-8388
Abstract
Hollow SiO2-doped Co3O4 (Si-Co3O4) nanospheres with excellent Li-ion storage properties were synthesized via flame spray pyrolysis by applying a nanoscale Kirkendall diffusion process. A solid SiO2-doped CoO (filled Si-CoO) nanopowder was prepared through this process, and then it was transformed into hollow Si-Co3O4 nanopowder by way of a core-shell-structured Co-SiO2 (filled Co@Si-CoO) composite nanopowder. In addition, the direct oxidation of the filled Si-CoO nanopowder at 300 degrees C under an air atmosphere resulted in the formation of a solid SiO2-doped Co3O4 (filled Si-Co3O4) nanopowder. At a high current density of 2 A g(-1), the hollow Si-Co3O4 nanospheres exhibited a 150th-cycle discharge capacity of 971 mA h g(-1) and capacity retention of 99.5%, which was measured relative to the second cycle. However, the corresponding capacity retentions of the filled Si-CoO and Si-Co3O4 nanopowders were only 82.2% and 71.5%, respectively. The high structural stability during cycling and high Li-ion conductivity, which are caused by the hollow structure, are responsible for the excellent Li-ion storage properties of the hollow Si-Co3O4 nanospheres obtained through nanoscale Kirkendall diffusion. (C) 2016 Elsevier B.V. All rights reserved.
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