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Type: Journal article
Title: Binder-free Co-CoOₓ nanowire arrays for lithium ion batteries with excellent rate capability and ultra-long cycle life
Other Titles: Binder-free Co-CoO(x) nanowire arrays for lithium ion batteries with excellent rate capability and ultra-long cycle life
Author: Zhan, L.
Wang, S.
Ding, L.
Li, Z.
Wang, H.
Citation: Journal of Materials Chemistry A, 2015; 3(39):19711-19717
Publisher: Royal Society of Chemistry
Issue Date: 2015
ISSN: 2050-7488
Statement of
Liang Zhan, Suqing Wang, Liang-Xin Ding, Zhong Lia and Haihui Wang
Abstract: Structure stability and fast charge–discharge capacity are highly desirable for electrode materials applied in lithium ion batteries (LIBs). In this report, binder-free Co–CoOx nanowire arrays (NWAs) were obtained by a simple H2 reduction of Co3O4 NWAs. The resulting Co–CoOx NWAs were grown directly on the current collector with enough open space between each nanowire, which provides fast charge transfer channels and large accessible surface area to the electrolyte. More importantly, the introduction of electrochemically inactive Co without volume change during cycling for LIBs could improve the structural stability of the Co–CoOx NWA electrode and the high electronic conductivity of metallic Co in the array structure greatly enhances the electron transfer ability of Co–CoOx nanowires. Benefitting from those designed structural features, the binder-free Co–CoOx NWAs achieved remarkable electrochemical performances with excellent cycle stability at high rates and high rate capacity. The Co–CoOx NWA electrode maintains highly stable capacities of 990 and 740 mA h g−1 after 1000 cycles at 10 and 20 A g−1, respectively. At an ultrahigh rate of 50 A g−1, a high reversible capacity of 413 mA h g−1 is achieved. The result demonstrates that such a novel Co–CoOx nanowire array structure is a new strategy to design high performance anode materials for LIBs.
Rights: This journal is © The Royal Society of Chemistry 2015
RMID: 0030037643
DOI: 10.1039/c5ta02987b
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Appears in Collections:Chemical Engineering publications

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