Hollow-shell structured porous CoSe<inf>2</inf>microspheres encapsulated by MXene nanosheets for advanced lithium storage

Hong, L; Ju, S; Yang, Y; Zheng, J; Xia, G; Huang, Z; Liu, X; Yu, X

Hollow-shell structured porous CoSe<inf>2</inf>microspheres encapsulated by MXene nanosheets for advanced lithium storage

Hong, L Ju, S Yang, Y Zheng, J Xia, G Huang, Z

Liu, X Yu, X

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Publisher:: ROYAL SOC CHEMISTRY
Publication Type:: Journal Article
Citation:: Sustainable Energy and Fuels, 2020, 4, (5), pp. 2352-2362
Issue Date:: 2020-05-01

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Field	Value	Language
dc.contributor.author	Hong, L
dc.contributor.author	Ju, S
dc.contributor.author	Yang, Y
dc.contributor.author	Zheng, J
dc.contributor.author	Xia, G
dc.contributor.author	Huang, Z https://orcid.org/0000-0003-1985-0884
dc.contributor.author	Liu, X
dc.contributor.author	Yu, X
dc.date.accessioned	2021-07-05T10:32:42Z
dc.date.available	2021-07-05T10:32:42Z
dc.date.issued	2020-05-01
dc.identifier.citation	Sustainable Energy and Fuels, 2020, 4, (5), pp. 2352-2362
dc.identifier.issn	2398-4902
dc.identifier.issn	2398-4902
dc.identifier.uri	http://hdl.handle.net/10453/149828
dc.description.abstract	Cobalt diselenide (CoSe2), a representative transition-metal chalcogenide (TMC), is attracting intensive interest as an anode material for lithium ion batteries (LIBs), in view of its high specific capacity based on the conversion reaction mechanism. However, the huge volume variation and low intrinsic electrical conductivity during the charge/discharge process lead to inferior rate performance and short cycle life of the CoSe2electrode, which severely hinder its practical application. Herein, novel hollow-shell structured porous CoSe2microspheres are constructed by selenization of Co-MOFs based on the Kirkendall effect. Furthermore, CoSe2@MXene robust structures, comprised of inner hollow CoSe2microspheres and an outer MXene flake coating, are fabricated by a facile electrostatic self-assembly method. The as-obtained CoSe2@MXene hybrids possess the combined advantages of the high capacity of CoSe2hollow spheres and high conductivity of MXene flakes. More importantly, strong chemical interactions (Co-O-Ti covalent bonds) between CoSe2and oxygen functionalized Ti3C2MXene are formed at the interface, which could boost the electron/ion transport kinetics and enhance the structural durability of CoSe2@MXene hybrids, resulting in the improvement of rate performance and cycling stability. Consequently, as anode materials for LIBs, the CoSe2@MXene hybrids deliver an admirable reversible capacity of 1051 mA h g−1at 200 mA g−1, a superior rate capability of 465 mA h g−1at 5 A g−1, and excellent long-term cycling properties at 1 A g−1with a capacity of 1279 mA h g−1after 1000 cycles. The hollow-shell structured porous materials coated by the MXene strategy provide an effective route for designing new anode materials with excellent electrochemical properties.
dc.language	English
dc.publisher	ROYAL SOC CHEMISTRY
dc.relation	http://purl.org/au-research/grants/arc/DP170101773
dc.relation.ispartof	Sustainable Energy and Fuels
dc.relation.isbasedon	10.1039/c9se01271k
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Hollow-shell structured porous CoSe<inf>2</inf>microspheres encapsulated by MXene nanosheets for advanced lithium storage
dc.type	Journal Article
utslib.citation.volume	4
utslib.for	090403 Chemical Engineering Design
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access	*
dc.date.updated	2021-07-05T10:32:39Z
pubs.issue	5
pubs.publication-status	Published
pubs.volume	4
utslib.citation.issue	5

Abstract:

Cobalt diselenide (CoSe2), a representative transition-metal chalcogenide (TMC), is attracting intensive interest as an anode material for lithium ion batteries (LIBs), in view of its high specific capacity based on the conversion reaction mechanism. However, the huge volume variation and low intrinsic electrical conductivity during the charge/discharge process lead to inferior rate performance and short cycle life of the CoSe2electrode, which severely hinder its practical application. Herein, novel hollow-shell structured porous CoSe2microspheres are constructed by selenization of Co-MOFs based on the Kirkendall effect. Furthermore, CoSe2@MXene robust structures, comprised of inner hollow CoSe2microspheres and an outer MXene flake coating, are fabricated by a facile electrostatic self-assembly method. The as-obtained CoSe2@MXene hybrids possess the combined advantages of the high capacity of CoSe2hollow spheres and high conductivity of MXene flakes. More importantly, strong chemical interactions (Co-O-Ti covalent bonds) between CoSe2and oxygen functionalized Ti3C2MXene are formed at the interface, which could boost the electron/ion transport kinetics and enhance the structural durability of CoSe2@MXene hybrids, resulting in the improvement of rate performance and cycling stability. Consequently, as anode materials for LIBs, the CoSe2@MXene hybrids deliver an admirable reversible capacity of 1051 mA h g−1at 200 mA g−1, a superior rate capability of 465 mA h g−1at 5 A g−1, and excellent long-term cycling properties at 1 A g−1with a capacity of 1279 mA h g−1after 1000 cycles. The hollow-shell structured porous materials coated by the MXene strategy provide an effective route for designing new anode materials with excellent electrochemical properties.

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