Long-life superlithiation of few-layered covalent organic nanosheets via graphene quantum dots/carbon nanotube stabilized three-dimensional architecture

Chen, X; Ci, C; Sun, W; Chen, S; Liu, H; Wang, Y

Long-life superlithiation of few-layered covalent organic nanosheets via graphene quantum dots/carbon nanotube stabilized three-dimensional architecture

Chen, X Ci, C Sun, W Chen, S Liu, H

Wang, Y

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Publisher:: ROYAL SOC CHEMISTRY
Publication Type:: Journal Article
Citation:: Journal of Materials Chemistry A, 2022, 10, (40), pp. 21701-21715
Issue Date:: 2022-09-11

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Field	Value	Language
dc.contributor.author	Chen, X
dc.contributor.author	Ci, C
dc.contributor.author	Sun, W
dc.contributor.author	Chen, S
dc.contributor.author	Liu, H https://orcid.org/0000-0003-0266-9472
dc.contributor.author	Wang, Y
dc.date.accessioned	2023-02-23T05:08:38Z
dc.date.available	2023-02-23T05:08:38Z
dc.date.issued	2022-09-11
dc.identifier.citation	Journal of Materials Chemistry A, 2022, 10, (40), pp. 21701-21715
dc.identifier.issn	2050-7488
dc.identifier.issn	2050-7496
dc.identifier.uri	http://hdl.handle.net/10453/166393
dc.description.abstract	Organic electrodes have aroused growing interest by virtue of their molecular diversity, environmental friendliness, and operation safety. However, sluggish lithium diffusion kinetics, dissolution in the organic electrolyte, poor electrical conductivity and low reversible capacities are the bottlenecks compared to their inorganic counterparts. Herein, we report a new type of exfoliated covalent organic nanosheet (E-CON) based composite electrode with large reversible capacities for lithium organic batteries based on intriguing new lithium storage sites of C 00000000 00000000 00000000 00000000 11111111 00000000 11111111 00000000 00000000 00000000 C and higher utilization efficiency of C N redox sites compared to its bulk counterpart. The surface modification of the E-CONs by carboxyl-functionalized graphene quantum dots (GQDs) and carbon nanotubes can ensure long cycle life of the electrode due to the facilitated transfer of charge or lithium and prevent restacking of E-CONs. The E-CON based composite electrode exhibits an extremely large reversible capacity of 1386 mA h g−1 (1687 mA h g−1 based on E-CON contribution in the composite) after 300 cycles at 100 mA g−1 with good high-rate capability. The lithium storage mechanism is determined to be one lithium ion per C N and two lithium ions per C C group from five hyper-conjugated benzene rings.
dc.language	English
dc.publisher	ROYAL SOC CHEMISTRY
dc.relation.ispartof	Journal of Materials Chemistry A
dc.relation.isbasedon	10.1039/d2ta04581h
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0303 Macromolecular and Materials Chemistry, 0912 Materials Engineering, 0915 Interdisciplinary Engineering
dc.title	Long-life superlithiation of few-layered covalent organic nanosheets via graphene quantum dots/carbon nanotube stabilized three-dimensional architecture
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0303 Macromolecular and Materials Chemistry
utslib.for	0912 Materials Engineering
utslib.for	0915 Interdisciplinary Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access	*
dc.date.updated	2023-02-23T05:08:37Z
pubs.issue	40
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	40

Abstract:

Organic electrodes have aroused growing interest by virtue of their molecular diversity, environmental friendliness, and operation safety. However, sluggish lithium diffusion kinetics, dissolution in the organic electrolyte, poor electrical conductivity and low reversible capacities are the bottlenecks compared to their inorganic counterparts. Herein, we report a new type of exfoliated covalent organic nanosheet (E-CON) based composite electrode with large reversible capacities for lithium organic batteries based on intriguing new lithium storage sites of C 00000000 00000000 00000000 00000000 11111111 00000000 11111111 00000000 00000000 00000000 C and higher utilization efficiency of C N redox sites compared to its bulk counterpart. The surface modification of the E-CONs by carboxyl-functionalized graphene quantum dots (GQDs) and carbon nanotubes can ensure long cycle life of the electrode due to the facilitated transfer of charge or lithium and prevent restacking of E-CONs. The E-CON based composite electrode exhibits an extremely large reversible capacity of 1386 mA h g−1 (1687 mA h g−1 based on E-CON contribution in the composite) after 300 cycles at 100 mA g−1 with good high-rate capability. The lithium storage mechanism is determined to be one lithium ion per C N and two lithium ions per C C group from five hyper-conjugated benzene rings.

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http://hdl.handle.net/10453/166393