A robust flame retardant fluorinated polyimide nanofiber separator for high-temperature lithium-sulfur batteries

Luo, X; Lu, X; Chen, X; Chen, Y; Song, C; Yu, C; Wang, N; Su, D; Wang, C; Gao, X; Wang, G; Cui, L

A robust flame retardant fluorinated polyimide nanofiber separator for high-temperature lithium-sulfur batteries

Luo, X Lu, X Chen, X Chen, Y Song, C Yu, C Wang, N Su, D

Wang, C Gao, X Wang, G

Cui, L

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Publisher:: ROYAL SOC CHEMISTRY
Publication Type:: Journal Article
Citation:: Journal of Materials Chemistry A, 2020, 8, (29), pp. 14788-14798
Issue Date:: 2020-08-07

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Field	Value	Language
dc.contributor.author	Luo, X
dc.contributor.author	Lu, X
dc.contributor.author	Chen, X
dc.contributor.author	Chen, Y
dc.contributor.author	Song, C
dc.contributor.author	Yu, C
dc.contributor.author	Wang, N
dc.contributor.author	Su, D https://orcid.org/0000-0002-3972-8205
dc.contributor.author	Wang, C
dc.contributor.author	Gao, X
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578
dc.contributor.author	Cui, L
dc.date.accessioned	2020-10-15T05:21:38Z
dc.date.available	2020-10-15T05:21:38Z
dc.date.issued	2020-08-07
dc.identifier.citation	Journal of Materials Chemistry A, 2020, 8, (29), pp. 14788-14798
dc.identifier.issn	2050-7488
dc.identifier.issn	2050-7496
dc.identifier.uri	http://hdl.handle.net/10453/143262
dc.description.abstract	© 2020 The Royal Society of Chemistry. The detrimental shuttle effect of lithium polysulfides (LiPSs) and the combustible features of commercial separators have hindered the practical application of lithium-sulfur (Li-S) batteries. Herein, a robust flame retardant fluorinated polyimide (F/PI) nanofiber separator has been designed for high-temperature Li-S batteries. The introduction of electron-withdrawing trifluoromethyl (-CF3) groups into the PI nanofiber not only increases its porosity to ameliorate the electrolyte uptake, electrolyte retention, and electrolyte wettability but also boosts its polarity to offer better affinity with LiPSs. More importantly, the existence of abundant -CF3 groups on the PI nanofiber can afford an electronegative environment to accelerate the transmembrane transfer of Li+ and simultaneously repel the negatively charged polysulfide ions. As a result of these advanced structural characteristics, a high initial capacity of 1512 mA h g-1 at 0.1C, an outstanding rate performance of 532 mA h g-1 at 5C, and a superior cycling stability with a capacity retention of 95.6% after 500 cycles at 1C can be achieved. Additionally, the flame-retardant F/PI nanofiber separator also delivers excellent cycling and safety performance at high temperature, holding a promising prospect for future commercialization.
dc.language	English
dc.publisher	ROYAL SOC CHEMISTRY
dc.relation	http://purl.org/au-research/grants/arc/DP160104340
dc.relation.ispartof	Journal of Materials Chemistry A
dc.relation.isbasedon	10.1039/d0ta00439a
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0303 Macromolecular and Materials Chemistry, 0912 Materials Engineering, 0915 Interdisciplinary Engineering
dc.title	A robust flame retardant fluorinated polyimide nanofiber separator for high-temperature lithium-sulfur batteries
dc.type	Journal Article
utslib.citation.volume	8
utslib.for	0303 Macromolecular and Materials Chemistry
utslib.for	0912 Materials Engineering
utslib.for	0915 Interdisciplinary Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2020-10-15T05:21:30Z
pubs.issue	29
pubs.publication-status	Published
pubs.volume	8
utslib.citation.issue	29

Abstract:

© 2020 The Royal Society of Chemistry. The detrimental shuttle effect of lithium polysulfides (LiPSs) and the combustible features of commercial separators have hindered the practical application of lithium-sulfur (Li-S) batteries. Herein, a robust flame retardant fluorinated polyimide (F/PI) nanofiber separator has been designed for high-temperature Li-S batteries. The introduction of electron-withdrawing trifluoromethyl (-CF3) groups into the PI nanofiber not only increases its porosity to ameliorate the electrolyte uptake, electrolyte retention, and electrolyte wettability but also boosts its polarity to offer better affinity with LiPSs. More importantly, the existence of abundant -CF3 groups on the PI nanofiber can afford an electronegative environment to accelerate the transmembrane transfer of Li+ and simultaneously repel the negatively charged polysulfide ions. As a result of these advanced structural characteristics, a high initial capacity of 1512 mA h g-1 at 0.1C, an outstanding rate performance of 532 mA h g-1 at 5C, and a superior cycling stability with a capacity retention of 95.6% after 500 cycles at 1C can be achieved. Additionally, the flame-retardant F/PI nanofiber separator also delivers excellent cycling and safety performance at high temperature, holding a promising prospect for future commercialization.

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http://hdl.handle.net/10453/143262