A functional hyperbranched binder enabling ultra-stable sulfur cathode for high-performance lithium-sulfur battery

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

A functional hyperbranched binder enabling ultra-stable sulfur cathode for high-performance lithium-sulfur battery

Luo, X Lu, X Chen, X Chen, Y Yu, C Su, D

Wang, G

Cui, L

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Journal of Energy Chemistry, 2020, 50, pp. 63-72
Issue Date:: 2020-11-01

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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	Yu, C
dc.contributor.author	Su, D https://orcid.org/0000-0002-3972-8205
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578
dc.contributor.author	Cui, L
dc.date.accessioned	2020-10-16T19:38:03Z
dc.date.available	2020-10-16T19:38:03Z
dc.date.issued	2020-11-01
dc.identifier.citation	Journal of Energy Chemistry, 2020, 50, pp. 63-72
dc.identifier.issn	2095-4956
dc.identifier.uri	http://hdl.handle.net/10453/143310
dc.description.abstract	© 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences Binders are of vital importance in stabilizing the cathodes to enhance the cycling stability of lithium-sulfur (Li-S) batteries. However, conventional binders are typically confronted with the drawback of inability for adsorbing lithium polysulfide (LiPS), thus resulting in severe active material losing and rapid capacity fading. Herein, a novel water-soluble hyperbranched poly(amidoamine) (HPAA) binder with controllable hyperbranched molecular structure and abundant amino end groups for Li-S battery is designed and fabricated, which can improve efficient adsorption for LiPS and stability of the sulfur cathodes. Besides, the strong intermolecular hydrogen bonds in HPAA binder can contribute to the structural stability of S cathode and integration of the conductive paths. Therefore, the Li-S battery with this functional binder exhibits excellent cycle performance with a capacity retention of 91% after 200 cycles at 0.1 C. Even at a high sulfur loading of 5.3 mg cm−2, a specific capacity of 601 mA h g−1 can also be achieved. Density functional theory (DFT) calculation further demonstrates that the enhanced electrochemical stability derives from the high binding energy between amino groups and LiPS and the wide electrochemical window (6.87 eV) of HPAA molecule. Based on the above all, this functional polymer will lighten a new species of binders for eco-friendly sulfur cathodes and significantly promote the practical applications of high-performance Li-S batteries.
dc.language	en
dc.publisher	Elsevier BV
dc.relation	Australian Renewable Energy Agency (ARENA)
dc.relation	Rail Manufacturing Cooperative Research Centre (RMCRC)
dc.relation	http://purl.org/au-research/grants/arc/DP160104340
dc.relation.ispartof	Journal of Energy Chemistry
dc.relation.isbasedon	10.1016/j.jechem.2020.02.041
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0305 Organic Chemistry
dc.subject.classification	Physical Chemistry
dc.title	A functional hyperbranched binder enabling ultra-stable sulfur cathode for high-performance lithium-sulfur battery
dc.type	Journal Article
utslib.citation.volume	50
utslib.for	0305 Organic Chemistry
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	*
dc.date.updated	2020-10-16T19:37:45Z
pubs.publication-status	Accepted
pubs.volume	50

Abstract:

© 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences Binders are of vital importance in stabilizing the cathodes to enhance the cycling stability of lithium-sulfur (Li-S) batteries. However, conventional binders are typically confronted with the drawback of inability for adsorbing lithium polysulfide (LiPS), thus resulting in severe active material losing and rapid capacity fading. Herein, a novel water-soluble hyperbranched poly(amidoamine) (HPAA) binder with controllable hyperbranched molecular structure and abundant amino end groups for Li-S battery is designed and fabricated, which can improve efficient adsorption for LiPS and stability of the sulfur cathodes. Besides, the strong intermolecular hydrogen bonds in HPAA binder can contribute to the structural stability of S cathode and integration of the conductive paths. Therefore, the Li-S battery with this functional binder exhibits excellent cycle performance with a capacity retention of 91% after 200 cycles at 0.1 C. Even at a high sulfur loading of 5.3 mg cm−2, a specific capacity of 601 mA h g−1 can also be achieved. Density functional theory (DFT) calculation further demonstrates that the enhanced electrochemical stability derives from the high binding energy between amino groups and LiPS and the wide electrochemical window (6.87 eV) of HPAA molecule. Based on the above all, this functional polymer will lighten a new species of binders for eco-friendly sulfur cathodes and significantly promote the practical applications of high-performance Li-S batteries.

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http://hdl.handle.net/10453/143310