ZnFe2O4 hollow rods enabling accelerated polysulfide conversion for advanced lithium-sulfur batteries

Zhou, L; Danilov, DL; Qiao, F; Eichel, RA; Notten, PHL

ZnFe2O4 hollow rods enabling accelerated polysulfide conversion for advanced lithium-sulfur batteries

Zhou, L Danilov, DL Qiao, F Eichel, RA Notten, PHL

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Electrochimica Acta, 2022, 414, pp. 140231
Issue Date:: 2022-05-10

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Field	Value	Language
dc.contributor.author	Zhou, L
dc.contributor.author	Danilov, DL
dc.contributor.author	Qiao, F
dc.contributor.author	Eichel, RA
dc.contributor.author	Notten, PHL
dc.date.accessioned	2023-01-23T23:31:58Z
dc.date.available	2023-01-23T23:31:58Z
dc.date.issued	2022-05-10
dc.identifier.citation	Electrochimica Acta, 2022, 414, pp. 140231
dc.identifier.issn	0013-4686
dc.identifier.uri	http://hdl.handle.net/10453/165383
dc.description.abstract	The high energy density and favorable cost-effectiveness make lithium-sulfur (Li-S) batteries one of the most attractive energy storage systems. However, the low sulfur utilization and poor cycle life, resulting from the losses of soluble polysulfide intermediates, and their sluggish redox conversion process, severely impede practical applications of reliable Li-S batteries. Effectively inhibiting the polysulfide diffusion and accelerating their conversion is beneficial to enhance the performance of sulfur cathodes. Herein, a novel carbon-free ZnFe2O4 hollow rod has been developed as an advanced host material to confine polysulfides within the cathode and accelerate the redox conversion during cycling. The soluble polysulfides anchored by the ZnFe2O4 hollow rod structure are shown to be rapidly converted to sulfur and lithium sulfides. Detrimental polysulfide diffusion is therefore effectively inhibited. The redox kinetics of sulfur cathodes has been systematically investigated, revealing that the ZnFe2O4 host can improve the activity for Li2S deposition, facilitate lithium-ion diffusion, and lower the reaction energy barriers for the multistep phase transition of sulfur. As a result, the developed S@ZnFe2O4 composite cathodes exhibit an improved cycling capacity of 1158 mAh g−1. These results demonstrate that the accelerated redox conversion of anchored polysulfides is essential for enhancing the electrochemical performance of Li-S batteries.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Electrochimica Acta
dc.relation.isbasedon	10.1016/j.electacta.2022.140231
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.rights	This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.subject	02 Physical Sciences, 03 Chemical Sciences, 09 Engineering
dc.subject.classification	Energy
dc.title	ZnFe2O4 hollow rods enabling accelerated polysulfide conversion for advanced lithium-sulfur batteries
dc.type	Journal Article
utslib.citation.volume	414
utslib.for	02 Physical Sciences
utslib.for	03 Chemical Sciences
utslib.for	09 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
utslib.copyright.status	recently_added	*
dc.date.updated	2023-01-23T23:31:53Z
pubs.publication-status	Published
pubs.volume	414

Abstract:

The high energy density and favorable cost-effectiveness make lithium-sulfur (Li-S) batteries one of the most attractive energy storage systems. However, the low sulfur utilization and poor cycle life, resulting from the losses of soluble polysulfide intermediates, and their sluggish redox conversion process, severely impede practical applications of reliable Li-S batteries. Effectively inhibiting the polysulfide diffusion and accelerating their conversion is beneficial to enhance the performance of sulfur cathodes. Herein, a novel carbon-free ZnFe2O4 hollow rod has been developed as an advanced host material to confine polysulfides within the cathode and accelerate the redox conversion during cycling. The soluble polysulfides anchored by the ZnFe2O4 hollow rod structure are shown to be rapidly converted to sulfur and lithium sulfides. Detrimental polysulfide diffusion is therefore effectively inhibited. The redox kinetics of sulfur cathodes has been systematically investigated, revealing that the ZnFe2O4 host can improve the activity for Li2S deposition, facilitate lithium-ion diffusion, and lower the reaction energy barriers for the multistep phase transition of sulfur. As a result, the developed S@ZnFe2O4 composite cathodes exhibit an improved cycling capacity of 1158 mAh g−1. These results demonstrate that the accelerated redox conversion of anchored polysulfides is essential for enhancing the electrochemical performance of Li-S batteries.

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http://hdl.handle.net/10453/165383