Revealing the chemistry of an anode-passivating electrolyte salt for high rate and stable sodium metal batteries

Gao, L; Chen, J; Liu, Y; Yamauchi, Y; Huang, Z; Kong, X

Revealing the chemistry of an anode-passivating electrolyte salt for high rate and stable sodium metal batteries

Gao, L Chen, J Liu, Y Yamauchi, Y Huang, Z

Kong, X

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Publication Type:: Journal Article
Citation:: Journal of Materials Chemistry A, 2018, 6 (25), pp. 12012 - 12017
Issue Date:: 2018-01-01

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Field	Value	Language
dc.contributor.author	Gao, L	en_US
dc.contributor.author	Chen, J	en_US
dc.contributor.author	Liu, Y	en_US
dc.contributor.author	Yamauchi, Y	en_US
dc.contributor.author	Huang, Z https://orcid.org/0000-0003-1985-0884	en_US
dc.contributor.author	Kong, X	en_US
dc.date.issued	2018-01-01	en_US
dc.identifier.citation	Journal of Materials Chemistry A, 2018, 6 (25), pp. 12012 - 12017	en_US
dc.identifier.issn	2050-7488	en_US
dc.identifier.uri	http://hdl.handle.net/10453/130910
dc.description.abstract	© The Royal Society of Chemistry 2018. Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating.	en_US
dc.relation.ispartof	Journal of Materials Chemistry A	en_US
dc.relation.isbasedon	10.1039/c8ta03436b	en_US
dc.title	Revealing the chemistry of an anode-passivating electrolyte salt for high rate and stable sodium metal batteries	en_US
dc.type	Journal Article
utslib.citation.volume	25	en_US
utslib.citation.volume	6	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
pubs.embargo.period	Not known	en_US
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	closed_access
pubs.issue	25	en_US
pubs.publication-status	Published	en_US
pubs.volume	6	en_US

Abstract:

© The Royal Society of Chemistry 2018. Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating.

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http://hdl.handle.net/10453/130910