Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery

For ensuring safety of lithium ion batteries (LIBs), we have extensively investigated the quasi-solid electrolyte where lithium ion conducive liquid is quasi-solidified at silica surfaces as thermally durable electrolyte, and applied it to high capacity and high energy density LIB. For the liquid ph...

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Autores principales:	Takefumi OKUMURA, Jun KAWAJI
Formato:	article
Lenguaje:	EN JA
Publicado:	The Electrochemical Society of Japan 2021
Materias:	thermally durable electrolyte lithium ion battery high-energy battery quasi-solid-state electrolyte Technology T Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/2bb18012145b45b8b88d83aca4d0c37e
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spelling	oai:doaj.org-article:2bb18012145b45b8b88d83aca4d0c37e2021-11-05T00:17:27ZResearch and Development of Thermally Durable Electrolyte for Lithium Ion Battery2186-245110.5796/electrochemistry.21-00079https://doaj.org/article/2bb18012145b45b8b88d83aca4d0c37e2021-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/electrochemistry/89/6/89_21-00079/_html/-char/enhttps://doaj.org/toc/2186-2451For ensuring safety of lithium ion batteries (LIBs), we have extensively investigated the quasi-solid electrolyte where lithium ion conducive liquid is quasi-solidified at silica surfaces as thermally durable electrolyte, and applied it to high capacity and high energy density LIB. For the liquid phase, a solvate ionic liquid, which is an equimolar complex of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and tetraethylene glycol dimethyl ether (G4), Li(G4)TFSA, was used. For enhancing discharge capability at a higher rate, Li(G4)TFSA was diluted by low viscos solvent such as propylene carbonate (PC). The developed electrolyte possessed a favorable volatilization temperature higher than 373 K. A 100-Wh-class laminated LIB with energy density of 363 Wh L−1 was fabricated by employing the electrolyte to graphite-LiNixCoyMnzO2 chemistry, and it generated neither fire nor smoke in a nail-penetration test. The result suggest that the developed LIB has high safety compared to a LIB comprised of a conventional organic liquid electrolyte. In addition, to enhance the cycle life of the LIB, the formation and growth mechanism of a solid-electrolyte interphase on a graphite-based negative electrode was investigated. Nuclear magnetic resonance and hard x-ray photoelectron spectroscopy revealed that the decompositions of LiTFSA, PC, and G4 contributed to the SEI formation at the initial charge, and that continuous decompositions of G4 and PC were a major reason for the SEI growth during charge-discharge cycles. Based on these analysis, we have substituted a highly concentrated sulfolane based liquid which exhibits a high Li ion conductivity with less amount of the low viscos solvent, for the G4 based liquid. The modification effectively improved the electrochemical durability of the electrolyte, leading to a higher capacity retention after charge-discharge cycle test.Takefumi OKUMURAJun KAWAJIThe Electrochemical Society of Japanarticlethermally durable electrolytelithium ion batteryhigh-energy batteryquasi-solid-state electrolyteTechnologyTPhysical and theoretical chemistryQD450-801ENJAElectrochemistry, Vol 89, Iss 6, Pp 507-517 (2021)
institution	DOAJ
collection	DOAJ
language	EN JA
topic	thermally durable electrolyte lithium ion battery high-energy battery quasi-solid-state electrolyte Technology T Physical and theoretical chemistry QD450-801
spellingShingle	thermally durable electrolyte lithium ion battery high-energy battery quasi-solid-state electrolyte Technology T Physical and theoretical chemistry QD450-801 Takefumi OKUMURA Jun KAWAJI Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
description	For ensuring safety of lithium ion batteries (LIBs), we have extensively investigated the quasi-solid electrolyte where lithium ion conducive liquid is quasi-solidified at silica surfaces as thermally durable electrolyte, and applied it to high capacity and high energy density LIB. For the liquid phase, a solvate ionic liquid, which is an equimolar complex of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and tetraethylene glycol dimethyl ether (G4), Li(G4)TFSA, was used. For enhancing discharge capability at a higher rate, Li(G4)TFSA was diluted by low viscos solvent such as propylene carbonate (PC). The developed electrolyte possessed a favorable volatilization temperature higher than 373 K. A 100-Wh-class laminated LIB with energy density of 363 Wh L−1 was fabricated by employing the electrolyte to graphite-LiNixCoyMnzO2 chemistry, and it generated neither fire nor smoke in a nail-penetration test. The result suggest that the developed LIB has high safety compared to a LIB comprised of a conventional organic liquid electrolyte. In addition, to enhance the cycle life of the LIB, the formation and growth mechanism of a solid-electrolyte interphase on a graphite-based negative electrode was investigated. Nuclear magnetic resonance and hard x-ray photoelectron spectroscopy revealed that the decompositions of LiTFSA, PC, and G4 contributed to the SEI formation at the initial charge, and that continuous decompositions of G4 and PC were a major reason for the SEI growth during charge-discharge cycles. Based on these analysis, we have substituted a highly concentrated sulfolane based liquid which exhibits a high Li ion conductivity with less amount of the low viscos solvent, for the G4 based liquid. The modification effectively improved the electrochemical durability of the electrolyte, leading to a higher capacity retention after charge-discharge cycle test.
format	article
author	Takefumi OKUMURA Jun KAWAJI
author_facet	Takefumi OKUMURA Jun KAWAJI
author_sort	Takefumi OKUMURA
title	Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
title_short	Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
title_full	Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
title_fullStr	Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
title_full_unstemmed	Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery
title_sort	research and development of thermally durable electrolyte for lithium ion battery
publisher	The Electrochemical Society of Japan
publishDate	2021
url	https://doaj.org/article/2bb18012145b45b8b88d83aca4d0c37e
work_keys_str_mv	AT takefumiokumura researchanddevelopmentofthermallydurableelectrolyteforlithiumionbattery AT junkawaji researchanddevelopmentofthermallydurableelectrolyteforlithiumionbattery
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Research and Development of Thermally Durable Electrolyte for Lithium Ion Battery

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