Novel ionic liquids (ILs), which were functionalized with ether oxygens to suppress crystallization and with bis(fluorosulfonyl)imide (FSI) anions to improve ionic conductivity, were synthesized and compared. Electrolyte mixtures were prepared by adding LiFSI to N-ethoxyethyl-N-methylpiperidinium FSI ([P 1,2O2 ][FSI]) and N-ethoxyethyl-N-methylmorpholinium FSI ([M 1,2O2 ][FSI]) in ratio of 1:9 (mol/mol). The electrolyte mixtures were found to exhibit a glass transition temperature between −71 and −93 °C and a decomposition temperature higher than 266 °C. Between these temperatures, the electrolytes were ion conductive and thermally stable liquids. [P 1,2O2 ][FSI]-LiFSI exhibited a wider electrochemical stability window and possessed an ability to form solid electrolyte interfaces having a lower resistance compared to [M 1,2O2 ][FSI]-LiFSI. Based on these results, the Li | LiFePO 4 cells containing [P 1,2O2 ][FSI]-LiFSI as electrolytes were assembled and found to possess a high capacity, reaching to the nominal capacity 150 mAh g −1 at C/10. Moreover, the cell retained flat potential profiles throughout 50 cycles.

Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties / Tsurumaki, A.; Ohno, H.; Panero, S.; Navarra, M. A.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 293:(2019), pp. 160-165. [10.1016/j.electacta.2018.09.205]

Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties

Tsurumaki A.
;
Panero S.;Navarra M. A.
2019

Abstract

Novel ionic liquids (ILs), which were functionalized with ether oxygens to suppress crystallization and with bis(fluorosulfonyl)imide (FSI) anions to improve ionic conductivity, were synthesized and compared. Electrolyte mixtures were prepared by adding LiFSI to N-ethoxyethyl-N-methylpiperidinium FSI ([P 1,2O2 ][FSI]) and N-ethoxyethyl-N-methylmorpholinium FSI ([M 1,2O2 ][FSI]) in ratio of 1:9 (mol/mol). The electrolyte mixtures were found to exhibit a glass transition temperature between −71 and −93 °C and a decomposition temperature higher than 266 °C. Between these temperatures, the electrolytes were ion conductive and thermally stable liquids. [P 1,2O2 ][FSI]-LiFSI exhibited a wider electrochemical stability window and possessed an ability to form solid electrolyte interfaces having a lower resistance compared to [M 1,2O2 ][FSI]-LiFSI. Based on these results, the Li | LiFePO 4 cells containing [P 1,2O2 ][FSI]-LiFSI as electrolytes were assembled and found to possess a high capacity, reaching to the nominal capacity 150 mAh g −1 at C/10. Moreover, the cell retained flat potential profiles throughout 50 cycles.
2019
bis(fluorosulfonyl)imide; ether functionalizations; Ionic liquids; Lithium ion batteries; safety
01 Pubblicazione su rivista::01a Articolo in rivista
Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties / Tsurumaki, A.; Ohno, H.; Panero, S.; Navarra, M. A.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 293:(2019), pp. 160-165. [10.1016/j.electacta.2018.09.205]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1282901
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