Mixtures of ionic liquid-Alkylcarbonates as electrolytes for safe lithium-ion batteries

TitleMixtures of ionic liquid-Alkylcarbonates as electrolytes for safe lithium-ion batteries
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2013
AuthorsLombardo, L., Brutti S., Navarra M.A., Panero S., and Reale P.
JournalJournal of Power Sources
KeywordsAccident prevention, Alkylcarbonate, battery, Carbonate-based electrolytes, Carbonation, Electrochemical stabilities, Electrodes, Electrolyte mixtures, Electrolytes, Galvanostatic cycling, Ionic liquids, Lithium, Lithium batteries, Lithium-ion battery, Mixtures, Nbutyl-n-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide

Mixtures of alkylcarbonate electrolytes with an ionic liquid (IL) and a lithium salt have been studied in order to develop new electrolytes for lithium-ion cells with enhanced safety profiles. In this work the influence of the addition of N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Py14TFSI) on the electrochemical properties of commercial carbonate-based electrolytes, i.e. 1 M LiPF6 in EC:DMC (LP30) and in EC:DMC:DEC (LP71) is reported. Four new electrolyte compositions have been prepared and characterized. The addition of the ionic liquid in the electrolyte carbonate-based solution results in (i) an ionic conductivity comparable with that of the pristine IL-free carbonate-based electrolyte, (ii) the enlargement of the electrochemical stability window, and (iii) a large reduction of the self-extinguish time (SET) of the electrolyte mixture when exposed to a free flame. All the newly developed electrolytes have been tested in lithium cells versus LiFePO4 and Li4Ti5O12 electrodes: the cells show good performances in galvanostatic cycling. The best performing electrolyte i.e. LP30/Py14TFSI 70/30 wt/wt has been also successfully tested in a full Li-ion cell realized by coupling LiFePO 4 and Li4Ti5O12 electrodes. © 2012 Elsevier B.V. All rights reserved.


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