✦ LIBER ✦

Mixtures of ionic liquid and organic carbonate as electrolyte with improved safety and performance for rechargeable lithium batteries

✍ Scribed by R.-S. Kühnel; N. Böckenfeld; S. Passerini; M. Winter; A. Balducci

Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 455 KB
Volume: 56
Category: Article
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2011.01.116

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✦ Synopsis

In this paper we report the results of physical-chemical and electrochemical investigations performed on ternary mixtures of the room temperature ionic liquid (IL) N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 14 TFSI), propylene carbonate (PC), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as electrolyte for lithium-ion batteries. The thermal stability, ionic conductivity, viscosity and electrochemical stability windows of all considered mixtures were investigated and compared with those of electrolytes based on the pure PYR 14 TFSI and PC. The mixtures were also used as electrolyte in combination with LiFePO 4 -based electrodes. The specific capacity and cycling stability of these systems were investigated at different C-rates, both at room temperature and 60 • C.

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