Mixtures of ionic liquid and organic carbonate as electrolyte with improved safety and performance for rechargeable lithium batteries
2011; Elsevier BV; Volume: 56; Issue: 11 Linguagem: Inglês
10.1016/j.electacta.2011.01.116
ISSN1873-3859
AutoresRuben‐Simon Kühnel, Nils Böckenfeld, Stefano Passerini, Martin Winter, Andrea Balducci,
Tópico(s)Advancements in Battery Materials
ResumoIn 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 (PYR14TFSI), 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 PYR14TFSI and PC. The mixtures were also used as electrolyte in combination with LiFePO4-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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