Ionic conduction in polyether-based lithium arylfluorosulfonimide ionic melt electrolytes

✍ Scribed by Mahesha B. Herath; Stephen E. Creager; Rama V. Rajagopal; Olt E. Geiculescu; Darryl D. DesMarteau

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 778 KB
• Volume: 54
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2009.05.050

✦ Synopsis

We report synthesis, characterization and ion transport in polyether-based ionic melt electrolytes consisting of Li salts of low-basicity anions covalently attached to polyether oligomers. Purity of the materials was investigated by HPLC analysis and electrospray ionization mass spectrometry. The highest ionic conductivity of 7.1 × 10 -6 S/cm at 30 • C was obtained for the sample consisting of a lithium salt of an arylfluorosulfonimide anion attached to a polyether oligomer with an ethyleneoxide (EO) to lithium ratio of 12. The conductivity order of various ionic melts having different polyether chain lengths suggests that at higher EO:Li ratios the conductivity of the electrolytes at room temperature is determined in part by the amount of crystallization of the polyether portion of the ionic melt.