Electrochemical and cycling performances of novel nonafluorobutanesulfonate (nonaflate) ionic liquid based ternary gel polymer electrolyte membranes for rechargeable lithium ion batteries

A new-fangled nonaflate anion based ionic liquid ternary gel polymer electrolytes was prepared and their function as an active separator for lithium ion battery applications has been characterized. The ionic liquid gel polymer electrolytes (IGPEs) were prepared using facile solution cast technique by incorporating electrolyte mixtures such as lithium nonafluorobutanesulfonate (LiNfO) and 1-butyl-3-methylimidazolium nonafluorobutanesulfonate (BMImNfO) in poly vinylidenefluoride-co-hexafluoropropylene (PVdF-co-HFP) matrix. The electrochemical performance and the interactions between PVdF-co-HFP, LiNfO and imidazolium-based ionic liquid BMImNfO are comparatively investigated. IGPEs obey Arrhenius relation and its ionic conductivity is found to be maximum of 10−2Scm−1 at 100°C. At low current rate, IGPE also exhibits good cycling performance with LiCoO2 and achieved a maximum discharge capacity of 138.1mAhg−1. A new class of nonflate anion based ionic liquid gel polymer electrolytes were synthesized and exploited for the application of high performance rechargeable lithium ion battery as electrolyte. [Display omitted] •1-Butyl-3-methylimidazolium nonflate ionic liquid has been synthesized and reported first time.•Different compositions of gel electrolytes have prepared using synthesized ionic liquid.•At 373K, the gel polymer electrolyte IGPE3 achieves a high ionic conductivity of 10−2Scm−1.•Among the prepared electrolytes, IGPE3 (80% LiNfO/IL) delivers a high discharging capacity of 138.1mAh/g.