A new generation of boronic ionic liquid namely 1-ethyl-3-methylimidazolium difluoro(oxalate)borate (EMImDFOB) was synthesized by metathesis reaction between 1-ethyl-3-methylimiazolium bromide and lithium difluoro(oxalate)borate (LiDFOB). Ternary gel polymer electrolyte membranes were prepared using electrolyte mixture EMImDFOB/LiDFOB with poly vinylidenefluoride-co-hexafluoropropylene (PVdF-co-HFP) as a host matrix by facile solvent-casting method and plausibly demonstrated its feasibility to use in lithium ion batteries. Amongst ternary gel electrolyte membrane, DFOB-GPE3, which contained 80 wt% of EMImDFOB/LiDFOB and 20 wt% PVdF-co-HFP, showed excellent electrochemical and cycling behaviors. The highest ionic conductivity was found to be 10 Scm at 378 K. Charge-discharge profile of Li/DFOB-GPE3/LiCoO coin cell displayed a maximum discharge capacity of 148.4 mAhg at C/10 rate with impressive capacity retention capability and columbic efficiency at 298 K.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5593839PMC
http://dx.doi.org/10.1038/s41598-017-11614-1DOI Listing

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