N-Allyl-N-Methyl Piperidinium Bis(Trifluoromethanesulfonyl) Imide as a Co-Solvent in Li-Ion Batteries

Mixtures of an ionic liquid (IL) with organic solvents and a lithium salt have been studied in order to develop new electrolytes for lithium-ion cells with enhanced safety profiles. In this work, N-allyl-N-methylpiperidinium bis (trifluoromethanesulfonyl) imide (PP 1A TFSI) was synthesized and characterized to exhibit high decomposition temperature and wide electrochemical stability window. The evaluation of the coin cell LiFePO 4 /Li with the mixed electrolyte based on PP 1A TFSI with 0.35mol/kg LiTFSI, and 30 wt% VC/DMC (1:1) shows a nice reversibility and cycle performances. All above prove that PP 1A TFSI is one of the most promising safety electrolytes of Li-ion battery.