A Detailed Study of the (Electro)chemical Behavior of Bis(trifluoromethanesulfonyl)imide Based Ionic Liquids at Different Purification Steps

A systematic investigation of the major impurities content as well as of their effect on the electrochemical behavior of synthesized N-butyl-N-methylpyrrolidinium (Py1.4), N-(2-methoxyethyl)-N-methylpyrrolidinium (Py1.102) and 1-butyl-3-methylimidazolium (bmim) bis(trifluoromethanesulfonyl)imide has been carried out and the efficacy of an optimized multistep purification protocol for obtaining ILs suitable for electrochemical applications has been verified.