METHOD OF SYNTHESIZING OF N-METHYL-N-TRIMETHYLSILYL TRIFLUOROACETAMIDE, N-METHYL-N-TRIMETHYLSILYL TRIFLUOROACETAMIDE SYNTHESIZED THEREBY AND AN ELECTROLYTE FOR LITHIUM SECONDARY BATTERY INCLUDING THE SAME

摘要

The present invention relates to a synthesis method of N-methyl-N-trimethylsilyl trifluoroacetamide (MSTFA), MSTFA synthesized thereby and an electrolyte for a lithium secondary battery including the same. The present invention comprises the steps of: preparing N-methyltrifluoroacetamide by using ethyltrifluoroacetate and methylamine; and obtaining MSTFA by separating and removing a precipitate from a reaction mixture obtained by introducing trimethylsilyl chloride to a mixture of N-methyltrifluoroacetamide and triethylamine. According to the present invention, since BSA (N,O-bis(trimethylsilyl)acetamide) is not used, it is relatively easy to remove a starting material and a side reaction material which are not reacted by fractional distillation. Therefore, it is possible to obtain a high-purity MSTFA of 99.0% or more and if the high-purity MSTFA of 99.0% or more is used as an additive of an electrolyte for a lithium secondary battery, it is possible to improve lifespan characteristics of a lithium secondary battery.