Charge and Discharge Property of Li/LiCoO_2 Cell Using Ionic Liquids Composed of N,N-Diethyl-N-methyl-N-(2-methoxyethyl)arnmonium and fluorosulfonyl (trifluoromethylsulfonyl) amide

摘要

The rate property of Li/LiCoO_2 cell using ionic liquids (ILs) containing fluorosulfonyl(trifluoromethylsulfonyl) amide (FTA~-) anion and N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium (DEME~+) was investigated, comparing with corresponding amide ionic liquids composed of such bis(trifluoromethyl)sulfonylamide (TFSA~-) and bis(fluoromethylsulfonyl)amide (FSA~-). As a result, the cell using DEME[FTA] was also exhibit good rate performance as in the case of DEME[FSA]. This result suggests that an existence of FSO2 group in anionic species might be a key factor to improve the battery performance containing neat ILs.