Abstract
A charge–discharge cycling test of a Li/LiCoO 2 cell containing ionic liquids based on bis(fluorosulfonyl)imide ([FSI] −) as the electrolyte media, revealed significantly better rate properties compared to those of cells using conventional ionic liquids. The use of an 1-ethyl-3-methylimidazolium (EMI +) salt permitted the retention of 70% of the discharge capacity at a 4 C current rate. In contrast, similar performance of cells containing N-methyl- N-propylpyrrolidinium (Py 13 +) and N-methyl- N-propylpiperidinium (PP 13 +) salts of [FSI] − was limited to operation at 2 and 1 C current rates, respectively. However, the charge/discharge cycling stability of the cell with Py 13[FSI] was much better than that of the cell using EMI[FSI].
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