I assembled four Li ion full cells with graphite and LiFePO4 as an anode and cathode materials, respectively. The organic electrolyte included 1M LiPF6 in EC/DMC was our blank electrolyte. The Ionic liquid by weight ratio of 2, 4, and 6 was used as the electrolyte additive. Among the different samples with 0, 2, 4, and 6 wt% IL, the best electrochemical performance at room temperature was observed for the cell containing 4 wt% IL and it had similar cyclic behavior to the blank electrolyte. The relatively similar cyclic performance was observed for the cell containing 2 and 6 wt% too. However, before this experiment, we guessed that the blank cell and the cell containing 2 wt% IL should have similar electrochemical performance. I do not find a rational explanation for this behavior in the literature. Can anyone help me about that?
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