fig4

Figure 4. 1st discharge-charge curves (A), cycling performance at different rates (B and C), and reversible capacity vs. current density dependence (D) of Li/Si cells in 0.2LiTFSI-0.8EMIFSI, 0.2LiFSI-0.8EMIFSI, and 0.2LiFSI-0.8N₁₁₁₄FSI electrolytes. The cycling behavior of Li/Si cells in organic electrolytes (1M LiPF₆ in EC:DMC 1:1 v:v 3 wt.% FEC) is reported for comparison purposes. T = 20 °C.