2. Results and discussion
The Cu||Li half-cell test was electrochemically cycled
to understand polarization, capacity retention, and CE. The cyclic CE
indicates the rate of Li consumption during the Li plating/stripping
process and the degree of electrolyte decomposition. The electrochemical
performance of Cu||Li cell cycled at 0.5
mA·cm-2 with the plating stripping capacity of 2
mAh·cm-2 is shown in Figure 1a. Figure 1b and c
illustrates the polarization voltages of the cells with E1 and E2
electrolytes, respectively. The cells with E2 electrolyte charged and
discharged at 0.5 mA·cm-2 show a 22 mV and 29 mV
polarization voltage for the 2nd and
10th cycles, respectively.