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Chapter 4: Li2S electrode (a) (b) (c) (d) Figure 4-35. Comparison of galvanostatic cycling performances of Li2S positive electrode (active material loading of 2.14 mgLi2S cm-2) cycled at C/20 with two different negative electrodes: Si (in red) and Li (in black). Initial charge (a), initial discharge (b), second charge (c) and capacity retention (d) for both cells is shown. Cut-off voltage limits during 1st charge – 1st discharge – 2nd charge are as follow: 4.0 V – 1.7 V – 3.0 V (for Li/Li2S cell) and 3.5 V – 1.0 V – 2.6 V (for Si/Li2S cell). Li2S electrodes display very high initial polarization during charge. This overpotential is clearly visible for both cells, no matter the negative electrode used (Figure 4-35a). This non- reproducible charge profile was carefully investigated in previous section 4.2.4 a. As discussed before, this large polarization has no detrimental effect on the cell capacity. Si/Li2S cell shows a high charge capacity, even extending the theoretical value of 1166 mAh/gLi2S. This high capacity can be associated with some shuttle mechanism, but further experiments must be performed to have a clear idea about that. During 1st discharge, Si/Li2S cell displays lower capacity (438 mAh gLi2S-1) as compared to the Li/Li2S cell (616 mAh gLi2S-1). The lower discharge capacity may be related to the irreversible consumption of lithium during the SEI formation on Si. Contrarily to the lithium negative electrode, Si indeed does not play the role of lithium reserve. Besides, the average working voltage is lower (1.7 V) than for Li/Li2S cell 153PDF Image | Accumulateur Lithium Soufre
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