Table 2. Evolution of Relative Concentrations of Specific Contributions, from the SEI and from the Active Material, As a Function of Cycle Number (produced from XPS data).
| comp (at %)a | C | Li-F | F-Li | O | P | Si |
|---|---|---|---|---|---|---|
| 1 lith.* | 17.3 | 30.4 | 27.3 | 21.3 | 2.5 | 1.2 |
| 1 delith.* | 37.1 | 17.1 | 17.6 | 23.9 | 2.3 | 2 |
| 10 lith. | 19.1 | 30.2 | 29.4 | 18.1 | 1.9 | 1.3 |
| 10 delith. | 19 | 32 | 30.3 | 15.5 | 2 | 1.2 |
| 100 lith. | 78 | 0 | 0 | 18.9 | 0 | 3.1 (LixSiOx) |
| 100 delith. | 75.6 | 0 | 0 | 18.5 | 0 | 5.9 (LixSiOx) |
a
“x (de)lith.” means “after x electrochemical cycle, at the end of (de)lithiation”