Fig. 4. Mechanical properties of SEI.
a, b Derjaguin–Muller–Toporov (DMT) modulus mappings of (a) SD-SEI, (b) F-SEI, and (c) c-SEI. d–f Force-displacement curves obtained on the (d) SD-SEI, (e) F-SEI, and (f) c-SEI. g–i Cross-sectional images of scanning electron microscopy (SEM) images of Si electrodes after 100 cycles in GBL-based electrolyte (g), PC-based electrolyte (h), and EC-based electrolyte (i). Source data in d–f are provided as a Source data file.