Effects of Solvation Structures on the Co-intercalation Suppression Ability of the Solid Electrolyte Interphase Formed on Graphite Electrodes

The effect of solvation structures on solvated Li+ migration in a solid electrolyte interphase (SEI) was investigated using glyme-solvated Li+ as probes for co-intercalation reactions. The intercalation of bare Li+ into graphite occurred in the presence of the SEI derived from vinylene carbonate and when butyl methyl triglyme was the solvent. Based on the results of density functional theory calculations, both the size of solvated Li+ and the width of the ionic path of SEIs are crucial to determine whether Li+ is desolvated.