The Mechanism of SEI Formation on Single Crystal Si(100), Si(110) and Si(111) Electrodes

The Mechanism of SEI Formation on Single Crystal Si(100), Si(110) and Si(111) Electrodes

TitleThe Mechanism of SEI Formation on Single Crystal Si(100), Si(110) and Si(111) Electrodes
Publication TypeJournal Article
Year of Publication2015
AuthorsUlrike S Vogl, Simon F Lux, Prodip K Das, Adam Z Weber, Tobias Placke, Robert Kostecki, Martin Winter
JournalJournal of The Electrochemical Society
Volume162
Issue12
PaginationA2281 - A2288
Date Published09/2015
ISSN0013-4651
Keywordselectrolyte additives, FEC, ftir, Lithium ion battery, SEI, silicon, single crystal Si, VC, XPS
Abstract

Subsequent to our previous studies on the SET formation mechanism on the single crystal silicon (100) surface, here we report on complementary studies of the SET formation on Si surfaces with the crystal orientations (111) and (110). The differences in electrochemical behavior of the different crystal orientations are discussed - especially with regard to the effect of the SET forming electrolyte additives fluoroethylene carbonate (FEC) and vinylene carbonate (VC) added to ethylene carbonate (EC)/diethyl carbonate (DEC) based electrolytes. Fourier transform infrared spectroscopy (FUR) of the SET during early stages of SET formation and physico-chemical investigations (wetting behavior) indicate a strong dependence of the chemical composition of the SET on the surface orientation and the electrolyte composition during the early stages of lithiation of Si. However, at a higher lithiation degree less difference in the chemical composition of the SET can be observed. These findings are in agreement with those made for the SEI formation on the Si(100) surface.

DOI10.1149/2.0361512jes
Short TitleJ. Electrochem. Soc.