Understanding the Spontaneous Reactions between Oxide-Free Silicon and Lithium-Battery Electrolytes. Issue 10 (18th June 2019)

• Record Type: Journal Article
• Authors: Peled, E.; Schneier, D.; Shaham, Y.; Ardel, G.; Burstein, L.; Kamir, Y.
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 10(2019)
• Page Start: A2091
• Page End: A2095
• Publication Date: 2019-06-18
• Subjects: Batteries -- Passivity -- Silicon -- Electrolytes -- SEI -- Silicon; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1181910jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Here, we studied for the first time the kinetics of the chemical reactions between oxide-free silicon and electrolytes and the composition and morphology of the surface film formed during these reactions. We found that the kinetics of these reactions is swift; a few nm passivating film is formed during a few milliseconds and a complete passivation takes place in about 30 seconds. XPS study show a passivating film consisting of large organic molecules or polymers containing C-O, C=O, C-Fx and O-C-F moieties, SiFx, SiOx Fy, some SiO2 and small amounts of LiF. Containing only traces of Li, it cannot serve as an SEI and may lead to lesser uniformity of the SEI formed on top of it.