Mechanism of Lithium Insertion into Magnesium Silicide

Mechanism of Lithium Insertion into Magnesium Silicide

TitleMechanism of Lithium Insertion into Magnesium Silicide
Publication TypeJournal Article
Year of Publication2004
AuthorsGregory A Roberts, Elton J Cairns, Jeffrey A Reimer
JournalJournal of The Electrochemical Society
Volume151
Issue4
PaginationA493-A496
ISSN00134651
Keywordsintercalation compounds, lithium alloys, magnesium alloys, mechanical alloying, nuclear magnetic resonance, silicon alloys, x-ray diffraction
Abstract

The reaction mechanism for electrochemical lithium insertion into magnesium silicide was studies by in situ and ex situ X-ray diffraction (XRD). Lithium intercalation during the initial stages of insertion was indicated by a slight shift toward lower angles in the diffraction patterns. Upon further insertion, Li2MgSi was formed. This was indicated by the appearance of magnesium peaks, the disappearance of Mg2Si peaks, and the appearance of Li2MgSi peaks in the diffraction patterns. Magnesium XRD peaks that accumulated during cycling indicated that the formation of Mg2Si during lithium removal was not entirely reversible. Li2MgSi was synthesized by mechanical alloying. XRD patterns and nuclear magnetic resonance spectra of the mechanically alloyed and electrochemically produced phases are compared.

DOI10.1149/1.1649753
Short TitleJ. Electrochem. Soc.