Amorphous and nanocrystalline Mg2Si thin-film electrodes

Amorphous and nanocrystalline Mg2Si thin-film electrodes

TitleAmorphous and nanocrystalline Mg2Si thin-film electrodes
Publication TypeJournal Article
Year of Publication2003
AuthorsSeung-Wan Song, Kathryn A Striebel, Xiangyun Song, Elton J Cairns
JournalJournal of Power Sources
Volume119-121
Pagination110-112
Date Published06/2003
ISSN03787753
Keywordsnanocrystalline, pulsed laser deposition, thin-film electrodes
Abstract

Mg2Si films, prepared by pulsed laser deposition (PLD), were amorphous, as prepared, and nanocrystalline following annealing. Their micro-structure and electrochemical characteristics were studied by high-resolution transmission electron microscopy (HRTEM) and electrochemical cycling against lithium. HRTEM analysis revealed that some excess Si was present in the films. The more amorphous thinner film exhibited excellent cyclability. However, when the film becomes crystalline, the irreversible capacity loss was more significant during the initial cycling and after ∼50 cycles. Interpretations of the superior stability of the amorphous films are examined.

DOI10.1016/S0378-7753(03)00135-6
Short TitleJournal of Power Sources