ID 5288
File
Authors
Keywords
FeSi2/Si composite
Ferrosilicon
Li-ion battery anode
Mechanical grinding
Gas-deposition
Abstract
We prepared composite electrodes of iron silicide/Si by using mechanical grinding for mixtures of ferrosilicon and Si followed by gas-deposition, and investigated their electrochemical properties as Li-ion battery anode. With increasing the mechanical grinding time, the phase transformation from FeSi to FeSi2 took place more significantly, and the composite electrode showed better cycle stabilities. There was no remarkable difference in mechanical properties and electronic conductivity between FeSi and FeSi2. On the other hand, the FeSi2 exhibited about three times larger capacities in comparison with the FeSi electrode. In addition, a result of our first principle calculation indicates that Li ion can diffuse more easily in FeSi2 lattice than in FeSi lattice. It is suggested that the better cyclability of the composite electrodes was attributed to the moderate reactivity of FeSi2 with Li and the smooth Li-ion diffusion in it.
Publisher
Elsevier
Content Type
Journal Article
Link
ISSN
0378-7753
NCID
AA1153408X
Journal Title
Journal of power sources
Current Journal Title
Journal of power sources
Volume
268
Start Page
848
End Page
852
Published Date
2014-12-05
Publisher-DOI
Text Version
Author
Rights
Copyright © 2014 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Citation
Journal of power sources. 2014, 268, 848-852
Department
Faculty of Engineering/Graduate School of Engineering
Language
English