An Electrochemical and XRD Study of Lithium Insertion into Mechanically Alloyed Magnesium Stannide

Publication Type
Journal Article
Authors
DOI
10.1149/1.1578477
Abstract

The intermetallic Mg2Sn is a promising negative electrode material for rechargeable lithium cells. Preliminary cycling tests have demonstrated stable capacities at 400 mAh/g for 20 cycles. Magnesium stannide was produced by mechanically alloying magnesium and tin powders. Mechanical alloying can convert the equilibrium Mg2Sn phase to a metastable phase by the introduction of defects with extended milling times. In situ X-ray diffraction has shown that the cubic Li2MgSn phase, which is similar in size and structure to cubic Mg2Sn, is produced by lithium insertion into the equilibrium and metastable phases. The conversion from the metastable phase is irreversible, so subsequent lithium removal from Li2MgSn produces the equilibrium Mg2Sn phase.

Journal
Journal of The Electrochemical Society
Volume
150
Year of Publication
2003
Issue
7
Pagination
A912-A916
ISSN Number
00134651
Short Title
J. Electrochem. Soc.
Keywords
Organizations
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