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- W2951844752 abstract "Stable (c) and metastable (h) forms of Mg2Sn were prepared as crystallized phases by ball-milling of elemental powders. Through in situ X-ray diffraction measurements, we deduced the reactivity mechanisms of c-Mg2Sn toward lithium. It entails first a monophasic insertion of about one lithium per formula unit into the fcc Sn framework without extrusion of either Mg or Sn, then a biphasic process leading to the formation of cubic Li2MgSn concomitant with a progressive expulsion of Mg, and finally the formation of Li−Mg solid-solution alloys. Upon charging, the poor reversibility of the alloying reaction of Li with Mg leads to a deficit in free Mg, resulting in the formation of a Mg2Sn + Sn mixture, and accounting for the poor cyclability of Mg2Sn/Li cells over the 0.0−1.5 V voltage window. Limiting the cycling to the monophasic process was shown to improve the cycling behavior. Finally, we found that the electrochemical reaction of h-Mg2Sn with Li leads to the same Li2MgSn intermediate and the same subsequent sequence of transformations, resulting in similarly poor capacity retention upon cycling." @default.
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- W2951844752 date "2004-11-12" @default.
- W2951844752 modified "2023-10-06" @default.
- W2951844752 title "Electrochemical Reactivity of Mg<sub>2</sub>Sn Phases with Metallic Lithium" @default.
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- W2951844752 doi "https://doi.org/10.1021/cm040132h" @default.
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