Lookup NU author(s): Dr Stevin Pramana
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A rapid solidification and high throughput melt spinning process is developed for the fabrication of new Sn-Ge alloys as anodes for high capacity lithium-ion batteries. Compared to pure micron-sized Sn and Ge, the alloy possesses enhanced lithium storage properties. High, reversible and stable capacities of over 1000 mA h g-1 are maintained over 60 cycles at 0.1 C. A good rate capability of 500 mA h g-1 at 5 C is also achieved, making it very attractive for very fast charge/discharge applications. More remarkably, it has a tap density of 2.05 g cm-3 and thus high volumetric capacities of 2050 mA h cm-3 at 0.1 C and 1025 mA h cm-3 at 5 C. The electrode was investigated via ex situ XRD, EXAFS and TEM at various cut-off voltages during the first cycle and after the first cycle to establish the structure-property relationship. The Sn-Ge alloy is observed to undergo a transformation from the crystalline Sn-Ge alloy into phase separated nanocrystalline Sn in an amorphous Ge matrix. The excellent lithium storage properties exhibited by Sn-Ge are attributed to the synergistic effect between the phases and the phase transformation occurred. © 2013 The Royal Society of Chemistry.
Author(s): Fan S, Lim LY, Tay YY, Pramana SS, Rui X, Samani MK, Yan Q, Tay BK, Toney MF, Hng HH
Publication type: Article
Publication status: Published
Journal: Journal of Materials Chemistry A
Print publication date: 14/12/2013
Online publication date: 01/10/2013
ISSN (print): 2050-7488
ISSN (electronic): 2050-7496
Publisher: Royal Society of Chemistry
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