TY - JOUR
T1 - Rapid fabrication of a novel Sn-Ge alloy
T2 - Structure-property relationship and its enhanced lithium storage properties
AU - Fan, Shufen
AU - Lim, Linda Y.
AU - Tay, Yee Yan
AU - Pramana, Stevin Snellius
AU - Rui, Xianhong
AU - Samani, Majid Kabiri
AU - Yan, Qingyu
AU - Tay, Beng Kang
AU - Toney, Michael F.
AU - Hng, Huey Hoon
PY - 2013/12/14
Y1 - 2013/12/14
N2 - 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.
AB - 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.
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U2 - 10.1039/c3ta13315j
DO - 10.1039/c3ta13315j
M3 - Article
AN - SCOPUS:84887232102
SN - 2050-7488
VL - 1
SP - 14577
EP - 14585
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 46
ER -
