Fan S

Hng HH

Lim LY

Pramana SS

Rui X

Samani MK

Tay BK

Tay YY

Toney MF

Yan Q

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. \ua9 2013 The Royal Society of Chemistry

Newcastle University E-Prints

Rapid fabrication of a novel Sn-Ge alloy: Structure-property relationship and its enhanced lithium storage properties

Rapid fabrication of a novel Sn-Ge alloy: Structure-property relationship and its enhanced lithium storage properties

Abstract

Similar works

Full text

Available Versions

Newcastle University E-Prints