Peer-Reviewed Journal Details
Mandatory Fields
Garcia-Gil, A.; Biswas, S.; McNulty, D.; Roy, A.; Ryan, K. M.; Nicolosi, V.; Holmes, J. D.
Advanced Materials Interfaces
High Aspect-ratio Germanium-Tin Alloy Nanowires: Potential as Highly Efficient Li-Ion Battery Anodes
Optional Fields
germanium-tin nanowires Li-ion battery anode super-thin nanowires supercritical growth conditions
2201170 (1)
2201170 (12)
Here, the fabrication of a high aspect ratio (>440) Ge1-xSnx nanowires with super-thin (9nm) diameter, much below the Bohr radius, using a simple solvothermal-like growth method under supercritical toluene conditions at a reaction temperature of 440 C is reported. Ge1-xSnx nanowires are grown with varying amounts of Sn in Ge lattice, between 3.1 to 10.2 at%. The growth of the Ge1-xSnx alloy nanowires is achieved without any additional catalysts, and directly on current collector substrates (titanium) for application as Li-ion battery anodes. The electrochemical performance of the binder-free Ge1-xSnx nanowires as an anode material for Li-ion batteries is investigated via galvanostatic cycling and detailed analysis of differential capacity plots. The dimensions of the nanowires, and the amount of Sn in Ge, are critical to achieving a high specific capacity and capacity retention. Ge1-xSnx nanowires with the highest aspect ratios and with the lowest Sn content (3.1at%) demonstrate exceptional capacity retention of 90% and 86% from the 10th to the 100th and 150th cycles respectively, while maintaining a very high specific capacity value of 1176 and 1127mAhg-1 after the 100 and 150 cycles respectively.
New jersey, USA
Grant Details