Ni3Si2–Si nanowires on Ni foam as a high-performance anode of Li-ion batteries

We demonstrate the large-area synthesis of Ni3Si2-supported Si (Ni3Si2–Si) nanowires on the surface of a Ni foam via a simple and rich-yield chemical vapor deposition and subsequent rf-sputtering method. When used as an anode of Li-ion batteries, the Ni3Si2–Si nanowires show a high reversible capacity of ~ 1800 and ~1600 mA h g− 1 at a high current rate of 1C and 2C during 100 cycles, respectively. The good contact, adhesion and conductivity of Ni3Si2–Si nanowires with the current collectors during the charge–discharge process may be responsible for the good performance.

► Large-area Ni3Si2–Si nanowires on Ni foam were synthesized.
► The Ni3Si2–Si nanowires show high-rate capacity as anode of Li-ion batteries.
► The high-rate capacity is due to the good contact, adhesion and conductivity.