Synthesis of NixSiy–SiGe core–shell nanowire arrays on Ni foam as a high-performance anode for Li-ion batteries

Abstract

We demonstrate the large-area synthesis of NixSiy–SiGe core–shell nanowire arrays on a Ni foam via chemical vapor deposition and subsequent co-sputtering methods. When used as the anode of Li-ion batteries, the NixSiy–SiGe nanowire arrays show high reversible capacity and good rate capability compared to planar SiGe layers and NixSiy–Si core–shell nanowires. The good adhesion and contact of the core–shell nanowires with the current collector, and the integration of Ge which can greatly improve the conductivity and lithium-ion-diffusivity in the SiGe layer, may be responsible for the enhanced performance.