CoO/NiSix core–shell nanowire arrays as lithium-ion anodes with high rate capabilities

Abstract

This paper describes a facile chemical vapor deposition (CVD) and subsequent radio-frequency (RF)-sputtering approach for the synthesis of CoO/NiSi_x core–shell nanowire (NW) arrays on Ni foams. The metallic core (i.e., NiSi_x) with high conductivity acts as a nanostructured current collector. The as-synthesized CoO/NiSi_x core–shell NW arrays have been applied as anode materials for lithium-ion batteries, which deliver high cycle life and enhanced power performance compared to planar CoO electrodes on Ni foams. The high surface-to-volume ratio and improved electronic/ionic conductivity of the nanostructured electrodes may be responsible for the improved performance.