A novel Co–Li2O@Si core–shell nanowire array composite as a high-performance lithium-ion battery anode material

Abstract

We report a novel material of Co–Li₂O@Si core–shell nanowire array synthesized via the lithiation of pre-synthesized CoO@Si core–shell nanowire arrays during the first cycle. When the potential window versus lithium was controlled between 0.01–1.2 V, the coated Si shell could be electrochemically active, while the Co–Li₂O nanowire core could function as a stable mechanical support and an efficient electron conducting pathway during the charge–discharge process. The Co–Li₂O@Si core–shell nanowire array anodes exhibit good cyclic stability and high power capability compared to planar Si film electrodes.