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.