Phase-separation-driven formation of Nickel–Cobalt oxide nanotubes as high-capacity anode materials for lithium-ion batteries

摘要

Nickel–Cobalt oxide nanotubes are prepared by a simple electrospinning technique based on a phase-separation mechanism. Extra tetraethyl orthosilicate (Si(OC_(2)H_(5))_(4)) is introduced and removed by design to obtain nanotube structure. The prepared nanotubes deliver remarkable electrochemical performance as the lithium-ion batteries anode materials. It possesses a capacity of 924?mAh/g after 95 cycles at 100?mA/g. At 2000?mA/g, it has a high capacity of 770?mAh/g, and still has 255?mAh/g at 1000?mA/g after 500 cycles. The outstanding electrochemical performance is attributed to the unique hierarchical tubular nanostructures design. This simple method opens new opportunities for fabricating practical nanostructured anode materials.