Nanotubes of Core/Shell Cu/Cu[sub 2]O as Anode Materials for Li-Ion Rechargeable Batteries

A direct electrodeposition technique for Cu nanotube array fabrication and the subsequent conversion of the deposited Cu into Cu 2 O was developed. The Cu 2 O nanotube arrays showed high capacity, cyclability, and rate capability. The cycling performance of the Cu 2 O nanotubes showed a high level of structural integrity with capacity retention even after 94 cycles when cycled at 1C to 3C rates. The enhanced electrochemical performance of the Cu 2 O nanotubes came from a high surface area, electrolyte access, high electrical conductivity of Cu core support, and structural integrity of the oxide shell active material.