Three-dimensional core–shell Cu@Cu6Sn5 nanowires as the anode material for lithium ion batteries

Core–shell Cu@Cu6Sn5 nanowires with three-dimensional structure have been successfully synthesized via an electrodeposition process, using Cu(OH)2 nanorods prepared by anodization as the substrate. Different temperatures have been employed to heat-treat Sn–Cu composites. After heat-treated at 80 °C, strong adherence of the active material Cu6Sn5 to the current collector is achieved, and the crystal structure becomes more stable, thus delivering best cycling performance of 0.162 mAh cm−2 after 200 cycles at 1 C. Furthermore, superior rate capability (as high as 20 C) is also obtained.

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► We obtain Cu(OH)2 nanorods substrate by anodization.
► We obtain three-dimensional core–shell Cu@Cu6Sn5 nanowires after electrodeposition.
► We obtain great cycling performance and rate capability.
► The morphology and structure can be maintained after cycles.