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Sn-based lithium-ion batteries have low cost and high theoretical specific capacity. However, one of major
problem is the capacity fading caused by volume expansion during lithiation/delithiation. In this study, 3-
dimensional foam structure of Cu-Sn alloy is prepared by co-electrodeposition including large free space
to accommodate the volume expansion of Sn. The Cu-Sn foam structure exhibits highly porous and numerous
small grains. The result of EDX mapping and XPS spectrum analysis confirm that Cu-Sn foam consists of
SnO2 with a small quantity of CuO. The Cu-Sn foam structure electrode shows high reversible redox peaks
in cyclic voltammograms. The galvanostatic cell cycling performances show that Cu-Sn foam electrode has
high specific capacity of 687 mAh/g at a current rate of 50 mA/g. Through SEM observation after the charge/
discharge processes, the morphology of Cu-Sn foam structure is mostly maintained despite large volume expansion during the repeated lithiation/delithiation reactions.
Keywords : Electrodeposition, Cu-Sn alloy, 3D-foam, Lithium ion battery, Anode
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