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Nanoporous copper (NPC) ribbons with an average pore size of 5~500nm were fabricated by chemical/electrochemical dealloying of Mn55Cu45 alloy. The influence of different kinds of driving forces on Cu atoms surface diffusivity (Ds), which determines the pore sizes of the resultant NPC, was also systematically investigated. The Ds by chemical dealloying with and without surfactants is about 1.08×10-20 m2 s-1 and 1.79×10-18 m2 s-1, through which NPC with pore size of ~5nm and ~50nm was produced, while, in electrochemical dealloying with 0 V SCE potential, Ds and pore size increase to 1.16×10-15 m2 s-1 and ~500nm respectively. The three dimensional NPC ribbons with the largest pore size (500nm) was chosen as the current collectors to fabricate three dimensional tin thin-film anodes (3D-TTA) with homogeneous tin layers on the ligaments by electroless plating for lithium-ion batteries (LIBs). The 3D-TTA exhibits first discharge capacity of 790 mAh g-1, 45% capacity retention after 10 cycles, indicating a promising application in LIBs.
We give thanks to financial support by the State Key Basic Research Program of PRC (2007CB936502), the National Natural Science Foundation of China (50574008, 50954005, 51074011), the National 863 Program Project (2006AA03Z230, 2008AA03Z208). Also, we are grateful to Prof. T. Zhang and Dr. J.F. Wang for assistance in preparation of the starting alloy ribbons
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