Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 476, Issue 1-2, Pages 70-73Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.09.030
Keywords
Porous Cu substrate; Sn-Co alloy; Anode; Lithium ion battery
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Funding
- National 973 program [2009CB220102]
- National Natural Science Foundation of China [20773102]
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Porous Cu was prepared by electrodepositing Cu on a Cu foil using hydrogen bubbles as dynamic template, followed annealing at appropriate conditions to strengthen the adhesion between the porous Cu layer and the Cu foil substrate. Sn-Co alloy was then electrodeposited on the porous Cu substrate which served as current collector to be used as anode of lithium ion battery. X-ray diffraction (XRD) and EDS analysis indicated that the Sn-Co alloy was an intermetallic compound of CoSn3, whose surface structure is stable as illustrated by scanning electronic microscopy (SEM) images obtained before and after electrochemical cycles. It has also revealed that the Sn-Co alloy anode on the porous Cu substrate possessed a relative large capacity and a superior cycleability than that of the Sn-Co alloy anode on the smooth Cu sheet. The first discharge and charge capacities were measured respectively at 726 and 563 mAh g(-1), and its capacity in the 50th cycle was retained at ca. 71% of that in the second cycle, which has been improved more than 3 times higher of that of the Sn-Co alloy anode on the smooth Cu sheet under the same conditions. (C) 2008 Elsevier BY. All rights reserved.
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