Abstract
Porous Si-Al films were fabricated by magnetron sputtering (co-sputtering) using three different copper substrates as current collectors, respectively. The morphology, compositions, structure, and crystallinity of the porous Si-Al films anodes were examined by using SEM, EDX, TEM, XRD, and Raman spectroscopy. The electrochemical properties of the porous Si-Al films anodes were evaluated by galvanostatic cycling. The Si-Al film deposited on copper foam showed higher insertion/extraction capacity, capacity retention, and longer cycle life in comparison to the Si-Al films deposited on expanded copper mesh and even copper mesh grid, which could be attributed to its unique three-dimensional macroporous structure. The three-dimensional macroporous structure could offer larger materials/electrolyte contact area, a much better adhesion, lower electrical resistance (i.e., well conductive), and stress-alleviated environment to partly accommodate volume expansion that leads to exfoliation during cycling.
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This work was financially supported a grant from the National High Technology Research and Development Program of China (863 Program) (No. 2013AA110101).
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Liu, P., Zheng, J., Qiao, Y. et al. Fabrication and characterization of porous Si-Al films anode with different macroporous substrates for lithium-ion batteries. J Solid State Electrochem 18, 1799–1806 (2014). https://doi.org/10.1007/s10008-014-2418-y
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DOI: https://doi.org/10.1007/s10008-014-2418-y