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Characterization of SEI layer formed on Tin Film Anode
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DOI：10.4028/www.scientific.net/AMR.512-515.1869.png)
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Abstract
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Tin thin film on Cu foil substrate as the anode of lithium ion battery was prepared by direct current (DC) magnetron sputtering. The surface morphology and the solid electrolyte interphase (SEI) layer were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS). It is found that the SEI layer should be formed on the surface of the tin electrode after initial discharge processes, just like the carbon anode of lithium ion battery. The SEI layer undergoes continuous reformation during the initial cycles. The tin in the electrode can be covered completely by SEI layer after 3rd discharge process. The carbon in SEI layer is mainly in the form of -CO32-, which makes up about 54.5 at%.
Keywords:
Lithium-ion battery
Sn
SEI layer
Formation
XPS
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