Sputtered copper coating on silicon/graphite composite anode for lithium ion batteries

[Display omitted] •A Si/graphite composite with sputtered Cu coating served as anode for LIBs.•The sputtering Cu coating improved the rate performance of the LIBs.•The sputtering Cu coating improved the cycle life of the LIBs. A sputtered copper coating on a silicon/graphite composite is investigate...

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Veröffentlicht in:Journal of alloys and compounds 2014-06, Vol.598, p.184-190
Hauptverfasser: Yen, Jui-Pin, Chang, Chia-Chin, Lin, Yu-Run, Shen, Sen-Thann, Hong, Jin-Long
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Sprache:eng
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Zusammenfassung:[Display omitted] •A Si/graphite composite with sputtered Cu coating served as anode for LIBs.•The sputtering Cu coating improved the rate performance of the LIBs.•The sputtering Cu coating improved the cycle life of the LIBs. A sputtered copper coating on a silicon/graphite composite is investigated as an anode material for lithium ion batteries (LIBs). Characterization of the material has been performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). Results show that the thickness of the copper on the nano-Si/graphite composite anode is controlled by the duration of copper sputtering. A sputtered copper coating of approximately 12nm thickness improves the rate capacity, maximum energy density and the elevated temperature cycling performance of LIBs with silicon/graphite anodes. The presented results confirm that the modification provided by sputtered Cu to the morphology of the solid/electrolyte interface of the anode surface is of interest to the next generation of high performance LIBs.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.01.230