کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1285906 | 973164 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Spherical silicon/graphite/carbon composites as anode material for lithium-ion batteries Spherical silicon/graphite/carbon composites as anode material for lithium-ion batteries](/preview/png/1285906.png)
A spherical nanostructured Si/graphite/carbon composite is synthesized by pelletizing a mixture of nano-Si/graphite/petroleum pitch powders, followed by heat treatment at 1000 °C under an argon atmosphere. The structure of the composite sphere is examined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). The resultant composite sphere consists of nanosized silicon and flaked graphite embedded in a carbon matrix pyrolyzed from petroleum pitch, in which the flaked graphite sheets are concentrically distributed in a parallel orientation. The composite material exhibits good electrochemical properties, a high reversible specific capacity of ∼700 mAh g−1, a high coulombic efficiency of 86% on the first cycle, and a stable capacity retention. The enhanced electrochemical performance is attributed to the structural stability of the composite sphere during the charging–discharging process.
Journal: Journal of Power Sources - Volume 176, Issue 1, 21 January 2008, Pages 353–358