کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
191630 | 459725 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Rate capability of graphite materials as negative electrodes in lithium-ion capacitors Rate capability of graphite materials as negative electrodes in lithium-ion capacitors](/preview/png/191630.png)
The lithium-ion exchange rate capability of various commercial graphite materials are evaluated using galvanostatic charge/discharge cycling in a half-cell configuration over a wide range of C-rates (0.1–60 C). The results confirm that graphite is capable of de-intercalating stored charge at high rates, but has a poor intercalating rate capability. Decreasing the graphite coating thickness leads to a limited rate performance improvement of the electrode. Reducing the graphite particle size shows enhanced C-rate capability but with increased irreversible capacity loss (ICL). It is demonstrated that the rate of intercalation of lithium-ions into the graphite is significantly limited compared with the corresponding rate of de-intercalation at high C-rates. For the successful utilisation of commercially available conventional graphite as a negative electrode in a lithium-ion capacitor (LIC), its intercalation rate capability needs to be improved or oversized to accommodate high charge rates.
Journal: Electrochimica Acta - Volume 55, Issue 9, 30 March 2010, Pages 3330–3335