کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1290657 | 1498038 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhanced cycle performance of SiO-C composite anode for lithium-ion batteries Enhanced cycle performance of SiO-C composite anode for lithium-ion batteries](/preview/png/1290657.png)
A silicon monoxide (SiO)-carbon composite prepared by ball-milling and pyrolysis is evaluated as an anode material for lithium-ion batteries. Electrochemical tests demonstrated that the first charge and discharge capacities of the material are about 1050 and 800 mAh g−1, respectively, with a first-cycle efficiency of 76%. The disproportionation reaction of pure SiO into Si and SiO2 during pyrolysis is confirmed by means of XRD and 29Si MAS NMR. The cycle performance of this material shows an excellent reversible capacity retention of 710 mAh g−1 over 100 cycles without any potential or capacity restrictions. This improved cycle performance is attributed to the stable microstructure, enhanced electrical contact afforded by the pyrolyzed carbon, and the amorphous phase transformation of the active material during cycling.
Journal: Journal of Power Sources - Volume 170, Issue 2, 10 July 2007, Pages 456–459