کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1286557 | 973194 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface structure and electrochemical characteristics of plasma-fluorinated petroleum cokes for lithium ion battery Surface structure and electrochemical characteristics of plasma-fluorinated petroleum cokes for lithium ion battery](/preview/png/1286557.png)
Plasma-fluorination of petroleum coke and those heat-treated at 1860, 2300 and 2800 °C (abbreviated to PC, PC1860, PC2300 and PC2800) was conducted for 15, 30 and 60 min using CF4 gas at 90 °C. Fluorine contents obtained by elemental analysis were negligible except PC fluorinated for 60 min (0.7 at.%). Fluorine concentration on the surface decreased with increasing heat-treatment temperature of petroleum coke, i.e. from PC to PC2800 when plasma-fluorination was made for 30 and 60 min. Transmission electron microscopic observation revealed that the closed edges of PC2800 were destroyed and opened by plasma-treatment. Plasma-fluorination increased surface disorder of heat-treated petroleum cokes, however, slightly reduced surface areas. These surface structure changes increased first coulombic efficiencies of PC2300 and PC2800 by 6–8 and 8–10% at both 60 and 150 mA g−1, respectively.
Journal: Journal of Power Sources - Volume 168, Issue 1, 25 May 2007, Pages 265–271