| 초록 |
A novel method of introducing highly electronegative fluorine elements on carbon surfaces was conducted on the commercialized natural and synthetic graphites for enhanced performance of lithium ion battery anodes. The surfaces of graphites were modified with carbon-fluorine (C-F) groups via C4F8 vacuum plasma treatment. The characteristics of C-F bonding (ionic, covalent and semi-ionic) on the graphite surface was determined by XRD, Raman, EA and XPS. The introduced semi-ionic C-F groups reduced the resistance related to lithium ion migration and charge transfer, leading to vast increase of discharge capacity without deteriorating the 1st cycle coulombic efficiency at high 10C rate. |
