Synthesis of fluorine-graphite intercalation compounds by elemental fluorine and high oxidation-state transition-metal fluorides

✍ Scribed by T. Nakajima; Y. Matsuo; B. žemva; A. Jesih

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 367 KB
• Volume: 34
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(96)00110-8

✦ Synopsis

Fluorine-graphite intercalation compounds have been synthesized using high purity fluorine gas and high oxidation-state transition-metal fluorides, AgF, and NiF,, at room temperature and at -78°C. At room temperature, a mixture of stage 1+2-4 compounds with compositions, r&F to C,,,BF were obtained. On the other hand, stage 2-4 compounds with compositions C&F to C,,,,F were synthesized at -78°C. The fluorinating ability of AgF, and NiF, has been shown more clearly at room temperature because a small amount of fluorine was intercalated/absorbed into graphite at -78°C without catalysts. XPS spectra show that ionic, nearly ionic, semi-covalent and covalent fluorines coexist in the C,F samples, and that the covalency of C-F bonding increases with decreasing stage number.