Abstract
Fluorine intercalated carbon fibres, (CF) n , have been prepared from benzene-derived, vapour-grown carbon fibres, and have a high degree of preferred orientation of the carbon layers along the fibre axis. The (CF) n fibres have been obtained through direct reaction with elemental fluorine at temperatures as low as 300 °C, using carbon fibres of diameter 0.1 - 1.0 μm. The fibres have been used as the cathode material in a lithium battery with 1 M LiClO 4-propylene carbonate solution. The discharge potential of (CF) n fibres is about 0.5 V higher than that of conventional graphite fluoride (CF) n at a load of 0.5 mA cm −2 and with a cathode utilization of 8̃0%. It is suggested that this high performance is due to the chemical and physical characteristics of the fibrous compounds.
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