Abstract
Surface fluorination of graphitized vapor grown carbon fiber (VGCF) has been performed with F2, F2-O2, NF3 or ClF3 under mild conditions. Charge/discharge characteristics were investigated in 1 mol/l LiClO4-ethylene carbonate (EC)/diethyl carbonate (DEC) and EC/DEC/ propylene carbonate (PC) solutions. The main effect of surface fluorination was increase in charge capacities. The increase in charge capacities was larger for VGCF fluorinated with ClF3 or NF3 than F2 or F2-O2. The reason is that the fluorination reactions of graphite with ClF3 and NF3 are radical reactions having surface etching effect, effectively breaking cylindrically rolled graphene layers of VGCF.
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