Fluorination of fullerene C60 and electrochemical properties of C60F

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Abstract Fluorinated fullerene polycrystalline powders C 60 F x have been obtained by direct fluorination of C 60 at 100°C. Electrochemical behaviors of C 60 and C 60 F x were investigated by the cyclic voltammetry and galvanostatic discharges on Li/1M LiClO 4 PC/C 60 and C 60 F 4 cells. The electronic structure changes of C 60 upon fluorination were also investigated by XANES and UPS. Three stepwise reversible reduction peaks (2.50, 2.15 and 1.85 V), and an irreversible reduction peak (2.8–3.2 V) corresponding to CF reduction were observed on the cyclic voltammograms. The fluorination of C 60 renders the open circuit voltage (OCV) higher by 1 V (OCV = 4 V vs. Li reference electrode), and the reversible reduction potentials nobler by 0.15 V. These electrode behaviors reflect the changes in the C 60 electronic structure through fluorination.

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