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Electrochemical intercalation of PF6 -, counter anion of supporting acid in electrolyte, into graphitic carbon was investigated in this study for a new concept of positive electrode for Li ion rechargeable battery. It was found that potential for PF6 -electrochemical intercalation occurs at 4.5 -5.0V Vs. Li/Li*. Therefore, graphitic carbon can be used for cathode of Li ion rechargeable battery. Capacity for PF 6 " intercalation increased with increasing the content of graphitic carbon and capacity of ca. 60 and 40 mAh/g were obtained for intercalation and de-intercalation on the carbon with graphitic carbon content of 98%. The intercalation capacity further increased by oxidation treatment and the largest capacity was achieved by oxidation at 773K for 3h. Ex-situ XRD measurement suggests that distance between (002) plane was expanded by intercalation and reduced by de-intercalation. XRF measurement suggests that intercalated species are PF«", which is counter anion of Li* in electrolyte. Therefore, electrochemical intercalation of PF 6 " into graphitic carbon can be used for cathodic reaction of Li ion rechargeable battery.