Electrochemical intercalation of hexafluorophosphate anion into various carbons for cathode of dual-carbon rechargeable battery

Electrochemical intercalation of PF6(-) into various carbons was studied for the cathode of an Li-ion rechargeable battery. It was found that the capacity of the electrochemical intercalation of PF6(-) increases with decreasing (002) plane distance, namely, increasing the crystallinity of graphitic-carbon, and the largest capacity was achieved on the carbon with almost ideal graphiticcarbon structure. By using graphitic carbon with high crystallinity and the stable electrolyte of ethylene carbonate-dimethylene carbonate, a rechargeable battery with high capacity (90 mAh/g) and rate property was successfully demonstrated. (c) 2007 The Electrochemical Society.