PhenolFormaldehyde Resin Coated Graphited Needle Coke as Cathode for Lithium Ion Batteries

In order to improve the first Coulomb efficiency and reversible capacity of graphited needle coke as cathode for lithium ion batteries, the surface of needle coke was coated by phenolformaldehyde resin. According to the analysis of XRD, SEM and relative electrochemical performances, the first reversible capacity and Coulomb efficiency of coke as cathode were increased from 269 mA·h/g and 55.0% without coating to 327 mA·h/g and 69.9% coating with 10% resin, and the charge capacity remained at 299 mA·h/g and the cycle efficiency was close 100% even after 20 cycles of charge/discharge. It means that the coating method can improve the electrochemical performance of graphited needle coke as cathode for lithium ion batteries.