Effect of iodine treatment on the electrochemical performance of natural graphite as an anode material for lithium-ion batteries

After being heated with iodine at certain temperatures in nitrogen, natural graphite shows superior electrochemical performance compared to the original one as the anode material in lithium-ion batteries. The electrochemical behavior of iodine-treated natural graphite was studied and the improvement for the electrochemical performance of natural graphite after iodine treatment was mainly ascribed to the chemically bonded iodine on the surface of natural graphite.