Electrochemical Behavior of LiMn₂O₄ with Fluorine-Carbon Nanocomposite Surface

抄録

LiMn₂O₄ with fluorine-carbon nanocomposite surface was prepared by carbon coating with an arc discharge (nCLiMn₂O₄, n=number of times of arc discharge for 0.1s) and by fluorination using NF₃. Potentiostatic charge behavior of surface modified LiMn₂O₄ at 4.3V revealed that the nano-thickness carbon coating made after surface fluorination prevented the electrolyte solution from the oxidative degradation on the LiMn₂O₄ during charge process. From charge/discharge cycle test (50 cycles) at a constant current corresponding to the rate of 0.3C, 30CLiMn₂O₄ obtained after surface fluorination with NF₃ exhibits the smallest decrease in discharge capacity through 50 cycles and the largest discharge capacity at 50^th cycle among the samples examined in this study.