Surface modification of LiMn2O4 by coating with nano-thickness carbon and fluorine were carried out by an arc discharge with carbon electrode (nC-LiMn2O4 , n=number of times of arc discharge for 0.1 s) and a fluorination with NF3 at 1.3 kPa for 1 hour at 100degreesC (F-LiMn2O4). Cyclic voltammograms revealed that the reversibility of the electrochemical process was improved by coating with nano-thickness carbon. The discharge capacities of nC-LiMn2O4 and F-LiMn2O4 were improved by 5similar to10%. 120C-LiMn2O4 exhibits the largest discharge capacity.