We used cyclic voltammetry (CV) and galvanostatic cycling test to optimize the synthesis condition and electrode composition for spinel LiMn2O4 cathode. Based on a synthetic approach of solid reaction, the most appropriate Li-Mn source for the synthesis of LiMn2O4 was found to be LiOH/NbO2 and the optimum synthesis condition was to react at 750 degreesC in air for 18 h. The LiMn2O4 such obtained has an initial specific capacity of 120-130 mAh/g between 3.5 and 4.2 V. In the electrode films, the carbon that was used as a conducting agent significantly affects performance of the LiMn2O4 electrode. Among the carbons examined in this work, we found that carbon black from Alfa Aesar was a better conducting agent and its appropriate content was around 10% in the LiMn2O4 electrode.