Spinel LiMn2O4 samples were prepared by melt-impregnation method. The effects of synthesis conditions on the electrochemical properties and crystal framework were investigated extensively. The results show that the reactive time in the second process affects the structure and electrochemical properties. The capacity decreases with prolonging reactive time. The optimum LiMn2O4 possesses an initial discharge capacity of 132.4mAh/g and good rechargeability. No remarkable loss of capacity was observed even after 50 cycles.