The Co-coated LiMn2O4 powders were synthesized by electroless plating. The phase, surface morphology and electrochemical properties of the synthesized powders were characterized with x-ray diffraction, scanning electron micrograph, electrochemical impedance spectroscopy and galvanostatic charge-discharge experiments. The Co-coated LiMn2O4 shows a coarse surface with a lot of holes. The specific capacity of Co-coated LiMn2O4 is 112 mA•h/g , which is slightly smaller than 123 mA•h/g for uncoated LiMn2O4. The capacity retention of Co-coated LiMn2O4 is 96.8% and 91.7% respectively after being cycled 20 times at room temperature and the temperature of 55℃, which are much higher than the values of 85.8% and 76.2% for the uncoated one.