Synthesis of Co-coated lithium manganese oxide and its characterization as cathode for lithium ion battery

Co-coated LiMn2O4 was synthesized by electroless plating. The phase identification, surface morphology, and electrochemical properties of the synthesized powders were studied by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, and galvanostatic charge-discharge experiments, respectively. The result shows that Co-coated LiMn2O4 particle has a coarse surface with a lot of holes. The specific capacity of Co-coated LiMn2O4 is 118 mAh g(-1), which is a bit less than 123 mAh g(-1) for the uncoated LiMn2O4. The capacity retention of Co-coated LiMn2O4 is 11% higher than the uncoated LiMn2O4 when the electrode is cycled at room temperature for 20 times. When cycled at the temperature of 55 A degrees C, the capacity retention of Co-coated LiMn2O4 becomes 15% higher than the uncoated one.