Co₃O₄ negative electrode for lithium-ion batteries prepared by electrochemical deposition-sintering processes and its capacitance performance

The Co₃O₄ negative-electrode for lithium-ion batteries was prepared by electrochemical deposition and sintering processes. XRD analysis illustrates that the essential phase of the electrochemical deposited product is Co(OH)₂, which transforms to Co₃O₄ after sintering at 300°C. From SEM observation, it is found that Co₃O₄ is the image of a leaves morphology with sizes of 20 - 30 nm in thickness. Co₃O₄/Li batteries were made by Co₃O₄, which was sintered at 300°C for 30, 45 and 60 min, respectively. During the first charge-discharge cycle, it is found that the specific capacities of Li ions insertion are 1361.7, 1457.6 and 1345.0 mAh/g and the specific capacities of Li ions extraction are 757.7 mAh/g, 905.0 mAh/g and 794.8 mAh/g, respectively. The specific capacities of discharge increase to 815.5 mAh/g, 969.0 mAh/g and 890.1 mAh/g after 10 cycles, respectively.