Abstract: Three-dimensional structure foam Co3O4 anode was prepared by electrodepositing metal cobalt on foam nickel substrate following with solid phase oxidation treatment, and SEM results show that nanostructure cobalt film was obtained by electrodeposition, and Co3O4 film was prepared by solid phase oxidation using cobalt foam as metal source. Co3O4 film was micrometer-size dense thin film. Electrochemical performance of as-prepared foam Co3O4 was evaluated by galvanostatic cycling, cyclic voltammetery and electrochemical impedance spectra. The results show that the initial capacity is 29% and a high capacity of 824 mA·h/g(at 0.2 C rate) is obtained with high capacity retention of up to 50 cycles in the range 0.05—3.2 V. Capacity retention and high-rate discharge performance of Co3O4 electrodes are improved by the application of three-dimensional foam structure electrodes.

Key words: Electrodeposition, Solid phase oxidation, Three-dimensional structure, Foam Co3O4, Lithium-ion battery