Colloidal carbon spheres were prepared using glucose as precursor by hydrothermal synthetic route, and then Co₃O₄/CoO/Co/graphite composites are synthesized with colloidal carbon spheres. The composites possess different structures in comparison to materials prepared by other researchers with similar method. They consist of multilayer materials with spherical structures. The first, second, third and inner layer are Co₃O₄, CoO, Co and graphite, respectively. Electrochemical property of Co₃O₄/CoO/Co/graphite was studied by cyclic voltammetry and constant current charge-discharge. The results showed that capacitive performance of the composites results from pseudo-capacitance caused by redox reactions and electric double-layer capacitance. The specific capacitance of the material is 25.2 F•g^－1, which is lower than that of Co₃O₄. However, the potential windows is －1.0～0.46 V, which is higher than that of Co₃O₄.

Key words: colloidal carbon sphere, hydrothermal method, composite, capacitance performance