The spinel Co₃O₄ has great application potential in heterogeneous catalysts, anode materials in Li ion rechargeable batteries, solid-state sensors, electrochromic devices, solar energy absorbers, pigments, and so on. Because of the influence of particle size and morphology on the properties of materials, the controlled preparation of Co₃O₄ particles of different sizes and morphologies is always the researcher's purpose. Up to now, Co₃O₄ particles of different sizes and morphologies including tubes, rods, fibers, films, and cubic single crystals in nanoscale have been prepared; the synthesis of its hollow nanospheres with oriented-aggregation structures has been introduced. The electrochemical properties of the as-prepared Co₃O₄ hollow spheres as anodes in Li ion cells are tested via cyclic voltammetry (CV) measurements, presenting good cycling stability.

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