Synthesis, characterization and electrochemical properties of multi-layered porous Co3O4 nanoparticle assemblies

Multi-layered Co3O4 nanoparticle assemblies with well arranged Co3O4 nanoparticles have been fabricated through thermal conversion of micelle-assisted shaped precursor. Low angle diffraction data, TEM images and nitrogen-adsorption studies show that the obtained assemblies are porous. Wide angle XRD, HRTEM and Raman analysis results exhibit that the Co3O4 nanoparticle building blocks are well crystallized. Corresponding Raman spectrum of the assemblies shifts toward low wave number region compared with that for bulk crystalline Co3O4. Electrochemical measurement results demonstrate that the obtained Co3O4 nanoparticle assemblies can be served as a good cathode material for lithium secondary batteries. The initial discharge capacity of the electrode made from Co3O4 nanoparticle assemblies is 1 115 mAh . g(-1), which is much higher than that of the reported Co3O4 nanotubes, nanoparticles and nanorods electrodes. However, its cycling performance and stability are to be improved.