Hierarchical Ni–V2O5 hollow microspheres, prepared via a template-free Ni-mediated polyol process, have excellent Li storage properties as a Li-ion battery cathode (high capacity (294 mA h g−1), superior cycling stability/rate performance) due to their unique structure and low V valence state.
A simple procedure for the preparation of CoO and Co nanoparticles and using Na2SO4 as the template for the small nanoparticles encapsulated with thin carbon layers.