The design and synthesis of polyhedral Ti-doped Co₃O₄with enhanced lithium-storage properties for Li-ion batteries

Polyhedral Ti-doped Co3O4nanoparticles with a diameter of about 100–300 nm have been easily synthesized by a co-heat precipitated method. The structure and morphology of the materials were characterized by X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The electrochemical measurements were implemented on half coin cells. Galvanostatic charge, discharge performance, cyclic voltammetry and impedance measurement were utilized to investigate the electrochemical properties. The Ti-doped Co3O4electrodes showed superior performance compared with the undoped Co3O4electrodes, including the enhanced rate capability, and better capacity retention. At current densities of 500 mA g−1, the Ti-doped Co3O4electrodes exhibited initial capacities of 1173.6 and 849.0 mAh g−1, and the capacities were maintained at 850.3 and 838.6 mAh g−1after 120 cycles. These excellent electrochemical properties can be attributed to the nanoscale structure and Ti doping.