Preparation Of TiO 2 /Co 3 O 4 Lithium Ion Battery Anode Material And Its Electrochemical Properties

Environmental problems and energy issues are two of the most important problems facing human development.Countries around the world are committed to the development of environmentally friendly new energy.Lithium-ion battery with a high energy density,high power density and environment-friendly and a series of advantages.Due to the low theoretical capacity of graphite and the poor performance of the traditional negative electrode materials,a series of their own limitations can not meet the needs of higher current capacity,faster charge and discharge speed and smaller volume lithium.Therefore,the development of a new lithium intercalation capacity,excellent performance of the new material to replace the graphite electrode has become an urgent problem to be solved.Among the many new kinds of negative materials,TiO₂ and Co₃O₄ become one of the hotspots.In this paper,the ultra-fine TiO₂-B nanowires were prepared by hydrothermal method with mechanical external force field.The stirring effect of the mechanical external force field during the hydrothermal reaction was improved by increasing the diffusion rate and surface chemistry Reaction rate and the rate of formation of nanotubes in solution were improved,so that nanotubes could grow in a short time.Secondly,using tetrabutyl titanate as precursors,TiO₂ nanoparticles were prepared by hydrothermal method.The TiO₂ nanorods and TiO₂ nanosheets were prepared by the reaction of TiO₂ nanoparticles with NaOH.The TiO₂ nanorods were prepared and the electrochemical properties were measured.It was found that the electrode had a high initial chargeback capacity at the first discharge of the ultra-fine ultra-long TiO₂-B nanowire electrode with a first discharge capacity of 295 mAh/g,a charge capacity of 285 mAh/g,and an irreversible capacity is 10 mAh/g and remains at 260 mAh/g after 40 cycles.The lithium performance of ultra-fine ultra-long TiO₂-B nanowires is better than that of TiO₂ nanosheets.At the same time,Co₃O₄ nanosheets and Co₃O₄ pine needles were prepared by hydrothermal method,and the phase and electrochemical properties of these two kinds of materials were tested.It was found that the first discharge capacity of lamellar Co₃O₄ nanostructures was 1109 mAh/g,the charge capacity was 812 mAh/g,the irreversible capacity was 297 mAh/g,and the Coulomb efficiency was 73%.This discharge capacity is much larger than the theoretical capacity of CO3O4,and after 40 times,the capacity can still be maintained at about 760 mAh/g.The lithium performance of lamellar Co₃O₄ nanostructures is better than that of Co₃O₄ pine needles.Finally,the composite materials of TiO₂-B nanowires and lamellar Co₃O₄nanostructures were prepared by hydrothermal method,and the phase and electrochemical properties were tested.It was found that the first discharge capacity of TiO₂/Co₃O₄ nanometer nest structure was 777 mAh/g,the charge capacity was 759 mAh/g,the irreversible capacity was 18 mAh/g,and the discharge capacity could reach 700 mAh/g after 40 cycles Above,in addition to the first discharge when there is a large capacity loss,in the subsequent cycle of the process,the discharge capacity remained stable,TiO₂/Co₃O₄ nano-nest-like structure of the cycle performance is very excellent.