Structure Design And Lithium Storage Properties Of Binary Transition Metal Oxides

With the vigorous development of the new energy automotive industry,lithium-ion batteries usher in new opportunities for development.The increasing market demand has promoted the research and development of higher performance and lower cost lithium-ion batteries.The electrode material responsible for providing capacity is the key to improving the performance of lithium-ion batteries.The transition metal oxides with high lithium storage capacity have become a hot topic of research and are potential anode materials for lithium ion batteries.The metal oxide material has a low conductivity,and has a volume effect as a negative electrode material in the charging and discharging process,which affects the cycle performance of the battery..In this paper,a reasonable structural design of binary transition metal oxides to optimize its electrochemical performance.Using the common electron microscopy and X-ray diffraction and other characterization methods and electrochemical testing techniques,the phase and structure of the material were analyzed in depth to explore the relationship between the lithium storage properties and the morphology of the material.By controlling the crystal surface growth of nanomaterials,octahedral nickel ferrite crystals with(111)crystal faces were synthesized.The graphene-ferrite nickel composites were prepared by self-assembly of graphene oxide after surface modification.The octahedral crystal material has a stable structure,and the graphene composite further enhances the electrical conductivity and specific surface area of the material.In electrochemical tests,the composite exhibits excellent properties.At a current density of 0.1 A g-1,after 100 cycles,the discharge specific capacity reached 1225 mAh g-1.At a current density of 1A g-1,250 cycles were performed with a capacity of 937 mAh g-1,and the crystal structure of the material remained good after multiple charge and discharge.Using Prussian blue as the precursor,binary metal oxide materials with hollow cubic structure were prepared by adjusting annealing conditions.The hollow structure of the nano-material provides an effective buffer for the volume effect that occurs during charge and discharge process of the battery,and improves the lithium storage performance of the material.Cycling at 0.2 A g-1 for 100 cycles,the battery capacity was 978.1 mAh g-1.When the current density was 0.1 A g-1,after 70 cycles,the reversible capacity was 1366.3 mAh g-1.