Study On Micro-nano Structure Transition Metal Oxide In Anode Materials Of Lithium Ion And Sodium Ion Batteries

Nowaday,we are facing with energy and environment issues.Lithium-ion and sodium-ion batteries,as friendly secondary batteries,have the advantages of low self-discharge rate,long cycling life and so on.However,In this paper,we design and synthesize transition metal oxides with different micro-nano structures aim at the above problems.As a ande material for lithium ion and sodium ion batteries,the micro-nano structure transition metal oxide can make the contact between the electrolyte and the electrode active material more fully,and the reactive sites are more exposed,thereby improving the specific capacity of the battery negative electrode material.The specific research contents and conclusions are as follows:(1)Hollow nanoring ?-Fe2O3.Iron nitrate used as an iron source,dihydrogenamine phosphate and sodium sulfate were used as reactants,and a hollow nanoring ?-Fe2O3 powders with good crystallinity was obtained by one-step hydrothermal method and calcination treatment.It is used in lithium ion battery anode materials to exhibit a high specific capacity.At a current density of 200 mAg",after 50 charge-discharge cycles,its specific capacity can be maintained more than 900 mAhg-1.At current density of 500mAg-1,the capacity maintained more than 550 mAhg-1 after 50 cycles of charge-discharge cycles.The hollow nanoring ?-Fe2O3 material exhibits good electrochemical performance as a anode material for lithium ion batteries.(2)Multilayer ZnO/Co3O4 microspheres.Zinc nitrate and cobalt nitrate were used as zinc source and cobalt source respectively,ammonium fluoride was used as surfactant,urea was used as precipitant,multi-layer ZnO/Co3O4 microspheres were synthesized by hydrothermal method and calcination heat treatment,and multilayer ZnO/Co3O4 microspheres were used as the lithium ion battery anode material is cyclically charged and discharged at a current density of 100 mAg-1,with a high cycle charge-discharge specific capacity,and can be maintained,a specific capacity of 824.5 mAhg-1 after 100 charge-discharge cycles.(3)Copper-based nanorod arrays.Copper sheet 5was used as the substrate and copper source,sodium hydroxide was used as the reactant,ammonia water and hydrogen peroxide were used as the complexing agent,and the copper-based nanorod array was grown in situ on the copper substrate at room temperature,and then used by calcination heat treatment.On the negative electrode material of sodium ion battery,it shows a higher specific capacity.At a current density of 200 mAg-1,a specific capacity of 500 mAhg-1 was maintained after 50 charge-discharge cycles.