The Research On The Synthesis Of ZnSe-based Carbon Nanofibers Via Electrospinning And Their Applicaition For Energy Storage

Since the end of the 19th century,people began to use energy vehicles,especially in recent years,the limitation of fossil energy and clean energy demand is rising,the demand for electric equipment to force an unprecedented state,therefore,the phenomenon of the lithium resources in short supply,seeking lithium ion alternative energy is imminent.Sodium is one of the powerful alternative resources for lithium ion because of its rich resources,low price and the same embedding mechanism as lithium ion.Bimetallic selenide is a potential electrode material because of its simple preparation and strong plasticity.In the research of sodium ion energy storage by using bimetallic selenide,a more optimized effect can be achieved by adjusting the appropriate metal ratio.The results of this thesis are as follows:(1)ZnSe with a band gap of 2.7 e V in the application of sodium ion batteries,Good results have been achieved.Cu₂Se-ZnSe-CNFs were prepared by electrospinning and subsequent selenization calcination.Cu₂Se is a very important P semiconductor,the lattice formed between Se and Cu ions is relatively stable.But its effect on battery research is not ideal.We have applied Cu ₂Se-ZnSe-CNFs in sodium ion batteries with different element ratios of Zn and Cu to explore the Cu₂Se-ZnSe-CNFs in sodium ion storage with type?heterojunction structure.As a sodium anode,at a current density of0.1 A g^-1,a discharge capacity was 310 m Ah g^-1 after 100 cycles.The rate performance achieved 237 m Ah g^-1 discharge capacity at 2 A g^-1.(2)In order to further study the sodium electric energy storage characteristics of ZnSe,the chemical performance of Ni Se₂ carbon nano fiber as sodium electric negative electrode material is not very good.The further modification of Ni Se ₂carbon nanofibers by ZnSe,the formation of Ni Se ₂-ZnSe-CNFs composites and their application to sodium electricity confirm that bimetallic selenides have unique advantages in energy storage,it can make up for the defects of single metal selenides.On the sodium electric energy storage,combined with the performance diagram,we can see that the combination of the complex will greatly improve the discharge capacity of a single metal selenide.In terms of rate,the material ends at 2000 m A g^-1 current gradient,and again recovers to 100 m A g^-1,the capacity can reach 390 m Ah g^-1.