Design And Synthesis Of Anode Matterials Of Zinc Nickel Secondary Battery And The Performance Analysis

Zinc-nickel secondary battery has the advantages of low cost,good safety,high specific energy,high specific power,no pollution and so on.It has a broad application prospect in energy storage and other fields.In the process of charge and discharge,the negative electrode of zinc nickel secondary battery will have deformation,dendrite,passivation,self-corrosion and other problems,which will reduce the cycle performance of zinc nickel secondary battery and limit the wide commercial application of zinc nickel secondary battery.In view of the above problems,this paper designed and synthesized reduced graphene oxide composite zinc oxide material,bismuth oxide modified indium doped zinc oxide material and reduced graphene oxide composite indium doped zinc oxide material,and explored and studied the structure and discharge performance of the material.The specific research contents are as follows:We used the reduced graphene oxide with good conductivity as the carrier to prepare the reduced graphene oxide composite zinc oxide material.We studied the morphology and structure of the material.Through the electrochemical performance test of the material,we explored the electrochemical performance of the reduced graphene oxide composite zinc oxide material.The results showed that the reduced graphene oxide composite zinc oxide material was used as the zinc nickel anode for the second time Compared with single zinc oxide,the battery has higher discharge capacity and better cycle stability.After 50 charge discharge cycles,the discharge specific capacity is still 554 mAh g^-1,which is much higher than that of single zinc oxide.In this work,bismuth trioxide composite indium doped zinc oxide was synthesized by hydrothermal method,and the reason for the improvement of the discharge performance of the composite material as the negative material of zinc nickel secondary battery was studied by phase analysis and electrochemical test.The indium doped zinc oxide with bismuth trioxide composite was spherical and porous,with high specific surface area and good crystallinity,which effectively inhibited the deformation and dendrite of zinc electrode.As a result,the Zn Ni secondary battery,which was assembled as negative electrode material,has excellent cycle stability and high discharge energy.After 50 charge discharge cycles,the specific discharge capacity of bismuth trioxide composite indium doped ZnO is 559.3mAh g^-1,which is three times higher than that of pure ZnO.In this work,indium doped ZnO composite material with reduced graphene oxide was designed and synthesized,which was used as anode material of Zn Ni secondary battery.The results show that the composite indium doped ZnO material has long cycle life and excellent rate performance.The maximum discharge specific capacity is 643.4mAh g^-1,and the coulomb efficiency is 97.63%.After 125 cycles,the specific capacity is still 531.3mAh g^-1.At the current density of 0.5C,1C,2C,3C,5C,the highest discharge of composite indium doped ZnO sample is achieved When the current density returned to 0.5c,the specific capacity still recovered to 637.1 mAh g^-1,indicating that the material has excellent structural stability.