Research On The Preparation Of Cathode And Anode For Zinc-air Secondary Battery

The zinc air secondary battery is very suitable for the power source of city electric vehicle because of its high specific capacity,non-flammable,low cost,environmental benigh and so on.This paper studies the preparation of the cathode and anode of zinc-air secondary battery,which is mainly due to the effect of hydrogen evolution corrosion on the two cycle performance of zinc air battery,the overcharging voltage and the high energy consumption of the battery.The method of metallurgical electrochemistry was employed by electrodeposition of?-PbO₂ on copper cathode and the modification of tin and bismuth metal on the zinc anode to study the effect of the performance of zinc air battery.The detailed research aspects are carried out as follows:In the lead dioxide electrode preparation experiment,the effect of current density on the morphology of the electrodeposited?-PbO₂ layer and the electrochemical performance of the electrode were studied.The experimental results show that,when the current density is 20 mA/cm²,the grain of the lead dioxide electrode coating is the smallest,the surface is the smoothness,and the oxygen evolution potential of the cathode is reduced by 0.15 V after the cathode surface is modified with lead oxide.It shows that lead dioxide electrode can reduce the oxygen evolution potential of the cathode,reduce the charging voltage and energy consumption,and the current density is 20 mA/cm².Study on the preparation and properties of bismuth plated zinc anode,the influence of bismuth concentration on bismuth metal electrodeposition and the effect of Zinc Oxide concentration on the hydrogen evolution performance of bismuth electrode were studied in the bismuth electrode experiment.Polarization curves?LSV?,AC impedance?EIS?and scanning electron microscopy?XRD?were used to characterize the experiment.The experimental results show that when the concentration of bismuth nitrate is 50 g/L,the morphology of the coating is the best.When adding 20 g/L of ZnO into the electrolyte,the hydrogen evolution potential on the bismuth anode is higher.Study on the preparation and properties of tin plated zinc anode,the effect of gelatin additive on tin electrodeposition was studied and the electrochemical performance of tin electrode was studied.The experimental results show that the electrodeposition of tin is based on the electrocrystallization mechanism of the three-dimensional transient nucleation growth,the gelatin can improve the tin deposition potential,the improvement of the morphology and structure of the tin coating,the metal tin can improve the hydrogen evolution potential and reduce the hydrogen evolution corrosion.Compared with zinc anode,tin zinc and bismuth zinc,it can be seen that tin electrode can improve hydrogen evolution reaction,but bismuth electrode decreases hydrogen evolution reaction.Three electrodes of zinc,tin and bismuth are used as anode.The nickel electrode and the?-PbO₂ electrode are oxygen precipitated cathodes.The three air electrode,which consists of two times zinc air battery,tests its charging and discharging performance.The experimental results show that the lead dioxide cathode can reduce the charge voltage of the battery.The tin anode can improve the charge discharge performance of the battery,while the bismuth anode degrade the performance of the tin anode.It can be concluded that the charge and discharge performance of zinc-air secondary battery is best when the lead dioxide cathode and tin anode are selected.