A Research On The Negative Material And Cycle Stability Of Nickel-zinc Battery

Nickel-zinc secondary battery is an environment-friendly green high performancesecondary battery, has the characteristics of a high operating voltage, energy density, nomemory effect,high safety index, low production costs. But there are distortions,dendrite growth of zinc electrode and passivation of nickel positive electrode andpoisoned makes its life cycle issues such as poor,seriously restricting the application anddevelopment of Ni-Zn batteries.This paper of research is based on systematic reviews of Ni-Zn battery and zincelectrode materials research at home and abroad, starting from the reduced solubilityZnO in alkaline solution and increase the conductivity as angle, by direct mechanicalstirring add zinc electrode additive (metal oxide, hydroxide), synthesis of a new batterymaterial and method, ZnO surface carbon coated on the performance of the Ni-Znbattery was modified.Several metal oxide additives have varying degrees of influence on the corrosionresistance of zinc electrode,zinc anode as an additive to improve the initial dischargecapacity of the battery. It is different corrosion resistance of zinc anode with differentCa(OH)2added. when the addition of Ca(OH)2amount is25%,zinc negative optimumcorrosion resistance can be improved.Calcium zincate as the zinc electrode active material has excellent loop stability,comes down calcium zincate lower solubility in alkaline solution to reduce thedeformation of the zinc electrode,thereby improving the stability of the zinc electrodecirculation.The coprecipitation method and hydrothermal combination is used to preparedifferent Zn/Al hydrotalcite.As the zinc negative material,it can effectively alleviate the corrosion in alkaline electrolyte.When Zn/Al molar ratio is2:1and3:1showmore obvious discharge plateau(1.75V)compared to pure ZnO negative dischargeplatform(1.65V)it is higher.The mechanism ZnO coated with carbon,mainly glucose and ordinary ZnOas raw materials,it is used to preparate ZnO/C composite.The electrochemicalproperties of ZnO/C were characterized on secondary battery testing equipmentand electrochemical workstation.The results have shown the sample adding differe-nt amounts of glucose precursors in an inert gas at650℃for6h,the carbon isamorphous form. Electrochemical curve shows:ZnO/C as zinc negative electrode material,the discharge capacity remained549mAh/g after80cycles,the capacityretention rate is87%of the highest capacity(610mAh/g).The discharge capacityis still412mAh/g after200cycles, the capacity retention rate is of68%the highest value(610mAh/g).Electrochemical curves show the preparation of ZnO/Csample at higher temperature(650℃) has a cycle stability,exhibits a good capacityretention.The discharge capacity still maintain549mAh/g, higher68mAh/g than450℃after80cycles.