Study On Stabilizing Of Metal Zinc Anode And Electrochemical Performances

With the development of electric vehicles,wearable electronic devices and large-scale power grid energy storage devices,lithium ion batteries（LIBs）can no longer satisfy the increasing energy needs.Rechargeable aqueous zinc ion batteries（RAZBs）have recently become a promising energy storage technology due to their advantages of high safety,low cost,high ionic conductivity and rich zinc resources.However,the practical application of Zn metal anodes is severely limited by interfacial side reactions（such as hydrogen evolution,corrosion,passivation and Zn dendrites growth）between the Zn anode and aqueous electrolyte during the long-term cycling.Therefore,in order to obtain high performance zinc metal anode battery,we needs to spare no effort to take measures to stabilize Zn anodes.The stabilization modifications of zinc metal anodes enjoy a long time history of researches.The common research strategies mainly include optimization of electrolytes,preparation of gel electrolyte,structural design of composite Zn anodes,and the construction of artificial interface engineering.Among them,design of artificial interface structure is constructing an artificial solid electrolyte interface（SEI）film on the surface of zinc metal anode via certain methods.And the coating layer is beneficial in protecting the zinc anode from these above side reactions,and that suppressing zinc dendrites generation during the cycling processes via physical isolation,energy regulation or ion redistribution,so as to realize a longer lifetime zinc-ion battery.Herein,we synthesized an updated In@Zn metal anode successfully via fabricating an artificial SEI layer on zinc anode surface through a facile ion-exchanging strategy.The composition and thickness of artificial SEI layer were adjusted by the reaction parameters（modification methods and concentrations of solutions）during the modification processes.Later,electrochemical cycling performances of symmetrical batteries and Zn-Mn O₂ full cells with updated In@Zn metal and bare Zn anodes were tested in aqueous batteries,respectively.Results show that the stabilized In@Zn metal anode can work well within a test period of 1400 h at the current density of 0.25 m A cm^-2,and the stabilization process greatly extends the cycle life of zinc metal battery.Moreover,the cycle life of Zn-Mn O₂ full battery has been improved about 2 time.All the results prove that the stabilization of zinc metal anodes is positive and effective in inhibiting the Zn dendrites growth and interfacial parasitic reactions.