Study On Preparation Modification And Performance Of Composite Current Collector For Aqueous Battery

In recent years,the development of lithium-ion batteries has progressed by leaps and bounds,but due to their organic electrolytes,they often cause safety issues such as explosions and fires.Therefore,the research and application of water-based batteries have attracted people’s attention.The advantages of high safety,non-toxicity,and low cost make the use of aqueous batteries very promising in large-scale power grids.However,as one of the important components of the battery,the corrosion and dendrites of the metal current collector in the aqueous solution have become a major problem restricting the development of water-based batteries.This subject has conducted in-depth research on the common current collectors of two aqueous batteries（sodium ion batteries and zinc ion batteries）as the research object.In this paper,the corrosion behavior of common stainless steel current collectors in aqueous batteries is studied,and the corrosion behavior of different types of stainless steel in conventional aqueous electrolyte is explored.It is found that 304L type stainless steel has the strongest corrosion resistance and is most suitable for aqueous battery’s metal current collector.Then,304L stainless steel was used as the positive electrode current collector in an aqueous zinc-ion battery,and the zinc foil was used as the negative electrode of the zinc-ion battery.Since the corrosion of anode zinc and the formation of dendrites will seriously reduce the performance of the battery,this paper studies the modification of zinc foil to improve the performance of zinc-ion batteries.The Si O₂-Zn anode was prepared by the casting method,and the silica coating could promote the uniform dissolution and deposition of zinc ions to inhibit the formation of zinc dendrites.Subsequently,a Mn O₂//Si O₂-Zn full battery was assembled with manganese dioxide as the positive active material.The specific discharge capacity of the battery was 84.3m Ah/g,and the capacity retention rate after 500 cycles was 75.2%.The performance of the battery is higher than that of the Mn O₂//Zn full battery with pure Zn as the negative electrode.Due to the relatively low electrical conductivity of stainless steel,a conductive organic composite PEAB film was prepared in this paper in order to use aluminum foil with higher electrical conductivity but poor corrosion resistance as the current collector of water-based batteries.And then it was compounded with aluminum foil to prepare Al-PEAB membrane composite current collector.A full battery was assembled with lithium manganate as the positive electrode active material and sodium titanium phosphate as the negative electrode active material.The discharge mass specific capacity of the battery was 57.73m Ah/g,and the capacity retention rate was 76.99%after 200 cycles.