Sheet-like zinc anode, method for preparing sheet-like zinc anode and laminated zinc-manganese battery using sheet-like zinc anode

Abstract

The invention relates to a sheet-like zinc anode, a method for preparing the sheet-like zinc anode and a laminated zinc-manganese battery using the sheet-like zinc anode. The sheet-like zinc anode consists of 0.002 to 0.01 percent of titanium or manganese, 0.001 to 0.005 percent of aluminum, 0.002 to 0.01 percent of indium, and the balance of zinc and unavoidable impurities. The method for preparing the sheet-like zinc anode comprises the following steps of: preparing intermediate alloy; preparing zinc anode alloy; and calendaring for many times, and thus obtaining the sheet-like zinc anode. The laminated zinc-manganese battery comprises a plurality of single-sheet batteries which are laminated together, wherein the single-sheet batteries are connected in series with one another, and then positive terminals and negative terminals are led out; each single-sheet battery comprises the sheet-like zinc anode, an active manganese mixed positive material, an electrolyte and a polyvinyl chloride (PVC) film; the active manganese mixed positive material and the electrolyte are placed on an isolation film of the sheet-like zinc anode; and the PVC film is coated outside the active manganese mixed positive material and the electrolyte. Compared with the prior art, the invention has the advantages that: on the premise of no addition of lead and cadmium in the sheet-like zinc anode, an environment-friendly sheet-like zinc anode laminated zinc-manganese battery is manufactured; and under the conditions of guaranteeing the extensibility, corrosion resistance, mechanical strength and hardness of the sheet-like zinc anode, the discharge performance and storage performance of the battery can be equal to those of the conventional battery.

Description

technical field [0001] The invention relates to the field of dry batteries, in particular to a sheet-shaped zinc anode, a preparation method thereof and a laminated zinc-manganese battery using the sheet-shaped zinc anode. Background technique [0002] The conventional production method of flake zinc anode is: adding 0.30-0.80wt% lead and 0.020-0.035wt% cadmium to pure zinc, or adding a small amount of mercury to further reduce the corrosion of zinc anode. Among them, the addition of lead can enable the zinc anode to obtain continuous multi-pass rolling, improve the ductility of zinc and reduce the corrosion of zinc, and the addition of cadmium can make the zinc anode obtain mechanical strength and hardness, and increase the hydrogen evolution potential and reduce corrosion. Adding mercury can reduce impurities Corrosion of metal to zinc, preventing zinc anode pitting corrosion. [0003] As we all know, the melting points of lead and cadmium are relatively low. When these m...

AI Technical Summary

Problems solved by technology

[0003] As we all know, the melting points of lead and cadmium are relatively low. When these metals are added, lead gas and cadmium gas are easily generated, causing harm to the production environment and personal health; create pollution

Although mercury is no longer added to flake zinc anodes, the added cadmium and lead are very effective components for batteries, which are difficult to eliminate, especially the amount of lead added in flake zinc anodes is still high

[0004] If no cadmium is added to the flake zinc anode, although it can be rolled into zinc flakes, it cannot meet the mechanical strength and hardness requirements of the flake zinc anode. If lead is not added at the same time, the zinc anode has poor ductility and cannot be rolled into zinc flakes, and The corrosiveness of zinc increases, and the performance requirements of the battery cannot be met

In response to these problems, it was proposed to add elements such as indium, bismuth, aluminum, magnesium, calcium, silicon, nickel, manganese, zirconium, titanium or rare earth to the negative electrode shell of the cylindrical zinc-manganese battery or the negative electrode zinc powder of the alkaline battery to form a Cadmium-free and lead-free zinc alloys, such as the technical solutions proposed by JP6-302323A, US5425913A, CN1004778B, etc.; but the zinc alloys in these patented technologies are not involved and do not solve the problem that the sheet zinc anode must be rolled continuously for multiple passes. It is zinc flake process and high melting point metal such as nickel, manganese, zirconium, titanium master alloy technology; as we all know, multi-element alloy melting is very complicated, some elements are added or element content changes or element combination is improper, and the process conditions are different, namely It will change the physical properties, mechanical properties and electrochemical properties of the alloy, and may even cause the alloy to deteriorate and cannot be processed smoothly; the combination of alloying elements, the effect of the addition amount on the flake zinc anode and the effect of the flake zinc anode have not been disclosed in the prior art. Research on the influence of other impurities in the anode

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