Steel shell of alkaline zinc-manganese dioxide cell and alkaline zinc-manganese dioxide cell

Abstract

The invention discloses a steel shell of an alkaline zinc-manganese dioxide cell. The steel shell of the alkaline zinc-manganese dioxide cell comprises a current collector steel shell, wherein the inner wall of the current collector steel shell is coated with a graphene-modified conductive coating, and the thickness of the conductive coating is 0.01 microns to 20 microns. The coverage density and the adhesive property between the conductive coating and the inner surface of the steel shell are improved; the radial resistance of a cell and the interface resistance between an anodal ring and the steel shell are reduced; by using the steel shell of the alkaline zinc-manganese dioxide cell, the high-current discharge performance of the alkaline zinc-manganese dioxide cell is further improved.

Description

technical field [0001] The invention relates to the technical field of a conductive coating that can be used for a steel shell of an alkaline zinc-manganese battery, in particular to a steel shell of an alkaline zinc-manganese battery. Background technique [0002] Alkaline zinc-manganese battery is mainly composed of five parts: negative electrode, diaphragm paper, electrolyte, and shell; the negative electrode of alkaline zinc-manganese battery is mainly composed of zinc powder, water-absorbing polymer as gel agent, and KOH dissolved in ZnO as electrolyte The prepared slurry mixture. The positive electrode is mainly manganese dioxide (MnO2), graphite, adding an appropriate amount of binder or release agent and KOH electrolyte, and mixing evenly to form a positive electrode mixture with a ring structure after tableting, granulation, and ringing. The separator paper is a special porous membrane, and the electrolyte is made of KOH solution. The shell is a sealing device for...

AI Technical Summary

Problems solved by technology

Through a lot of experiments, we found that in order to meet the anti-corrosion and anti-oxidation requirements of the inner surface of the steel shell, the thickness of the coating should not be less than 5-50 μm when using the conductive coating of the above manufacturers. It will lead to a decrease in battery capacity; due to the use of a hydrophobic protective film on the inner surface of the steel shell, long-term storage of the battery, and the decline in the bonding performance of the polymer binder, the adhesion between the ordinary carbon material-based conductive coating and the steel shell It will gradually decrease and the conductive coating will absorb liquid to produce irreversible expansion. The conductive coating will fall off, resulting in a further increase in interface resistance and a significant drop in battery storage and storage. At present, the alkaline manganese batteries produced by general manufacturers have a shelf life of 3-4 years. The resistance increases by 3-4 times, and the high-current discharge performance decreases by 30% to 50%.

[0005] In conclusion, the current paints / coatings with graphite or carbon black as the conductive matrix are widely used in steel shells of alkaline manganese batteries, but we found that due to their limited coverage density and protection ability on the inner surface of steel shells, a higher thickness is required , and a higher coating thickness (5-50 μm) leads to an increase in the radial resistance of the steel shell and a decrease in battery capacity, and at the same time the bonding performance of the conductive coating to the steel shell is reduced, which eventually leads to a decrease in the battery's high-current discharge performance and storage performance , does not meet the needs of the current development of new digital electrical products, which greatly restricts the further expansion of the alkaline zinc-manganese battery market

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