Method for preparing aluminum trioxide-nickel oxide ceramic coating on nickel electrode surface

Abstract

The invention discloses a method for preparing an aluminum trioxide-nickel oxide ceramic coating on a nickel electrode surface. A preformed coating (chemical conversion coating) is produced on a metal nickel surface by a rare-earth conversion process, and the nickel electrode subjected to rare-earth conversion treatment is arranged in a sodium-aluminate-containing electrolyte. The micelle formed by hydrolyzing the sodium aluminate can be adsorbed to the surface of the chemical conversion coating to form a complete barrier layer. The method disclosed by the method prepares the aluminum trioxide-nickel oxide ceramic coating on the nickel electrode surface of a nickel-hydrogen battery by a microarc oxidation technique, thereby effectively relieving the problem of corrosion of the nickel electrode in the electrolyte. The coating with the surface features of coarseness and porosity enhances the adhesive power of active substances, and relieves the problem of lower capacity of the nickel-hydrogen battery caused by shedding of the active substances of the nickel electrode. The method has the advantages of simple and reliable technique and no environmental pollution, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of nickel-hydrogen batteries, and more specifically relates to a method for preparing aluminum oxide and nickel oxide ceramic coatings on the surface of nickel electrodes. Background technique [0002] Ni-MH batteries have been widely used in notebook computers, camcorders, digital cameras and other fields due to their advantages of high energy density, fast charging and discharging, long cycle life and no pollution. [0003] The performance of nickel-metal hydride batteries will gradually decay during use, and there are many reasons for battery failure, among which the corrosion of nickel electrodes is more common. [0004] In order to promote the improvement of the performance of Ni-MH batteries, the research on the corrosion protection of Ni-MH batteries has never stopped. Since the interior of the nickel-metal hydride battery is an alkaline environment, during the charging and discharging process of the...

AI Technical Summary

Problems solved by technology

Since the interior of the nickel-metal hydride battery is an alkaline environment, during the charging and discharging process of the nickel-hydrogen battery, a series of chemical and physical changes occur in the surface active substances, and the corrosion solution penetrates into the surface of the metal nickel electrode, causing the nickel electrode to corrode and expand, causing the surface The active material powder is loose, falling off or not in good contact, which increases the internal resistance and reduces the battery capacity, eventually causing the battery to fail prematurely

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