Nickel-hydrogen-cell wet net-cutting-pulling negative electrode and preparing technology

Abstract

This invention relates to a wet method negative pole of a NiH battery and its preparation method, in which, the technological plan includes a wet-cutting-pulling net negative pole of NiH battery containing a cathode slurry-coated carrier and a cathode active substance slurry adhered on the carrier, which is an cutting-pulling metal net, the component of the slurry contains AB5 rich La H2 storage alloy powder, carbon black, 1.8% of HPMC water solution and SBR adhesive, the preparation method includes: 1, preparing the HPMC solution, 2, preparing the slurry, 3, sizing, 4, preforming, 5, cutting the plates, 6, weighing and arranging.

Description

technical field [0001] The present invention relates to the structure and manufacture of a nickel-hydrogen cylindrical alkaline secondary battery, in particular to a negative electrode of a nickel-hydrogen battery wet-cut drawn mesh and a manufacturing process thereof. Background technique [0002] Hydrogen storage alloys are materials that can reversibly absorb and release a large amount of hydrogen under certain temperature and pressure conditions. In metal hydride / nickel batteries (MH / Ni batteries), hydrogen storage alloys are used as negative electrodes and are the key materials of the batteries. The battery electrolyte is KOH aqueous solution. During charging, the hydrogen ions generated by water electrolysis are adsorbed on the surface of the negative electrode, and diffuse into the electrode body to react with the hydrogen storage alloy to generate metal hydride MHx. Since both hydrogen storage alloys and metal hydrides are good electrical conductors, when the curren...

AI Technical Summary

Problems solved by technology

The nickel-plated perforated stainless steel strip has a planar structure, and the slurry can only be attached to the surface of the steel strip. Due to the low surface roughness of the steel strip, the slurry does not adhere firmly to the steel strip, causing the negative electrode active material to change from The steel belt falls off, reducing the service life of the battery;

[0008] 2) The charge and discharge polarization of the battery is large

Due to the poor conductivity caused by the insufficient adhesion of the steel belt and the negative electrode active material, the chemical reaction polarization is large during the charging and discharging process of the battery, resulting in insufficient reaction, reducing the capacity of the battery and wasting resources;

[0009] 3) The process is complex and wasteful

The shortcoming of this kind of dry-cut mesh negative electrode is mainly manifested in that it is easy to drop powder, which will cause a micro-short circuit inside the battery during use, resulting in low voltage or even zero voltage phenomenon.

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