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Method for treating surface of hydrogen storage alloy powder for cathode of nickel-hydrogen battery

A technology of hydrogen storage alloy powder and nickel-metal hydride batteries, which is applied in the direction of alkaline battery electrodes, etc., can solve the problems of battery service life attenuation, electrochemical corrosion, etc., and achieve the effects of prolonging service life, simple operation and improving corrosion resistance

Inactive Publication Date: 2012-05-09
NINGBO SHENJIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the interior of the Ni-MH battery is in an alkaline environment, the charge-discharge cycle of the battery will cause electrochemical corrosion to the hydrogen storage alloy powder used for the negative electrode of the battery, which further causes the attenuation of the service life of the battery.

Method used

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  • Method for treating surface of hydrogen storage alloy powder for cathode of nickel-hydrogen battery
  • Method for treating surface of hydrogen storage alloy powder for cathode of nickel-hydrogen battery
  • Method for treating surface of hydrogen storage alloy powder for cathode of nickel-hydrogen battery

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Experimental program
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Effect test

Embodiment 1

[0025] (1) absolute ethanol, hydrogen storage alloy powder (commercially available 3% (mass ratio) AB of Co content 5 Type hydrogen-storage alloy powder, the hydrogen-storage alloy powder of crossing 200 mesh sieves) and orthosilicate ethyl ester are added in the reaction vessel successively in the above order, and the mass ratio of above-mentioned hydrogen-storage alloy powder, dehydrated alcohol and orthosilicate ethyl ester is 1 :5:0.05;

[0026] (2) Then heat the above reaction mixture at 80°C and stir until the absolute ethanol is volatilized. At this time, a uniform Si(OCH 2 CH 3 ) 4 film, a uniform Si(OCH 2 CH 3 ) 4 The hydrogen storage alloy powder of the film is exposed to the air for 48 hours to make it absorb the moisture in the atmosphere, then Si(OCH 2 CH 3 ) 4 Formation of SiO on the surface of hydrogen storage alloy powder through hydrolysis and polycondensation 2 gel film;

[0027] (3) Form SiO on the surface in step (2) 2 The hydrogen storage alloy ...

Embodiment 2

[0029] In this embodiment, the mass ratio of hydrogen storage alloy powder, absolute ethanol and tetraethyl orthosilicate is 1:5:0.08, and the others are the same as in Embodiment 1.

Embodiment 3

[0031] In this embodiment, the mass ratio of hydrogen storage alloy powder, absolute ethanol and tetraethyl orthosilicate is 1:10:0.1, and the others are the same as in Embodiment 1.

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Abstract

The invention discloses a method for treating the surface of hydrogen storage alloy powder for the cathode of a nickel-hydrogen battery, comprising the following steps: weighing, heating and stirring a certain amount of hydrogen storage alloy powder, absolute ethanol and tetraethoxysilane until all absolute ethanol volatilizes, hydrolyzing and polycondensating tetraethoxysilane film evenly coatedon the surface of the hydrogen storage alloy powder in the air until an SiO2 gel film forms on the surface of the hydrogen storage alloy powder; putting the hydrogen storage alloy powder in a vacuum furnace, slowing heating the hydrogen storage alloy powder and preserving the heat of the hydrogen storage alloy powder to obtain the hydrogen storage alloy powder of which the surface is treated. Compared with the prior method for treating the surface of the hydrogen storage alloy powder, the method for surface of hydrogen storage alloy powder is easy to operate, can ensure that the original components of the hydrogen storage alloy powder are not changed and can greatly prolong the cycle life of the hydrogen storage alloy powder and the corrosion resistance capacity of the hydrogen storage alloy powder in the alkaline solution environment.

Description

technical field [0001] The invention relates to the technical field of nickel-hydrogen battery materials, in particular to a method for surface treatment of hydrogen-storage alloy powder for negative electrodes of nickel-hydrogen batteries. Background technique [0002] Due to the advantages of safe use and environmental friendliness, Ni-MH batteries have been widely used in communication and digital products, electric tools, instruments, toys and other fields. However, since the interior of the nickel-metal hydride battery is in an alkaline environment, the charging and discharging cycle of the battery will cause electrochemical corrosion to the hydrogen storage alloy powder used for the negative electrode of the battery, thereby further causing the attenuation of the service life of the battery. Therefore, the corrosion resistance and cycle life of nickel-hydrogen batteries have always been the main breakthrough for them to replace nickel-cadmium batteries, dry batteries, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26
CPCY02E60/124Y02E60/10
Inventor 蒲朝辉李志林黄铁生朱云浩
Owner NINGBO SHENJIANG TECH