Surface treatment method for hydrogen storage alloy

A hydrogen storage alloy and surface treatment technology, which is applied in metal material coating technology, liquid chemical plating, coating, etc., can solve the problems of poor stability, poor reactivity, and easy oxidation of cuprous compounds, and achieve high performance Excellent, effective and reasonable use, and performance-enhancing effects

Inactive Publication Date: 2014-05-21
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cuprous compounds are less stable and are easily oxidized. For example, white CuCl will be oxidized and turn blue after being placed for a long time; in addition, some stable cuprous compounds a

Method used

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  • Surface treatment method for hydrogen storage alloy
  • Surface treatment method for hydrogen storage alloy
  • Surface treatment method for hydrogen storage alloy

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example 1:

[0027] First, weigh a certain amount of hydrogen storage alloy powder and grind it through a sieve to control its particle size in the micron level; under the protection of nitrogen, add an aqueous solution of HF and NaF with a pH of about 0.05 mol / L and a pH of 3 to control the reaction process. The pH value of the medium solution is not less than 6, and react at room temperature for 5 minutes to obtain a suspension of hydrogen storage alloy powder from which the surface oxide film or hydroxide film is removed. After filtering or centrifuging the above suspension to remove the solution, add a certain amount of air-removed water to the obtained alloy solid (the amount of water is at least enough to stir the solid), raise the temperature to 50 ℃, and then add CuCl while stirring For the water dispersion, the CuCl mass is controlled to be 0.125 times the mass of the hydrogen storage alloy powder, and the sum of the masses of the hydrogen storage alloy powder and...

Example Embodiment

[0030] Example 2:

[0031] First, under the protection of argon, weigh a certain amount of hydrogen storage alloy powder with a particle size of several microns, and add 0.1 mol / L, pH 2 hexamethylenetetramine hydrochloride and hexamethylenetetramine For the aqueous dispersion of amine solution, the pH value of the solution during the reaction is controlled to not be lower than 5, otherwise more solid hexamethylenetetramine hydrochloride needs to be added. The reaction was carried out at room temperature for 10 minutes to obtain a suspension of hydrogen storage alloy powder from which the surface oxide film or hydroxide film was removed. Filter or centrifuge the above suspension to remove the solution, then add a certain amount of air-removed water to the obtained alloy solid (the amount of water added is at least to be able to stir the solid), heat up to 100 ℃, and then add CuI water dispersion while stirring Liquid, the mass of CuI is controlled to be 0.2 times the mass of the ...

Example Embodiment

[0032] Example 3:

[0033] First, weigh a certain amount of hydrogen storage alloy powder under the protection of argon, and add a 0.2mol / L, pH 6 mixed aqueous solution of ammonium chloride and ammonia to control the pH of the solution to not less than 6 during the reaction. React at room temperature for 60 minutes to obtain a suspension of hydrogen storage alloy powder from which surface oxide film or hydroxide film has been removed. Secondly, under the protection of argon, filter or centrifuge the above suspension to remove the solution, and then add a certain amount of de-aired water to the obtained alloy solid (the amount of water added is at least enough to stir the solid), and then stir at room temperature. Join Cu 2 Water dispersion of O to control Cu 2 The mass of O is 0.01 times the mass of hydrogen storage alloy powder, and the hydrogen storage alloy powder and Cu 2 The sum of the mass of O is 0.12 times the mass of water removed from air. Due to Cu 2 O has poor reacti...

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Abstract

The invention discloses a surface treatment method for hydrogen storage alloy. The surface treatment method comprises the following steps of cleaning the hydrogen storage alloy through a weak acid solution under the protection of inert atmosphere for 5 minutes to 1 hour so as to remove hydroxide or oxide from the surface of the hydrogen storage alloy; then adding water subjected to air removal into the hydrogen storage alloy under the protection of the inert atmosphere, stirring and controlling the liquid temperature to be between room temperature and 100 DEG C, and adding a cuprous compound for reaction so as to obtain the hydrogen storage alloy with the copper-cladded surface. The surface treatment method has the advantages that copper is plated on the surface of the hydrogen storage alloy by the cuprous compound, so that reaction is easy to implement; the content of the consumed hydrogen storage alloy is relatively reduced, and the hydrogen storage alloy is effectively and reasonably used; according to the hydrogen storage alloy with high performance and modified surface, which is obtained by the method disclosed by the invention, the performance of a negative electrode of a nickel-metal hydride battery is greatly improved.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, in particular to a surface treatment method for the hydrogen storage alloy. Background technique [0002] Nickel metal hydride battery, also known as nickel-metal hydride battery, is a water-based alkaline secondary battery with high power characteristics, and is currently widely used in electric tools and hybrid vehicles. Compared with lithium-ion batteries, its energy density is slightly worse, but its safety is better; compared with nickel-cadmium batteries, its life is relatively long, and it is less harmful to the environment. The hydrogen storage alloys currently used in the manufacture of nickel-metal hydride batteries are mainly divided into two categories, the most common one is AB 5 type, the other is AB 2 type. Nickel hydroxide is used industrially as the cathode material, AB 5 Type hydrogen storage alloy is used as the negative electrode material. When charging, the positive nickel hydr...

Claims

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Application Information

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IPC IPC(8): H01M4/28
CPCC23C18/38H01M4/366H01M4/38H01M4/383Y02E60/10
Inventor 雷立旭况桂芝王千秋
Owner SOUTHEAST UNIV
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