Method of preparing aluminum-substituted alfa-nickel hydroxide coated with beta-nickel hydroxide

A technology of nickel hydroxide and sodium hydroxide, applied in the direction of alkaline storage battery electrodes, etc., can solve the problems of deterioration of electrochemical performance, attenuation of electrode performance, etc., and achieve the effects of low cost of raw materials, improved phase stability, and good electrochemical activity.

Inactive Publication Date: 2015-03-25
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, α-nickel hydroxide is easily converted to β-nickel hydroxide in a strongly alkaline electrode process, and the electrochemical performance also deteriorates.
Partially replacing nickel ions with aluminum ions can produce relatively stable aluminum-substituted α-nickel hy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dissolve nickel sulfate and aluminum sulfate with a nickel-aluminum molar ratio of 5:1 in distilled water to prepare a mixed solution with a nickel ion concentration of 1mol / L.

[0016] (2) Dissolve potassium hydroxide with distilled water to prepare an alkaline solution with a potassium hydroxide concentration of 5 mol / L.

[0017] (3) Dissolve nickel sulfate in distilled water to prepare a nickel salt solution with a nickel ion concentration of 0.1 mol / L.

[0018] (4) control reaction temperature is 60 ℃, under agitation condition, step (2) gained potassium hydroxide is added dropwise in the mixed solution containing nickel, aluminum ion of step (1) gained, control rate of addition, make the reaction system Keep the pH value at 12.0, stop stirring after 3 hours of reaction, and age the obtained precipitate in the mother liquor at 60°C for 10 hours, suction filter after aging, wash with distilled water until neutral, dry at 60°C to constant weight, and obtain alumin...

Embodiment 2

[0022] (1) Dissolve nickel sulfate and aluminum nitrate with a nickel-aluminum molar ratio of 5:1 in distilled water to prepare a mixed solution with a nickel ion concentration of 2 mol / L.

[0023] (2) Dissolve sodium hydroxide with distilled water to prepare an alkali solution with a concentration of sodium hydroxide of 4 mol / L.

[0024] (3) Dissolve nickel nitrate in distilled water to prepare a nickel salt solution with a nickel ion concentration of 0.2 mol / L.

[0025] (4) control reaction temperature is 60 ℃, under agitation, the sodium hydroxide solution prepared by step (2) is added dropwise in the mixed solution containing nickel and aluminum ions prepared by step (1), and the rate of addition is controlled. Keep the pH value of the reaction system at 11, stop stirring after 3 hours of reaction and age the obtained precipitate in the mother liquor at 60°C for 10 hours, filter it with suction after aging, wash with distilled water until neutral, and dry at 60°C until con...

Embodiment 3

[0029] (1) Dissolve nickel nitrate and aluminum sulfate with a nickel-aluminum molar ratio of 5:1 in distilled water to prepare a mixed solution with a nickel ion concentration of 3 mol / L.

[0030] (2) Dissolve potassium hydroxide with distilled water to prepare an alkali solution with a potassium hydroxide concentration of 3 mol / L.

[0031] (3) Dissolve nickel sulfate in distilled water to prepare a nickel salt solution with a nickel ion concentration of 0.3 mol / L.

[0032] (4) control reaction temperature is 60 ℃, under stirring condition, the potassium hydroxide solution prepared by step (2) is added dropwise in the mixed solution containing nickel and aluminum ion prepared by step (1), control the rate of addition, Keep the pH value of the reaction system at 10, stop stirring after 2 hours of reaction and age the obtained precipitate in the mother liquor at 60°C for 10 hours, suction filter after aging, wash with distilled water until neutral, and dry at 60°C until consta...

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PUM

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Abstract

The invention discloses a method of preparing aluminum-substituted alfa-nickel hydroxide coated with beta-nickel hydroxide. The method comprises the steps of: dissolving nickel salt and aluminum salt in a 5:1 molar ratio of nickel to aluminum by using distilled water to prepare a mixture liquid; dissolving potassium hydroxide or sodium hydroxide in the distilled water to prepare alkaline solution of sodium hydroxide or potassium hydroxide; dropwise adding the alkaline solution into the mixture liquid, controlling a pH value, reacting, perform extraction filtration, washing, and drying to obtain aluminum-substituted alfa-nickel hydroxide powder; mixing aluminum-substituted alfa-nickel hydroxide with nickel ions, perform ultrasonic dispersion, dropwise adding the alkaline solution into the nickel salt solution which contains the aluminum-substituted alfa-nickel hydroxide, controlling the pH value, reacting, perform extraction filtration, washing, and drying to obtain the aluminum-substituted alfa-nickel hydroxide coated with the beta-nickel hydroxide. The method is simple in process and easy to control, the cost of raw materials is low, and the utilization rate and cycle performance of the aluminum-substituted alfa-nickel hydroxide coated with the beta-nickel hydroxide serving as an anode material active substance of a nickel-metal hydride battery are excellent.

Description

technical field [0001] The present invention relates to a kind of preparation method of battery material, particularly relate to alkaline nickel-based secondary battery, such as the positive electrode material nickel hydroxide (Ni(OH) 2 ) method of preparation. Background technique [0002] Nickel-hydrogen batteries are considered to be the preferred power batteries for electric vehicles due to their excellent comprehensive characteristics such as good safety, high energy density, low price and environmental friendliness. In a nickel-hydrogen battery, the performance of the positive active material is the key to improving the overall performance of the battery. Especially as a power battery for electric vehicles, the specific capacity of the nickel electrode needs to be further improved. At present, β-nickel hydroxide is widely used as the positive electrode active material of nickel-hydrogen batteries. After years of development, its actual electrochemical capacity is clos...

Claims

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Application Information

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IPC IPC(8): H01M4/32H01M4/26
CPCH01M4/26H01M4/32Y02E60/10
Inventor 李延伟姚金环潘观林肖建荣刘长久张灵志
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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