Surface treating method for hydrogen occluding alloy

A hydrogen storage alloy and surface treatment technology, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problem of insufficient research on cycle life of hydrogen storage alloy and high rate discharge performance of hydrogen storage alloy sufficient and other problems to achieve the effect of improving electrochemical performance, good plasticity, and inhibiting pulverization

Inactive Publication Date: 2009-01-07
NANJING UNIV OF TECH
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Problems solved by technology

However, this article does not involve the process parameters of the treatment, and the research on the high-rate discharge performance of the hydrogen storage alloy is not sufficient, and it does not involve the research on the cycle life of the hydrogen storag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] 1) Fluorination treatment: prepare an aqueous solution containing 0.6ml of 40% hydrofluoric acid and 0.1 mole potassium fluoride in one liter of treatment solution. Heat the solution to 60°C and add 10g of LaNi prepared by melting 4 Al rare earth-based hydrogen storage alloy powder. Stir with a plastic stirring rod for 30 minutes.

[0018] 2) Borohydride treatment: immediately after the fluorination treatment is completed, add 0.08 moles of potassium borohydride to the fluorination treatment solution and stir.

[0019] 3) The hydrogen storage alloy powder treated in the above steps is washed with water, washed with absolute ethanol, filtered by suction and dried, and then added to the prepared electroless plating solution for electroless nickel plating. The composition of the plating solution is: nickel sulfate, 18g / L; sodium hypophosphite, 25g / L; complexing agent, 38g / L; thiourea, 0.001g / L. The pH value of the plating solution is adjusted to 9 with ammo...

Example Embodiment

[0022] Example 2:

[0023] 1) Fluorination treatment: Prepare an aqueous solution containing 0.9 ml of 40% hydrofluoric acid and 0.18 moles of sodium fluoride in one liter of treatment solution. Heat the solution to 75℃ and add 10g of commercially available MmNi 3.8 Co 0.75 Mn 0.4 Al 0.2 Rare earth-based hydrogen storage alloy (sale unit: Ningbo Shenjiang Technology Co., Ltd.). Stir with a plastic stirring rod for 20 minutes.

[0024] 2) Borohydride treatment: After the fluorination treatment is completed, add 0.09 mole of sodium borohydride to the fluorination treatment solution immediately and stir.

[0025] 3) The hydrogen storage alloy powder treated in the above steps is washed with water, washed with absolute ethanol, filtered by suction and dried, and then added to the prepared electroless plating solution for electroless copper plating. The composition of the plating solution is: copper sulfate, 12g / L; sodium hypophosphite, 12g / L; ethylenediamine tetraethyl disodium, 24g / L...

Example Embodiment

[0028] Example 3:

[0029] 1) Fluorination treatment: Prepare an aqueous solution containing 0.75 ml of 40% hydrofluoric acid and 0.15 mole potassium fluoride in one liter of treatment solution. The solution was heated to 70° C., and 5 g of TiNi titanium-based hydrogen storage alloy powder prepared by mechanical ball milling was added. Stir with a plastic stirring rod for 25 minutes.

[0030] 2) Borohydride treatment: After the fluorination treatment is completed, immediately add 0.1 mole of potassium borohydride to the fluorination treatment solution and stir.

[0031] 3) The hydrogen storage alloy powder treated in the above steps is washed with water, washed with absolute ethanol, filtered by suction and dried, and then added to the prepared electroless plating solution for electroless nickel plating. The composition of the plating solution is: nickel sulfate, 20g / L; sodium hypophosphite, 30g / L; complexing agent, 40g / L; thiourea, 0.001g / L. The pH value of the plating solution i...

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Abstract

The invention relates to a surface processing method of metal hydride. The surface processing method comprises fluoridation, hydroborate processing and chemical plating. A close coating is formed on the surface of metal hydride powder after being processed by the surface processing method and the close coating has high catalytic activity, good plastic property and strong corrosion resistance so as to improve the charge discharge efficiency of the metal hydride, reduce a charging platform, raise a discharging platform and increase the discharge capacity of the metal hydride. As a result, the high-rate discharge property of the metal hydride is greatly improved and the cycle life of the metal hydride is prolonged.

Description

technical field [0001] The invention belongs to the field of energy and relates to a surface treatment method of a hydrogen storage alloy. Background technique [0002] Ni-MH secondary batteries involve a series of issues such as energy, materials, chemistry and environmental protection. In recent years, nickel-metal hydride secondary batteries have attracted widespread attention in high-power electric tools such as electric vehicles, which puts forward higher requirements for the electrochemical performance of batteries. The hydrogen storage alloy, which is the main component of the anode material of the Ni-MH battery, plays a decisive role in the performance of the battery (discharge capacity, high rate discharge and cycle life). Therefore, improving the electrochemical performance of hydrogen storage alloys is the key to improving battery performance. Changing the composition, organization and structure of alloys and establishing new alloy systems have attracted the att...

Claims

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Application Information

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IPC IPC(8): C23C18/31C23C18/18
Inventor 马立群赵相玉丁毅杨猛张玉洁
Owner NANJING UNIV OF TECH
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