Surface treatment method for hydrogen-storing alloy powder

A technology of surface treatment and alloy powder, applied in the field of surface treatment of hydrogen storage alloy powder, can solve the problems of high current discharge performance and poor low temperature discharge performance, and achieve the effect of good low temperature discharge performance

Active Publication Date: 2008-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the high-current discharge performance and low-temperature discharge performance of nickel-hydrogen secondary batteries in the prior art, and pro

Method used

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  • Surface treatment method for hydrogen-storing alloy powder
  • Surface treatment method for hydrogen-storing alloy powder
  • Surface treatment method for hydrogen-storing alloy powder

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] This example illustrates the surface treatment method of the hydrogen storage alloy powder provided by the present invention.

[0027] 800 grams of alloy powder (Xiamen Tungsten Industry, MM03200, magnified 500 times by scanning electron microscope) shows the surface morphology figure 1 Shown) join in 2 liters of cobaltous sulfate aqueous solution, the content of the cobaltous sulfate in described cobaltous sulfate aqueous solution is 0.25% by weight, then add 8 grams of sodium hypophosphite, mix under stirring for 30 minutes, use Bühner funnel The solid matter was separated by suction filtration, spread the solid matter on a clean and dry plane with a thickness of about 10 mm, and stood in the air for 24 hours. Then this alloy powder is placed in 0.5 liters of sodium hydroxide solution, the concentration of described sodium hydroxide solution is 5 mol / liter, temperature is 80 ℃, contacts under stirring for 30 minutes, obtains solid matter with Buchner funnel suction fi...

Embodiment 2

[0032] The alloy powder was processed according to the method of Example 1, except that the content of cobaltous sulfate in the cobaltous sulfate aqueous solution was 0.5% by weight, and then 12 grams of sodium hypophosphite was added. The oxidation was carried out in an oxygen atmosphere for 5 hours. Alloy powder A2 was prepared.

Embodiment 3

[0034] The alloy powder is processed according to the method of Example 1, and the difference is that the cobaltous salt aqueous solution is a cobaltous chloride aqueous solution, and the content of the cobaltous chloride in the cobaltous chloride aqueous solution is 0.3% by weight, and then 15 grams of potassium hypophosphite. Alloy powder A3 was prepared.

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Abstract

A surface treatment method of hydrogen-storage alloy powder comprises the following steps of: oxidizing hydrogen-storage alloy powder, and contacting with an alkali solution, wherein the mixture of the hydrogen-storage alloy powder and a cobaltous salt solution is contacted with hypophosphite. A battery prepared from the hydrogen-storage alloy powder processed by the invention has good low-temperature discharge performance and large-current discharge performance.

Description

technical field [0001] The invention relates to a surface treatment method of hydrogen storage alloy powder. Background technique [0002] Nickel-metal hydride battery is a new type of battery developed on the basis of hydrogen storage alloy technology and nickel-cadmium battery technology in recent years. As a new energy carrier, it has become a research hotspot in the battery industry and represents the development direction of alkaline storage batteries. Because Ni-MH batteries have the advantages of high specific energy, high specific power, high-rate charge and discharge, wide temperature range, safe use, no memory effect, and no pollution to the environment, they are called green batteries. In today's energy shortage and environmental pollution, nickel-metal hydride batteries show broad application prospects. [0003] However, at present, nickel-hydrogen batteries cannot replace traditional nickel-cadmium batteries in the field of tool batteries that require high-curr...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C22/05C23C8/10B22F1/00H01M10/04
CPCY02E60/10Y02P70/50
Inventor 黄政益陈其祥覃建波
Owner BYD CO LTD
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