High power nickel-hydrogen accumulator negative electrode active substance and its preparation method and nickel-hydrogen accumulator

A negative electrode active material, a technology for nickel-metal hydride batteries, which is applied in the direction of alkaline battery electrodes, battery electrodes, electrode manufacturing, etc. and other problems, to achieve the effects of good oxidation resistance, improved high current discharge performance, good electrical contact and electrochemical activity

Inactive Publication Date: 2009-03-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It leads to the reduction of the high current discharge platform (discharge power) of the battery, and eventually leads to the premature failure of the battery
[0004] In order to slow down the oxidation of the negative electrode, one of the traditional methods is to use high-temperature alkali treatment to dissolve the Mn and Al elements on the alloy surface into the solution, so that the Ni element is relatively enriched on the surface, thereby improving the oxidation resistance of the alloy powder, but the improvement of this method The effect is very limited
In addition, electroless plating is used for hydrogen storage alloys, and the reducing agent is sodium hypophosphite or sodium borohydride. However, taking electroless nickel plating as an example, the NI-P or NI-B alloy formed on the surface of alloy powder by electroless plating will reduce Alloy Surface Conductivity and Electrochemical Activity

Method used

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  • High power nickel-hydrogen accumulator negative electrode active substance and its preparation method and nickel-hydrogen accumulator
  • High power nickel-hydrogen accumulator negative electrode active substance and its preparation method and nickel-hydrogen accumulator

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The hydrogen storage alloy master powder to be treated MmNi 3.55 co 0.75 mn 0.4 Al 0.3 (Mm represents a mixed rare earth composed of one or more of La, Ce, Pr, and Nd) is placed in a special magnetron sputtering coating machine, and the hydrogen storage alloy mother powder can be produced by known methods. The coating machine adopts planar magnetron sputtering target, and the target material is nickel, palladium, platinum, gold, rhodium and other metals that are not easy to be completely oxidized by oxygen, and is easy to dissolve in alkaline aqueous solution with aluminum and zinc. An alloy formed by a combination of one or two metals. In this example, nickel-aluminum alloy is preferred, wherein the preferred proportion of aluminum is 30% (atomic ratio), the target is set vertically and horizontally, the target height is about 3m, and the single processing capacity of the coating machine is 200kG. The powder to be treated falls freely from the top of the coating ma...

Embodiment 2

[0027] Embodiment 2: The difference from Step 1 of Embodiment 1 is that the hydrogen storage alloy powder is sputtered twice in a vacuum sputter coating machine. The thickness of the film on the surface of the alloy is measured to be about 0.05 μm, and then the second step is performed, and the specific surface after treatment is about 0.15 m 2 / g, the battery is made through Step 3, which is recorded as Class B;

Embodiment 3

[0029] The difference from Step 1 of Example 1 is that the hydrogen storage alloy powder is sputtered 15 times in a vacuum sputter coater. Measure the thickness of the film on the surface of the alloy to be about 0.5 μm, and then carry out the second step of treatment, and the specific surface after treatment is about 0.8m 2 / g, the battery is made through Step 3, which is recorded as Class C;

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Abstract

The invention relates to a high-power nickel hydrogen accumulator negative active material, relative preparation and nickel hydrogen accumulator, wherein it deposits one layer of alloy film on the surface of hydrogen storage alloy powder which comprises one or the combination of nickel, palladium, platinum, gold, and rhodium which can not be oxidized by oxygen, and the combination between one or two of metal aluminum and zinc which can be dissolved in alkali solution, to form porous structure that contains one or more of nickel, palladium, platinum, gold and rhodium on the surface of hydrogen storage alloy. The preparation comprises: depositing one layer of alloy film on the surface of hydrogen storage alloy powder; arranging the powder in high-temperature alkali to be treated to form said porous structure on its surface; the negative surface of accumulator is coated with said negative active material. The invention can improve the anti-oxidization property of cathode of nickel hydrogen accumulator.

Description

technical field [0001] The invention relates to a negative active material for a nickel-hydrogen battery, in particular to a negative active material for a high-power nickel-hydrogen battery, a preparation method thereof, and a nickel-hydrogen battery. Background technique [0002] AB 5 (LaNi 5 ) hydrogen storage alloy, in the charging and discharging process of the battery, due to the local severe polarization or overcharging of the positive electrode of the battery, the positive electrode reaches the oxygen evolution potential, thereby generating oxygen. The generated oxygen passes through the diaphragm and reaches the negative electrode, a part of the oxygen recombines at the negative electrode to form water, and there is always a part of the oxygen that cannot be recombined and oxidizes the hydrogen storage alloy. After the surface of the alloy powder is oxidized, the electrical contact and electrochemical activity of the powder decrease, which is the main reason for t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/04H01M4/26H01M10/24
CPCY02E60/124Y02E60/10
Inventor 颜海鹏
Owner BYD CO LTD
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