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Alloy powder for electrode and manufacture method thereof

A technology of alloy powder and manufacturing method, which is applied in electrode manufacturing, battery electrode, active material electrode, etc., can solve the problems of shortening battery cycle life and increasing manufacturing cost, and achieve the effect of good high discharge rate characteristics and short time.

Inactive Publication Date: 2005-08-31
PANASONIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a problem in that multiple steps such as alkaline treatment, water washing, acid treatment, and water washing must be performed, resulting in increased manufacturing costs
In addition, since the final treatment is carried out in an acidic aqueous solution, although it is not as serious as the acid treatment in (1) above, there is still a problem that the cycle life of the battery is shortened.

Method used

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  • Alloy powder for electrode and manufacture method thereof
  • Alloy powder for electrode and manufacture method thereof
  • Alloy powder for electrode and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (i) Step 1

[0057] Mix Mm, Ni, Mn, Al and Co according to the specified ratio, and make the composition MmNi in a high-frequency furnace 4.1 mn 0.4 Al 0.3 co 0.4 hydrogen storage alloy ingots. Then, heat treatment was performed at 1060° C. for 10 hours in an argon atmosphere. After the alloy ingot was pulverized into coarse particles, the coarse particles were pulverized into particles with a particle size of 75 μm or less by a wet ball mill in the presence of water to obtain a raw material powder of hydrogen storage alloy with an average particle size of 20 μm.

[0058] Next, the obtained raw material powder is subjected to alkaline treatment. That is, the raw material powder is immersed in an aqueous solution of 70° C. to boiling point containing 20 to 80% by weight of NaOH, and stirred for 1 hour. Since the alloy powder produced by the wet ball mill contains moisture, the concentration of NaOH in the aqueous solution should be adjusted to a specified value tak...

Embodiment 2

[0117] Except that the raw material powder formed by the same hydrogen storage alloy used in Example 1 is immersed in the NaOH or KOH aqueous solution of the concentration and temperature shown in Table 3 at the time shown in Table 3, other operations are the same as in Example 1, and obtained Alloy powder for electrodes. Then, the magnetic substance content in the obtained alloy powder for electrodes was measured by the same method as Example 1, and the result is shown in Table 3.

[0118] alkaline substance

type

concentration

(wt%)

temperature

(℃)

time

(Hour)

Magnetic substance content

(wt%)

NaOH

30

90

1

1.5

2

2.3

3

3

40

110

1

3

2

4.5

3

6

80

boiling point

0.1

1.8

0.2

3

KOH

40

110

1

2

...

Embodiment 3

[0122] If reduce AB 5 If the amount of Co in the hydrogen storage alloy is low, the corrosion of the hydrogen storage alloy will be accelerated, and the battery life will tend to be shortened. On the other hand, since Co is an expensive metal, it is desired to reduce its usage.

[0123] In Example 1, more Co or Co compounds existed on the surface of the hydrogen storage alloy in the case of using the NaOH aqueous solution than in the case of using the KOH aqueous solution. The alloy powder for electrodes in this state can improve the corrosion resistance of the hydrogen storage alloy matrix in the battery.

[0124] Therefore, when the Co content in the hydrogen storage alloy used in Example 1 was reduced from 5.5% by weight to approximately half of 2.7% by weight, the effect of the present invention was confirmed. The hydrogen storage alloy used here has MmNi 4.0 mn 0.5 Al 0.3 Cu 0.3 co 0.2 composition. In the alkaline treatment, in addition to immersing the aforementi...

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Abstract

A method of producing an electrode alloy powder is disclosed, wherein, to provide an electrode alloy powder capable of yielding an alkaline storage battery excellent in high-rate discharge property, self-discharge property and cycle life, a first step of immersing a starting powder comprising a hydrogen storage alloy containing 20 to 70 wt% of Ni in an aqueous solution containing 30 to 80 wt% of sodium hydroxide at a temperature of 90 DEG C or higher and a second step of washing with water the powder which has been subjected to the first step are conducted.

Description

technical field [0001] The invention relates to an alloy powder for electrodes and a manufacturing method thereof. Background technique [0002] Since the theoretical capacity density of hydrogen storage alloy electrodes capable of reversibly absorbing and releasing hydrogen is higher than that of cadmium electrodes, there will be no deformation like zinc electrodes, and no dendrites will form, so the service life is long and pollution-free. In addition, due to its high energy density, it is widely used as a negative electrode of nickel-metal hydride storage batteries for power supplies for small portable electric appliances, etc., and further development is required in the future. [0003] In recent years, nickel-metal hydride storage batteries have also attracted attention as power sources for electric vehicles, etc., and further improvements in output power and storage characteristics are desired. [0004] As the negative electrode active material of nickel-metal hydride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/00B22F1/145C22C1/04H01M4/02H01M4/24H01M4/26H01M4/38H01M4/46H01M4/52H01M4/60
CPCY02E60/124H01M4/383H01M4/52B22F1/0088H01M4/60H01M4/46Y10S420/90H01M4/02H01M4/26C22C1/0441H01M4/242Y02E60/10B22F1/145B22F9/00
Inventor 冈田行广嘉山美穗辻庸一郎
Owner PANASONIC CORP
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