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Closed nickel-hydrogen storage battery and its production method

A nickel-metal hydride storage battery and a manufacturing method technology, applied to nickel storage batteries, alkaline storage batteries, battery electrodes, etc., can solve problems such as ineffective effects, and achieve the effects of improving performance, expanding application range, and good cycle performance

Active Publication Date: 2006-02-22
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the method of applying acid treatment after treatment with such an alkali solution, although the rare earth hydroxides during the above-mentioned alkali treatment are removed, in the case of using an alloy with a large particle size as in the case of only alkali treatment, the effect not big

Method used

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  • Closed nickel-hydrogen storage battery and its production method
  • Closed nickel-hydrogen storage battery and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0079] Synthesis of Nickel Hydroxide Particles

[0080] Nickel sulfate, zinc sulfate, and cobalt sulfate are dissolved in a mass ratio of metal hydroxides to be described later to form an aqueous solution, and ammonium sulfate and sodium hydroxide aqueous solution are added to the aqueous solution to form an ammonium complex. When the reaction system was stirred rapidly, further drip sodium hydroxide solution, the temperature of the reaction bath was controlled at 45 ± 2°C, the pH value was controlled at 12 ± 0.2, and the mass ratio of hydroxide was nickel: zinc: cobalt = 93:5:2 to synthesize spherical high-density nickel hydroxide particles constituting the core base material.

[0081] Formation of a surface layer on the surface of nickel hydroxide particles

[0082] Put the above-mentioned high-density nickel hydroxide particles into an alkaline aqueous solution whose pH is controlled by sodium hydroxide to 12±0.2. While stirring this solution, an aqueous solution containi...

Embodiment 6～10

[0118] Table 4 shows the necessary treatment time for alloys obtained in the same manner as alloy 1 of the present invention except that the treatment time was controlled so that the mass saturation magnetization (unit emu / g) was 1.0, 2.5, 4.0, 5.0, 8.0, 9.0, and 10.0. Among them, the alloys whose mass saturation magnetization (unit emu / g) is 1.0, 2.5, 4.0, 5.0, 8.0, and 9.0 are set as the alloy 6 of the present invention, the alloy 7 of the present invention, the alloy 8 of the present invention, the alloy 1 of the present invention, and the alloy of the present invention. Invention Alloy 9 and Invention Alloy 10, the formed batteries are set as Invention Battery 6, Invention Battery 7, Invention Battery 8, Invention Battery 1, Invention Battery 9, and Invention Battery 10. In addition, an alloy with a mass saturation magnetization of 0.5 and an alloy with a mass saturation magnetization of 10.0 that were not treated were set as Comparative Alloy 4 and Comparative Alloy 5, and...

Embodiment 11～13

[0126] The alloy powder obtained in the same manner as in Example 1 was Alloy 11 of the present invention except that 5% of yttrium was added to the Mm (cerium-lanthanum alloy) composition of the hydrogen storage alloy, and it was the same as in Example 1 except that 5% of ytterbium was added. The alloy powder thus obtained is Alloy 12 of the present invention, and the alloy obtained in the same manner as in Example 1 is Alloy 13 of the present invention except that 5% of erbium is added. Battery 12, battery 13 of the present invention. The results are shown in Table 5.

[0127] differentiate

processing time

(h)

Negative board discharge capacitor

Quantity (mAh)

10Ita discharge

Discharge capacity (%)

Cycle times

number (cycle)

Example 1

0

290

80

800

Example 11

5

286

85

1030

Example 12

10

286

81

900

Example 13

20

285

...

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Abstract

By solving the above problems, a closed nickel-hydrogen storage battery (1) excellent in high-rate discharge characteristic and in charging / discharging cycle characteristic is realized. The closed nickel-hydrogen storage battery (1) is characterized in that a nickel-rich layer (11) having a thickness of 50 to 400 nm is formed on each particle of a hydrogen storage alloy powder, the nickel-rich layer (11) is also formed on the surface of a crack (12) continuous with the surface of the alloy particle, the mass saturated magnetization of the alloy powder is preferably 2.5 to 9 emu / g, and the content of magnetic nickel is 0.5 to 1.9 mmol per gram of the hydrogen storage alloy powder. Such a hydrogen storage alloy is subjected to a hydrogen storing step, an alkali treatment step, a product removing step, a hydrogen releasing step, and air partial oxidization step, and thus an alloy powder is produced. Using this alloy powder, a battery having the characteristics mentioned above is manufactured. The invention can be effectively applied to a corrosion-resistant hydrogen storage alloy containing Er, Y, and Yb.

Description

technical field [0001] The invention relates to a nickel-metal hydride storage battery and a manufacturing method thereof, and more particularly relates to the improvement of the high-efficiency discharge characteristics of its negative electrode. Background technique [0002] In recent years, there has been a rapid increase in the number of electric machines that require high-current discharge, represented by electric vehicles and electric tools. As a power source for these devices, a sealed nickel-metal hydride storage battery has higher energy per unit volume and unit mass than nickel-cadmium storage batteries, lead storage batteries, etc., and has recently attracted attention as an environmentally clean power supply. In addition, since the oxygen generated on the positive electrode can be absorbed by the negative electrode containing hydrogen storage alloy during overcharging, the nickel-metal hydride storage battery has the advantages of simple charging control method a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/30H01M4/52C22C19/00
CPCY02E60/124Y02E60/10
Inventor 冈部一弥森启晃古川健吾绵田正治温田敏之
Owner GS YUASA INT LTD
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