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Negative electrode for nickel hydrogen secondary battery, and nickel hydrogen secondary battery including the negative electrode

A technology of secondary battery and negative electrode, applied in the direction of nickel battery, battery electrode, alkaline battery electrode, etc., can solve the problems of rising internal pressure of battery, failure of oxygen absorption reaction to proceed smoothly, and insufficient oxygen absorption.

Active Publication Date: 2019-05-17
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the oxygen absorption reaction in the negative electrode proceeds at a three-phase interface where there are solid phase, gas phase, and liquid phase. However, if a large amount of electrolyte is kept in the negative electrode, a good three-phase interface cannot be formed, and the oxygen absorption reaction cannot be smooth. is carried out, so oxygen cannot be absorbed sufficiently, so the internal pressure of the battery rises
As a result, the safety valve of the battery operates to discharge the electrolyte solution to the outside, causing the problem that the life of the battery ends prematurely.
[0013] In addition, if a large amount of electrolyte solution is kept in the negative electrode, the reaction between the hydrogen storage alloy and the electrolyte solution progresses further, and the electrolyte solution is consumed. As a result, the electrolyte solution is insufficient, and the life of the battery is prematurely ended.

Method used

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  • Negative electrode for nickel hydrogen secondary battery, and nickel hydrogen secondary battery including the negative electrode
  • Negative electrode for nickel hydrogen secondary battery, and nickel hydrogen secondary battery including the negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0069] (1) Manufacturing of positive electrode

[0070] Nickel sulfate, zinc sulfate, and cobalt sulfate were weighed under the conditions that zinc reached 2.5% by mass and cobalt reached 1.0% by mass relative to nickel, and added them to a 1N sodium hydroxide aqueous solution containing ammonium ions to prepare a mixed aqueous solution. While stirring the resulting mixed aqueous solution, a 10N sodium hydroxide aqueous solution was slowly added to the mixed aqueous solution to make it react, and the pH during the reaction was stabilized at 13-14, and a solid nickel hydroxide was produced. Matrix particles in which zinc and cobalt are dissolved.

[0071] After the obtained base particles were washed three times with a 10-fold amount of pure water, dehydration and drying were performed. The result of measuring the particle size of the prepared base particles by a laser diffraction scattering particle size distribution measuring device is that the average particle size of the base ...

Embodiment 2

[0095] In addition to setting the composition of the hydrogen storage alloy to La 0.194 Sm 0.776 Mg 0.03 Ni 3.30 Al 0.2 Except this, in the same manner as in Example 1, a nickel-hydrogen secondary battery was produced. The density of the hydrogen storage alloy of Example 2 is 8.6g / cm 3 , The crystalline structure of the hydrogen storage alloy of Example 2 is A 2 B 7 type.

Embodiment 3

[0097] In addition to setting the mass of solid content per side of the PFA dispersion to 0.3 mg / cm 2 Except for coating the PFA dispersion on both sides of the intermediate product of the negative electrode, a nickel-hydrogen secondary battery was produced in the same manner as in Example 1. The density of the hydrogen storage alloy of Example 3 is 8.6g / cm 3 , The crystalline structure of the hydrogen storage alloy of Example 3 is A 2 B 7 type.

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Abstract

The nickel hydrogen secondary battery (2) has an electrode group (22) including a separator (28), a positive electrode (24) and a negative electrode (26), wherein the negative electrode (26) has a negative electrode core, and a negative electrode mixture held on the negative electrode core, wherein the negative electrode mixture contains a hydrogen absorbing alloy and a water repellent, wherein the hydrogen absorbing alloy has a composition represented by the general formula: Ln 1-x Mg x Ni y-a-b Al a M b (wherein Ln represents at least one element selected from rare earth elements, Ti and Zr;M represents at least one element selected from V, Nb, Ta, and the like; and the subscripts a, b, x and y satisfy relations represented by 0.05 <= a <= 0.30, 0 <= b <= 0.50, 0 <= x < 0.05 and 2.8 <=y <= 3.9, respectively), and has a structure of an A 2 B 7 type; and the water repellent comprises a perfluoroalkoxyalkane.

Description

Technical field [0001] The present invention relates to a negative electrode for a nickel-hydrogen secondary battery and a nickel-hydrogen secondary battery including the negative electrode. Background technique [0002] As a kind of alkaline secondary batteries, nickel-hydrogen secondary batteries are well known. From the viewpoint that the nickel-hydrogen secondary battery has a higher capacity and excellent environmental safety than the nickel-cadmium secondary battery, the nickel-hydrogen secondary battery is used in various portable devices and hybrid electric vehicles. On the device. In such nickel-metal hydride secondary batteries, their applications are expanding day by day, and they can also be used for backup power supplies. [0003] Regarding the backup power supply, although it is used in an emergency period, the life span is insufficient during the emergency period, so it cannot function. For this reason, it is desired that the backup power source has a long life. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/32H01M10/30
CPCC22C19/03C22C30/00H01M4/242H01M4/385H01M4/62H01M4/623H01M2220/10H01M4/383H01M2300/0014H01M10/30Y02E60/10H01M4/24H01M2004/027H01M4/628
Inventor 佐口明石田润大畠昇太
Owner FDK CORP
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