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Hydrogen storage alloy powder and nickel hydrogen secondary battery using this hydrogen storage alloy powder

A hydrogen storage alloy, secondary battery technology, applied in secondary batteries, nickel storage batteries, battery electrodes, etc., can solve problems such as large self-discharge and reduced residual capacity, and achieve self-discharge, bad conditions, and operating voltage. the reducing effect of

Active Publication Date: 2017-11-28
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, although a general nickel-metal hydride secondary battery has a high capacity, it has a large self-discharge, so if it is left for a long time, the remaining capacity will decrease, and it often needs to be charged immediately before use.

Method used

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  • Hydrogen storage alloy powder and nickel hydrogen secondary battery using this hydrogen storage alloy powder
  • Hydrogen storage alloy powder and nickel hydrogen secondary battery using this hydrogen storage alloy powder
  • Hydrogen storage alloy powder and nickel hydrogen secondary battery using this hydrogen storage alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Production of positive electrode

[0063] Weigh nickel sulfate, zinc sulfate, magnesium sulfate and cobalt sulfate according to the conditions that zinc is 3% by mass relative to nickel, magnesium is 0.4% by mass relative to nickel, and cobalt is 1% by mass relative to nickel, and they are added to the ammonium ion-containing A mixed aqueous solution was prepared in a 1N aqueous sodium hydroxide solution. While stirring the obtained mixed aqueous solution, slowly add 10N sodium hydroxide aqueous solution to the mixed aqueous solution to make it react. Base particles composed of nickel hydroxide in which zinc, magnesium, and cobalt are solid-dissolved.

[0064] Then, the obtained base particles were poured into an aqueous ammonia solution, and an aqueous cobalt sulfate solution was added to the aqueous solution to cause a reaction. In the reaction here, the pH was maintained at 9-10. Through this reaction, an intermediate particle having a cobalt hydroxide layer w...

Embodiment 2

[0084] In addition to the composition of the hydrogen storage alloy (La 0.25 SM 0.75 ) 0.90 Mg 0.10 Ni 3.25 Al 0.25 Except for this, a nickel-hydrogen secondary battery was produced in the same manner as in Example 1.

Embodiment 3

[0086] In addition to the composition of the hydrogen storage alloy (La 0.25 SM 0.75 ) 0.90 Mg 0.10 Ni 3.25 Al 0.25 . A nickel-metal hydride secondary battery was produced in the same manner as in Example 1, except that it was pulverized under the pulverization condition 2 shown below.

[0087] Here, the pulverization condition 2 will be described. In the pulverization condition 2, first, the ingot of the hydrogen storage alloy is pulverized in the first stage to obtain the first powder. Small particle size particles having a particle size of 45 μm or less were taken out from the obtained first powder, and the small particle size powder composed of the small particle size particles was accommodated and stored in a predetermined container. Then, the second-stage pulverization is performed on the remainder of the first powder to obtain a second powder. Thereafter, the small particle diameter powder taken out in the first stage was added to the second powder to obtain a hy...

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Abstract

This nickel hydrogen secondary battery 2 is provided with: an outer casing can 10; and an electrode group 22 that is contained within the outer casing can 10 together with an alkaline electrolyte solution in a hermetically sealed state. The electrode group 22 is composed of a positive electrode 24 and a negative electrode 26, which are superposed on each other with a separator 28 being interposed therebetween. The negative electrode 26 contains a hydrogen storage alloy powder that is an aggregate of hydrogen storage alloy particles. If M is the average particle diameter of the hydrogen storage alloy particles, P is the particle diameter equal to 1 / 2 of M, and Q is the particle diameter equal to 1 / 3 of M, the content of the particles having particle diameters of P or less is less than 20% by mass of the whole hydrogen storage alloy powder, and the content of the particles having particle diameters of Q or less is less than 10% by mass of the whole hydrogen storage alloy powder.

Description

technical field [0001] The present invention relates to a hydrogen storage alloy powder and a nickel-metal hydride secondary battery using the hydrogen storage alloy powder. Background technique [0002] Nickel-metal hydride secondary batteries have a higher capacity than nickel-cadmium secondary batteries and are also superior in environmental safety. Therefore, nickel-hydrogen secondary batteries are widely used in various applications such as various portable devices and hybrid electric vehicles. [0003] However, a general nickel-metal hydride secondary battery has a high capacity but a large self-discharge. Therefore, if it is left for a long time, the remaining capacity decreases, and it often needs to be charged immediately before use. [0004] Therefore, many studies have been made to improve the self-discharge characteristics of nickel-hydrogen secondary batteries, and various self-discharge-suppressed nickel-hydrogen secondary batteries have been developed (for exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38B22F1/00B22F5/00C22C19/00H01M4/24H01M10/30
CPCY02E60/10C22C2202/04B22F1/052C22C1/0408B22F9/04B22F9/023B22F2999/00C22C19/03H01M4/242H01M4/383H01M4/466H01M10/345H01M2300/0014B22F1/00H01M10/30C22C19/00H01M4/38B22F5/00H01M4/24H01M4/32
Inventor 木原胜佐口明新海裕介石田润甲斐拓也梶原刚史
Owner FDK CORP
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