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Nickel hydrogen secondary battery

A secondary battery, nickel-metal hydride technology, applied in the direction of secondary batteries, nickel storage batteries, battery electrodes, etc., to achieve the effect of suppressing the drop of working voltage, suppressing the drop of working voltage, and suppressing self-discharge

Active Publication Date: 2016-11-16
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in equipment using such a battery pack, it is easy to cause the aforementioned problems

Method used

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  • Nickel hydrogen secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0066] (1) Production of positive electrode

[0067] Weigh nickel sulfate, zinc sulfate, magnesium sulfate, and cobalt sulfate so that the amount of zinc is 3% by mass, magnesium is 0.4% by mass, and cobalt is 1% by mass relative to nickel, and they are added to 1N sodium hydroxide containing ammonium ions In an aqueous solution, a mixed aqueous solution is prepared. While stirring the obtained mixed aqueous solution, slowly add 10N aqueous sodium hydroxide solution to the mixed aqueous solution to make it react. During the reaction at this time, the pH is stabilized at 13 to 14, and nickel hydroxide is produced as the main body. Nickel hydroxide particles in which zinc, magnesium and cobalt are dissolved.

[0068] The obtained nickel hydroxide particles were washed three times with 10 times the amount of pure water, dehydrated and dried.

[0069] Then, mix 10 parts by mass of cobalt hydroxide powder to 100 parts by mass of positive electrode active material powder made of t...

Embodiment 2

[0085] In addition to forming the composition of the hydrogen storage alloy as (La 0.20 SM 0.80 ) 0.97 Mg 0.05 Ni 3.33 al 0.17 Other than that, a nickel-metal hydride secondary battery (battery b) was fabricated in the same manner as battery a of Example 1.

Embodiment 3

[0087] In addition to forming the composition of the hydrogen storage alloy as (La 0.20 SM 0.80 ) 0.97 Mg 0.03 Ni 3.30 al 0.20 Other than that, a nickel-metal hydride secondary battery (battery c) was fabricated in the same manner as battery a of Example 1.

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Abstract

This nickel hydrogen secondary battery (2) is provided with an outer package can (10) and an electrode group (22) that is hermetically sealed within the outer package can (10) together with an alkaline electrolyte solution. The electrode group (22) is composed of a positive electrode (24) and a negative electrode (26), which are laminated with a separator (28) being interposed therebetween. The alkaline electrolyte solution contains NaOH as a main component of the solute. The negative electrode (26) contains a hydrogen storage alloy which has a composition represented by general formula Ln1-xMgxNiy-zMz (wherein Ln represents one or more elements selected from among rare earth elements and Zr; M represents Al; subscripts x, y and z respectively satisfy 0 <= X<= 0.05, 3.3 <= y <= 3.6 and 0 <= z <= 0.50; and the ratio of La among the rare earth elements in Ln is 25% or less).

Description

technical field [0001] The present invention relates to a nickel-metal hydride secondary battery. Background technique [0002] Compared with nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries have higher capacity and are also superior in environmental safety. From this point of view, nickel-hydrogen secondary batteries can be used in various applications such as various portable devices and hybrid electric vehicles. superior. [0003] However, a general nickel-metal hydride secondary battery has a large self-discharge even though it has a high capacity. Therefore, if left for a long time, the remaining capacity decreases, and it is often necessary to charge it immediately before use. [0004] Therefore, many studies have been conducted on improving the self-discharge characteristics of nickel-hydrogen secondary batteries, and various self-discharge-suppressed nickel-hydrogen secondary batteries have been developed (for example, refer to Patent Document...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C22C19/00H01M10/30
CPCC22C28/00C22C30/00H01M4/242H01M10/345H01M4/385C22C19/03Y02E60/10H01M4/383
Inventor 石田润甲斐拓也
Owner FDK CORP
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