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Non-sintered positive electrode and alkaline secondary battery having the same

A secondary battery, non-sintering technology, applied in the manufacture of secondary batteries, alkaline storage batteries, alkaline storage batteries, etc., can solve the problems of reducing active substances, alkaline electrolyte injection, difficulty in ensuring battery capacity, etc., and achieve long life , prolong battery life, inhibit swelling effect

Active Publication Date: 2018-12-18
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the volume inside the battery is fixed, if the amount of alkaline electrolyte injected into the battery increases, the corresponding amount of active material has to be reduced
If the amount of active material, which is a component directly related to battery capacity, decreases, it will be difficult to ensure the required battery capacity
In addition, considering the balance of battery internal pressure and leakage, it is sometimes difficult to inject a large amount of alkaline electrolyte into the battery
[0012] Such an improvement in the life of batteries used for back-up power that must be continuously recharged is not sufficient

Method used

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  • Non-sintered positive electrode and alkaline secondary battery having the same
  • Non-sintered positive electrode and alkaline secondary battery having the same
  • Non-sintered positive electrode and alkaline secondary battery having the same

Examples

Experimental program
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Effect test

Embodiment 1

[0072] (1) Manufacturing of positive electrode

[0073] On the condition that zinc is 3% by mass and cobalt is 1% by mass with respect to nickel, nickel sulfate, zinc sulfate, and cobalt sulfate are weighed and added 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 react. During the reaction, the pH was stabilized at 13-14, and nickel hydroxide was formed as the main component. , Zinc and cobalt are dissolved in the base particles.

[0074] After washing the obtained base particles three times with 10 times the amount of pure water, they are dehydrated and dried. In addition, the obtained base particles had a spherical shape with an average particle diameter of 10 μm.

[0075] Then, the obtained base particles were put into an aqueous ammonia solution, and while maintaining the pH during...

Embodiment 2

[0094] In addition to rolling with the nickel mesh metal loaded on the surface of the positive electrode intermediate product, it is manufactured by vacuum vapor deposition without nickel. There is a surface layer formed of nickel mesh metal on the surface of the positive electrode body 40. In the same manner as in Example 1, except for the positive electrode 24 of 42, a nickel-hydrogen secondary battery 2 in a usable state was produced.

[0095] The flat-mesh metal used in this example has a mesh shape formed by scribing slits on a nickel foil with a purity of 99.5% and then stretching it, and includes a skeleton part of the mesh and formed between the skeleton part The diamond-shaped through hole (opening). Here, as the sheet metal, a sheet metal having a foil thickness of 0.02 mm, an opening long side dimension of 1.0 mm, an opening short side dimension of 0.5 mm, and a frame portion width of 0.08 mm can be used.

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Abstract

The present invention relates to a non-sintered positive electrode for an alkaline secondary battery and an alkaline secondary battery including the non-sintered positive electrode. The non-sintered positive electrode (24) for an alkaline secondary battery includes a positive electrode core member (44), and a positive electrode body (40) packed in the positive electrode mixture (46) of the positive electrode core member (44), and a presence thereof a surface layer (42) on a surface portion (41) of the positive electrode body (40). The positive electrode mixture (46) contains nickel hydroxide as a positive electrode active material and the surface layer (42) contains nickel. The alkaline secondary battery (2) includes a casing (10) and an electrode group (22) housed in the casing (10) together with an alkaline electrolyte. The electrode group (22) includes a positive electrode (24) and a negative electrode (26) that are overlapped via a separator (28), the positive electrode (24) and negative electrode (26) being the non-sintered positive electrode.

Description

Technical field [0001] The present invention relates to a non-sintered positive electrode used in an alkaline secondary battery and an alkaline secondary battery provided with the non-sintered positive electrode. Background technique [0002] As positive electrodes used in alkaline secondary batteries, sintered positive electrodes and non-sintered positive electrodes are known. [0003] The sintered positive electrode can be manufactured in the following manner, for example. [0004] First, a porous nickel sintered substrate is prepared, which is obtained by fixing nickel powder on a positive electrode core material formed of a nickel-plated punched metal plate and sintering it. This porous nickel sintered substrate is immersed in a nickel salt solution such as a nickel nitrate aqueous solution, and then immersed in an alkaline aqueous solution. Through such a process, a sintered positive electrode can be produced by generating nickel hydroxide as a positive electrode active materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/24H01M4/62H01M10/28
CPCH01M4/24H01M4/628H01M10/28H01M4/52H01M4/806H01M4/808H01M10/30H01M4/32H01M10/345H01M2004/028
Inventor 山根哲哉谷本雄哉井本雄三浅沼英之
Owner FDK CORP
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