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Alkaline rechargeable battery

A storage battery, alkaline technology, applied in the field of alkaline storage batteries, can solve the problem of difficulty in simultaneously improving self-discharge characteristics of positive active materials, etc., and achieve the effects of improving self-discharge characteristics, improving utilization rate, and improving utilization rate

Active Publication Date: 2013-12-18
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the conventional nickel-metal hydride storage battery has the problem that it is difficult to improve the self-discharge characteristics and the utilization rate of the positive electrode active material at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 1. Manufacturing of batteries

[0074] (1) Production of positive electrode

[0075] Nickel sulfate, zinc sulfate and cobalt sulfate are weighed so that zinc becomes 4% by weight and cobalt becomes 1% by weight for nickel, and they are added to a 1N (normal concentration) sodium hydroxide aqueous solution containing ammonium ions, Adjust the mixed aqueous solution. While stirring the resulting mixed aqueous solution, gradually add 10N (normal concentration) sodium hydroxide aqueous solution to react in this mixed aqueous solution. In the reaction here, the pH is stabilized at 13 to 14, and nickel hydroxide Base particle 38 in which zinc and cobalt are solid-dissolved as a main body.

[0076] The obtained base particles 38 were washed three times with 10 times the amount of pure water, then dehydrated and dried. In addition, the obtained base particles 38 had a spherical shape with an average particle diameter of 10 μm.

[0077] Next, the obtained base particles 38 w...

Embodiment 2、3

[0092] (embodiment 2,3, comparative example 1,2)

[0093] Appropriately change the amount of aluminum hydroxide added in the positive electrode mixture paste. Table 1 represents the weight part of the content of aluminum hydroxide in the positive electrode for 100 parts by weight of the positive electrode active material powder, except that shown in table 1. Except for this value, nickel-metal hydride storage batteries (batteries b, c, i, j) were produced in the same manner as battery a in Example 1.

Embodiment 4、5

[0094] (embodiment 4,5, comparative example 3,4)

[0095] The concentration of the lithium hydroxide aqueous solution sprayed on the intermediate product particles was appropriately changed, and the amount of LiOH contained in the battery was shown in Table 1 (the value obtained as the amount of LiOH per positive electrode unit capacity), except for the amount of LiOH shown in Table 1. The values ​​other than the values ​​were the same as those of battery b in Example 2, and nickel-hydrogen storage batteries (batteries d, e, k, and 1) were obtained.

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Abstract

An alkaline rechargeable battery (2) comprises an electrode assembly (22) formed of a positive electrode (24) and a negative electrode (26) stacked with a separator (28) interposed between and an alkaline electrolyte, wherein the positive electrode (24) holds a positive electrode mixture containing positive-electrode active material particles (36), each comprising of a base particle (38) formed primarily of nickel hydroxide, coated with a conducive layer (40) of a Co compound containing Li, and a positive-electrode additive (50) containing aluminum hydroxide, distributed between the positive-electrode active material particles, where the amount U of the positive-electrode additive (in parts by weight) relative to 100 parts by weight of the positive-electrode active material particles satisfies 0.01 U<1.5, and wherein Li is present within the alkaline rechargeable battery (2), where the total amount of Li present within the alkaline rechargeable battery (2), in terms of weight of LiOH per unit positive-electrode capacitance 1Ah, is between 20 and 30 (mg / Ah).

Description

technical field [0001] The present invention relates to alkaline storage batteries. Background technique [0002] An alkaline storage battery is a storage battery that uses an alkaline electrolyte as an electrolyte. A nickel-hydrogen storage battery is known as one of such alkaline storage batteries. The nickel-metal hydride storage battery has: a positive electrode holding a positive electrode active material formed of nickel hydroxide; and a negative electrode containing a hydrogen storage alloy. Compared with nickel-cadmium storage batteries, such nickel-metal hydride storage batteries have the advantages of larger capacity and better environmental safety, so they can be used in various applications such as various portable devices and hybrid electric vehicles. As described above, nickel-metal hydride storage batteries have been found to have various applications, and therefore it is desired to improve various characteristics. [0003] As one of the properties desired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/30H01M4/62
CPCH01M10/345H01M2004/021H01M2004/028H01M4/383H01M4/62H01M4/626H01M10/30H01M4/366H01M4/32Y02E60/10
Inventor 井本雄三武井雅朗山根哲哉伊藤武高须大
Owner FDK CORP
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