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Alkaline dry battery

A dry battery and alkaline technology, which is applied in the field of alkaline dry batteries, can solve the problems of reduced negative electrode active material filling, hindered electrode reaction, and reduced negative electrode density, achieving excellent leakage resistance and discharge performance, and the effect of suppressing gas

Inactive Publication Date: 2009-02-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surfactants of the above-mentioned Patent Documents 1 and 2 are strongly adsorbed on the surface of the zinc alloy particles, and the diffusion rate is slow, so there is a problem that the electrode reaction shown in the above-mentioned formula (1) is hindered, so that a sufficient amount cannot be obtained. Excellent high current discharge performance
[0009] In addition, if a surfactant having the property of easily foaming as described in Non-Patent Document 1 is added to the negative electrode, the density of the negative electrode will decrease, and the filling amount of the negative electrode active material will decrease, so there is a problem that the discharge performance will decrease.
However, the closed-circuit voltage of an alkaline dry battery in which a conventional surfactant is added to the negative electrode shows a large drop at the moment when a large load is applied.
For example, the above-mentioned voltage drop is caused by the rush current at startup of this kind of equipment, so the closed-circuit voltage of the battery is often lower than the voltage that can make the equipment work
At this time, there is a problem that even if the alkaline dry battery has a capacity that can be fully used, it cannot obtain a sufficient discharge capacity as a result.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9 and comparative example 1～3

[0129] (1) Fabrication of the battery case

[0130] Prepare a ring-shaped cold-rolled steel sheet with a thickness of 0.4 mm, go through the electroplating process with the conditions shown in Table 1, and use a protective gas composed of 6.5% hydrogen and 93.5% nitrogen at a dew point of -40 ° C, and at 550 ° C Perform an annealing process for 6 hours at the soaking temperature to form nickel-containing layers on both sides of the steel sheet, thereby obtaining a nickel-plated steel sheet.

[0131] Table 1

[0132]

[0133] The above-mentioned nickel-plated steel plate is punched into a circle, and then processed into a cup-shaped intermediate product. Then, the cup-shaped intermediate product is made into a can by the DI method of continuously performing drawing processing by two drawing dies and reducing extrusion processing by three reducing extrusion dies, and the outer diameter is 13.90mm. mm, and the thickness of the side is 0.18mm battery case 1. In the center of...

Embodiment 10～17 and comparative example 4～5

[0167] The compound represented by general formula (2), that is, the phosphoric acid ester represented by following general formula (5) is obtained by esterification reaction of alkyl alcohol and phosphoric acid.

[0168] Formula (5)

[0169]

[0170] At this time, the number of carbon atoms of the alkyl group in the alkyl alcohol and the kind of salt that neutralizes the phosphoric acid group are changed. That is, compounds 12 to 21 were produced by varying m, n, m+n, X, and Y, which are the structural parameters of the general formula (5), as shown in Table 3.

[0171] Compounds 12 to 21 were added to the negative electrode, and AA-shaped alkaline dry batteries were produced in the same manner as in Example 1, and evaluated in the same manner as above. The results of these evaluations are shown in Table 3.

[0172] table 3

[0173]

[0174] In the batteries of Comparative Examples 4 and 5, the number of carbon atoms in the phosphate molecule was increased, which hin...

Embodiment 18～23

[0177] By the alkylation reaction of phosphoric acid ester, the compound represented by General formula (3), ie, the phosphoric acid ester represented by following General formula (6) is obtained.

[0178] Formula (6)

[0179]

[0180] At this time, by changing the number of carbon atoms in the alkyl group and the type of salt that neutralizes the phosphoric acid group, the structural parameters of the general formula (6), namely n, X, and Y, are variously changed as shown in Table 4, and the Compounds 22-27 were obtained.

[0181] Compounds 22 to 27 were added to the negative electrode, and the same method as in Example 1 was used to fabricate single-size alkaline dry batteries, respectively, and evaluated in the same manner as above. These evaluation results are shown in Table 4.

[0182] Table 4

[0183]

[0184]The batteries of Examples 18-23 of the present invention where n=1-6 in the general formula (6) have less voltage drop, exhibit good discharge performance ...

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Abstract

An alkaline dry battery of this invention includes: a positive electrode including at least one of a manganese dioxide powder and a nickel oxyhydroxide powder; a negative electrode including a zinc alloy powder; a separator interposed between the positive electrode and the negative electrode; an alkaline electrolyte; and a battery case for housing the positive electrode, negative electrode, the separator, and the alkaline electrolyte. The negative electrode further includes a surfactant that adsorbs to a surface of the zinc alloy powder during a non-discharge period and promptly desorbs from the surface of the zinc alloy powder upon start of discharge without impeding ion transfer in the alkaline electrolyte.

Description

technical field [0001] The invention relates to an alkaline dry battery, in particular to a negative electrode of the alkaline dry battery. Background technique [0002] Generally speaking, alkaline dry batteries have a structure in which a cylindrical positive electrode containing manganese dioxide powder or nickel oxyhydroxide as a positive electrode active material is placed in a positive electrode case that doubles as a positive electrode terminal in a manner that is closely attached to the positive electrode case. mixture, and then arrange a negative electrode containing zinc alloy powder as a negative electrode active material through a separator in the center. As the negative electrode, a gel-like material obtained by mixing a gelling agent such as sodium polyacrylate with an alkaline electrolyte is generally used. [0003] In order to improve the corrosion resistance of the above-mentioned negative electrode, it has been proposed to add polyoxyethylene alkyl ether p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/06H01M4/42H01M6/06H01M50/119H01M50/124H01M50/133
CPCH01M2/0285H01M6/168H01M6/5088H01M6/06H01M2200/00H01M4/62H01M4/42H01M6/08H01M2/0275Y02E60/124H01M2004/027H01M2/0287H01M4/244H01M4/50H01M6/5072H01M4/52H01M4/06Y02E60/10H01M50/124H01M50/133H01M50/119
Inventor 泉秀胜加藤丞山本贤尔住山真一岩城浩文
Owner PANASONIC CORP
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