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Alkaline storage battery and method for producing the same

A manufacturing method and storage battery technology, which are applied in the manufacturing of alkaline storage batteries, alkaline storage batteries, electrodes of alkaline storage batteries, etc., can solve problems such as inability to eliminate, and achieve the effects of suppressing manufacturing costs, low cost, and less self-discharge

Inactive Publication Date: 2005-08-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, although improved technologies for separators have been proposed, many problems caused by elements leached from the negative electrode accompanying repeated charge-discharge cycles, such as self-discharge of the battery and formation of dendrites, cannot be eliminated
That is, the phenomenon that the elements leached from the hydrogen storage alloy electrode move to the positive electrode through the separator to promote self-discharge and the phenomenon that the elements leached from the zinc electrode form dendrites still occur, so the effect of the above-mentioned technology has its limitations.

Method used

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  • Alkaline storage battery and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] (i) Preparation of positive electrode

[0083] Nickel carbonyl powder (#255 manufactured by INCO Corporation) was dispersed in an aqueous solution containing 1% by weight of methylcellulose to prepare a slurry having a solid content of 35% by weight. Gained slurry is coated on the surface of metal substrate, so that the weight density of the nickel powder after sintering is 50g / m 2 . The metal substrate is made by electroplating method, with a thickness of 20μm and a weight density of 170g / m 2 nickel foil.

[0084] Next, the nickel foil with the slurry was dried to evaporate water, and then sintered at 950° C. for 15 minutes in a hydrogen-reducing atmosphere containing water vapor. As a result, organic substances contained in the slurry were removed, and a sintered product of nickel foil and nickel powder (hereinafter referred to as nickel sintered substrate) was obtained.

[0085] The resulting nickel sintered substrate was cut into a matrix to make cuts (slits) of...

Embodiment 2

[0115] (i) Production of batteries

[0116] When making the separator layer, use the average particle size (median particle size D 50 ) 0.2μm carbon fluoride (CF 1.0 ) instead of polytetrafluoroethylene, a sealed battery with a nominal capacity of 6000 mAh in the initial state was produced in the same manner as in Example 1.

[0117] The batteries using zinc oxide, iron oxide, magnesium oxide, manganese oxide, aluminum oxide, chromium oxide, vanadium oxide, titanium oxide and cobalt oxide as oxygen-containing metal compounds are respectively referred to as example batteries C-1, C-2, C-3, C-4, C-5, C-6, C-7, C-8 and C-9.

[0118] (ii) Evaluation of batteries

[0119] Next, the same evaluation as in Example 1 was performed using batteries C-1 to C-9. The results are shown in Table 2.

[0120]

Embodiment 3

[0122] (i) Fabrication of separator layer (polymer sheet)

[0123] Add 125 g of potassium hydroxide aqueous solution (alkaline aqueous solution) with a specific gravity of 1.25 g / ml to 10 g of cross-linked potassium polyacrylate (water-absorbent polymer), 0.2 g of carboxymethyl cellulose (binder), 6.75 g of average Particle size (median particle size D 50 ) 0.1μm polytetrafluoroethylene powder (hydrophobic agent) and 0.5g average particle size (median particle size D 50 ) 1 μm predetermined oxide (oxygen-containing metal compound) and mixed to make it gel.

[0124] The obtained gel was impregnated into the polypropylene nonwoven fabric used in Comparative Example 1 and dried. Thus, a polymer sheet having a thickness of 80 µm was obtained.

[0125] The air permeability of the obtained polymer sheet is about 18ml / cm under the condition of a pressure difference of 124Pa 2 ·s.

[0126] (ii) Production of batteries

[0127] A sealed battery having a nominal capacity of 6000 mAh...

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Abstract

An alkaline storage battery includes: a positive electrode containing nickel hydroxide; a negative electrode; a separator layer intervening between the positive electrode and the negative electrode; and an alkaline electrolyte. The separator layer includes a water-absorbing polymer, a water repellent, an alkaline aqueous solution, and a scavenger capable of trapping an element which leaches from the negative electrode into the alkaline aqueous solution. The scavenger comprises an oxygen-containing metal compound. The negative electrode is a hydrogen storage alloy electrode, a cadmium electrode or a zinc electrode. The water-absorbing polymer comprises a cross-linked polymer having at least one kind of monomer unit selected from the group consisting of an acrylate unit and a methacrylate unit.

Description

Background technique [0001] Alkaline storage batteries such as nickel-metal hydride storage batteries, nickel-cadmium storage batteries, and nickel-zinc storage batteries include a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, and an alkaline electrolyte. The positive electrode uses a nickel electrode containing nickel hydroxide, and the negative electrode uses a hydrogen storage alloy electrode, a cadmium electrode, a zinc electrode, and the like. A non-woven fabric made of polyolefin or the like is generally used for the separator, and an aqueous potassium hydroxide solution or the like is used for the alkaline electrolyte (Power Sources 12, Research and Development in Non-mechanical Electrical Power Sources, 1988, p393-410.). [0002] The conventional alkaline storage battery as described above has the following problems. [0003] In the case of a nickel-metal hydride storage battery, when the battery is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/24H01M10/28H01M10/30H01M10/34H01M10/42H01M50/469
CPCH01M10/4235Y02E60/124H01M2/18H01M4/52H01M4/242H01M10/30H01M10/345H01M2/166Y10T29/49115Y02E60/10Y02P70/50H01M50/446H01M50/469
Inventor 岩仓千秋古川直治暖水庆孝和泉阳一
Owner PANASONIC CORP
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