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Alkali battery

An alkaline battery, alkaline technology, applied in the direction of alkaline battery electrodes, dry batteries, secondary batteries, etc., can solve the problem of cycle life, not put into practical use and other problems

Inactive Publication Date: 2007-05-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an alkaline storage battery has problems in its cycle life, etc., and has not been put into practical use

Method used

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  • Alkali battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of source material nickel hydroxide

[0055] Pure water and a small amount of hydrazine (reducing agent) were poured into a reaction vessel equipped with a stirring blade, followed by operating the stirring blade. While bubbling with nitrogen gas, use a pump to disperse nickel (II) sulfate aqueous solution, manganese (II) sulfate aqueous solution, sodium hydroxide aqueous solution, and ammonia water with predetermined concentrations into the water being stirred in the container so that the solution in the container Has a constant pH of 12.5 and a constant temperature of 50°C. During this operation, the solution in the vessel was kept sufficiently stirred, so that spherical nickel hydroxide, which is a solid solution including manganese dissolved therein and containing β-type structure crystals, was precipitated and grown.

[0056] Subsequently, the obtained solid solution nickel hydroxide was heated in an aqueous sodium hydroxide solution different from the...

Embodiment 2

[0117] In order to reveal the optimum content of expanded graphite included in the positive electrode material mixture, the following evaluation was performed using expanded graphite f.

[0118] Positive electrode material mixture powders X1, X2, X3, X4, X5 and X6 are obtained in the following manner: mix electrolytic manganese dioxide and nickel oxyhydroxide P in a weight ratio of 50:50, and add 5 wt% of nickel oxyhydroxide P to it The amount of zinc oxide is further added, and graphite f is further mixed therein, so that the content of graphite f in the total amount of nickel oxyhydroxide P, electrolytic manganese dioxide, and graphite f is 0.5wt%, 1wt%, 3wt%, 5wt%, respectively %, 8wt% and 15wt%.

[0119] AA-sized nickel-manganese batteries X1 to X6 were produced in the same manner as in Example 1, except that the above-mentioned positive electrode material mixture powders X1 to X6 were used respectively, and the and .

[0120] For each characteristic, the results obtaine...

Embodiment 3

[0124] In order to obtain findings regarding the attachment of cobalt oxide to the surface of the nickel oxyhydroxide particles, the following evaluations were performed.

[0125] Preparation of nickel hydroxide supported on cobalt hydroxide

[0126] With the same nickel hydroxide (composition: Ni hydroxide) with the source material nickel hydroxide prepared in embodiment 1 0.95 mn 0.05 (OH) 2 ) was introduced into the cobalt sulfate aqueous solution in the reaction vessel, an aqueous sodium hydroxide solution was gradually added thereto, and stirring was continuously performed in the vessel while controlling the solution in the vessel so as to have a constant temperature of 35° C. and a constant pH of 10. As a result, cobalt hydroxide was precipitated on the surface of the source material nickel hydroxide particles. The amount of cobalt hydroxide precipitated on the surface of the nickel hydroxide particles was adjusted to 2% by weight relative to the amount of the source ...

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Abstract

An alkali battery comprising a positive electrode, a negative electrode and an alkali electrolyte, wherein the positive electrode contains a positive electrode mixture containing nickel oxyhydroxide, electrolytic manganese dioxide and expanded graphite, this expanded graphite having an average particle diameter on volume basis of 5 to 25 m, a BET specific surface area of 4 to 10 m2 / g and a bulk specific gravity (apparent density), measured by the still standing method, of 0.03 to 0.10 g / cm3, the nickel oxyhydroxide exhibiting an average nickel valence of = 3.05, the content of the expanded graphite being in the range of 3 to 15 wt.% based on the total amount of the nickel oxyhydroxide, electrolytic manganese dioxide and expanded graphite contained in the positive electrode mixture.

Description

technical field [0001] The present invention relates to alkaline batteries comprising manganese dioxide and nickel oxyhydroxide as active materials in a positive electrode material mixture, and more particularly to nickel-manganese batteries as primary batteries. Background technique [0002] Alkaline batteries as primary batteries, represented by alkaline manganese dry batteries, have an inverted structure including: a positive electrode casing that doubles as a positive electrode terminal; a cylindrical positive electrode material mixture sheet that contains manganese dioxide and is placed on the positive electrode inside the casing and in close contact with the positive electrode casing; and a gel-like zinc negative electrode, the zinc negative electrode is placed in the hollow part of the positive electrode material mixture sheet and a separator is inserted between the mixture sheet and the negative electrode. Generally, the positive electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/08H01M4/06H01M4/52H01M4/62
CPCC01P2006/40C01G53/00Y02E60/124C01P2006/12H01M4/50H01M4/625H01M4/52H01M4/26H01M2010/4292C01P2006/10C01P2002/52C01P2002/78H01M2004/021Y02E60/10
Inventor 加藤文生泽田胜也向井保雄野矢重人
Owner PANASONIC CORP
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