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Alkaline battery

An alkaline battery and alkaline technology, applied in dry batteries, battery electrodes, active material electrodes, etc., can solve the problems of poor discharge characteristics under heavy load, large self-discharge, and poor storage performance

Inactive Publication Date: 2001-11-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The proposed alkaline battery comprising manganese dioxide and nickel oxyhydroxide as the anode active material exhibits poor storage performance, especially greater self-discharge when stored at high temperature, compared to conventional alkaline dry batteries without nickel oxyhydroxide
After long-term storage, the proposed alkaline battery containing nickel oxyhydroxide has poorer high-load discharge characteristics than alkaline dry batteries without nickel oxyhydroxide

Method used

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  • Alkaline battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Manganese dioxide, nickel oxyhydroxide and graphite were mixed in a weight ratio of 50:50:5, and then an oxygen-containing zinc compound corresponding to 5 mol% of nickel oxyhydroxide was added. After mixing 1 part (by weight) of electrolyte solution with 100 parts (by weight) of active materials (manganese dioxide and nickel oxyhydroxide), the obtained mixture was uniformly stirred, mixed with a mixer, and granulated to form a certain particle size. The formed particles are shaped under pressure into the form of a hollow cylinder, forming the anode mix "a". A 40% by weight potassium hydroxide aqueous solution was used as the electrolytic solution.

[0029] Anode mix "b" was also made by substituting zinc hydroxide for zinc oxide.

[0030] figure 1 Alkaline cells A and B, shown in LR6 size, were assembled using the prepared anode mixes "a" and "b", respectively. After storage at 60° C. for 7 days, the amount of gas generated in the alkaline battery was measured. Alk...

Embodiment 2

[0032] In the same manner as in Example 1, anode mixtures "c" and "d" were prepared except that calcium oxide and calcium hydroxide were used instead of zinc oxide and zinc hydroxide, respectively. Alkaline batteries C and D were assembled using anode mixtures "c" and "d", respectively, and the gas generation and discharge duration of each alkaline battery were measured.

Embodiment 3

[0034] In the same manner as in Example 1, anode mixtures "e" and "f" were prepared except that yttrium oxide and yttrium hydroxide were used instead of zinc oxide and zinc hydroxide, respectively. Alkaline batteries E and F were assembled using anode mixtures "e" and "f", respectively, and the gas generation and discharge duration of each alkaline battery were measured.

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Abstract

The present invention provides an alkaline battery having good heavy-loading discharge characteristics even after long-term storage at high temperatures. The alkaline battery of the present invention comprises a positive electrode containing manganese dioxide and nickel oxyhydroxide as an active material, a negative electrode containing zinc as an active material, and an alkaline electrolyte. The positive electrode further contains at least one compound selected from the group consisting of an oxygen-containing zinc compound, an oxygen-containing calcium compound, an oxygen-containing yttrium compound, and an oxygen-containing titanium compound.

Description

technical field [0001] This invention relates to improved alkaline cells utilizing manganese dioxide and nickel oxyhydroxide as the anode active materials. technical background [0002] Alkaline batteries such as alkaline dry batteries have a structure in which a cylindrical anode is tightly packed into an anode casing which also functions as an anode terminal, and a gel cathode is arranged at the center of the cylindrical anode by a separator. [0003] Appliances using these batteries have increased loads, and therefore, batteries having excellent large-load discharge characteristics are required. [0004] One technique proposed is to mix nickel oxyhydroxide and an anode material mixture constituting the anode to provide a battery having excellent large-load discharge characteristics (for example, Japanese Laid-Open Patent Publication Sho 57-7226m6). [0005] The proposed alkaline battery containing manganese dioxide and nickel oxyhydroxide as the anode active material has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M4/12H01M4/36H01M4/48H01M4/50H01M4/52H01M6/08
CPCY02E60/12H01M4/06H01M4/50H01M4/52H01M4/12H01M6/08H01M4/364H01M2004/023H01M4/48H01M4/505H01M4/42
Inventor 野矢重人住山真一保科康子藤原教子元谷祐司
Owner PANASONIC CORP
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