Alkali battery

A technology for alkaline batteries and battery casings, applied in the direction of alkaline storage batteries, alkaline storage battery manufacturing, dry batteries, etc., can solve problems such as difficulty in ensuring the superiority of discharge performance, and achieve the suppression of discharge performance decline and the high discharge performance drop Performance, the effect of improving discharge performance

Active Publication Date: 2010-08-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, even if the initial discharge performance can be improved by adding a specified proportion of graphite, as long as electrolytic manganese dioxide with a potential lower than 270mV is used as the positive electrode active material, it is difficult to ensure the superiority of the initial discharge performance.

Method used

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Embodiment Construction

[0033] The inventors of the present application studied factors other than the crystal deformation of manganese dioxide as the reason why the survival rate after storage decreased significantly when high-potential electrolytic manganese dioxide was used, and as a result obtained the following findings.

[0034] That is, the gas in the battery after storage was analyzed, and it was found that most of it was hydrogen gas. This hydrogen gas is considered to be generated by the corrosion of zinc powder in the gelled negative electrode, and it is believed that hydrogen gas is trapped in the closed space formed between the positive and negative electrodes and the gasket in the battery case during storage.

[0035] However, it is generally believed that the deterioration of the storage characteristics of low-potential electrolytic manganese dioxide is due to the oxidation-reduction reaction between manganese dioxide and graphite in the positive electrode mixture, so that the manganese...

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Abstract

The invention relates to an alkali battery. The opening part of a battery case (1) is sealed by a sealing plate (7) with a gasket (5) interposed, and the electrical potential of electrolytic manganese dioxide which is the active material on the positive electrode is in the range of 275-320 mV, and the capacity of a closed space (10) which is formed between the positive electrode (2) and negative electrode (3) inside the battery case (1), on the one hand, and the gasket (5), on the other, is in the range of 2.0-6.0% of the capacity of the battery interior which is formed by the battery case (1) and the sealing plate (7).

Description

technical field [0001] The invention relates to an alkaline battery using electrolytic manganese dioxide as the positive electrode active material. Background technique [0002] Since alkaline batteries have a high energy density per unit weight, they have been widely used as power sources for portable electronic devices that have spread rapidly in recent years. Electrolytic manganese dioxide (EMD) is known as a representative positive electrode active material of alkaline batteries. Generally speaking, electrolytic manganese dioxide contains moisture, ash, and other unavoidable components, and the net (acting as an active material) manganese dioxide (MnO) in electrolytic manganese dioxide 2 ) purity of more than ninety percent. Moreover, in order to improve discharge performance, the technique of raising the potential (typically 270 mV or more) of manganese dioxide is also known (refer patent document 1). [0003] However, it is generally known that when high-potential e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/08H01M2/14H01M4/06H01M4/50H01M50/463H01M50/491
CPCH01M2/0417H01M4/62H01M2/0235H01M2004/027H01M10/283Y02E60/124H01M2004/028H01M4/244H01M4/50H01M2010/4292H01M2004/023H01M10/28H01M2/18H01M2/16Y02E60/10H01M50/182H01M50/154H01M50/463Y02P70/50H01M50/491
Inventor 住山真一小路安彦
Owner PANASONIC CORP
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