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Alkaline dry cell

A technology for dry batteries and manganese dry batteries, which is applied in dry batteries, secondary batteries, battery electrodes, etc., can solve the problems of high indium prices, and achieve the effects of preventing cost increases, preventing sharp rises in temperature during short circuits, and reducing costs

Inactive 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

Here, in recent years, the demand for the use of indium as a transparent conductive film for liquid crystal displays has increased, and the price of indium has risen accordingly.

Method used

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Examples

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Embodiment Construction

[0046] An embodiment of the present invention will be described below with reference to the drawings.

[0047] One embodiment of the present invention relates to an alkaline dry battery comprising, as main components, a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator, and an alkaline electrolyte. The positive electrode active material is composed of electrolytic manganese dioxide, electrolytic manganese dioxide and nickel oxyhydroxide, or nickel oxyhydroxide. The negative electrode active material is composed of at least zinc alloy powder containing calcium and bismuth.

[0048] Here, the biggest feature of this embodiment lies in the zinc alloy powder, specifically, its biggest feature is:

[0049] 1) The zinc alloy powder contains 10% by weight to 60% by weight of calcium based on bismuth. That is, the weight ratio Ca / Bi of calcium to bismuth in the zinc alloy powder is 0....

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Abstract

Disclosed is an alkaline dry cell comprising a positive electrode (3) containing a positive electrode active material, a negative electrode (6) containing a negative electrode active material, a separator (4), and an alkaline electrolyte solution. The negative electrode active material contains a zinc alloy powder containing calcium and bismuth. The zinc alloy powder contains not less than 10% by weight but not more than 60% by weight of calcium relative to bismuth, while containing not less than 0.004% by weight but not more than 0.02% by weight of bismuth. The zinc alloy powder contains particles having a particle diameter of not more than 75 [mu]m in an amount of not less than 11% by weight. Consequently, the alkaline dry cell is sufficiently improved in high power pulse discharge performance without having harmful effects such as rapid temperature rise at the time of short circuit of the cell or occurrence of liquid leakage.

Description

technical field [0001] The invention relates to an alkaline dry battery. Background technique [0002] Alkaline manganese dry batteries using manganese dioxide for the positive electrode, zinc for the negative electrode, and alkaline aqueous solution for the electrolyte are widely used as power sources for various devices due to their high versatility and low cost. Furthermore, in recent years, nickel-containing alkaline dry batteries, in which nickel oxyhydroxide is added to the positive electrode to improve output characteristics, have spread rapidly in response to digitalization of equipment. [0003] In alkaline dry batteries, amorphous zinc powder obtained by a gas atomization method or the like is used as the negative electrode active material. Zinc powder is easily corroded in an alkaline electrolytic solution to generate hydrogen gas, which causes an increase in battery internal pressure and liquid leakage. Therefore, the reliability of the alkaline dry battery wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/42C22C18/00C22C18/04H01M4/50H01M4/52H01M4/62H01M6/08
CPCY02E60/124C22C18/00H01M4/244H01M10/283H01M4/42H01M2004/021H01M6/08H01M4/06Y02E60/10
Inventor 加藤文生岛村治成布目润美藤靖彦
Owner PANASONIC CORP
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