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Electrochemical apparatus

An electrochemical and electrolyte technology, applied in circuits, dry batteries, electrical components, etc., can solve the problems of reduced high-rate and low-rate discharge characteristics, reduced leakage resistance, and reduced discharge characteristics.

Active Publication Date: 2011-04-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, hydrogen gas is generated on the surface of the zinc, and the generated hydrogen gas reduces manganese dioxide and nickel oxyhydroxide (positive electrode active material), thereby lowering the battery capacity and causing a reduction in discharge characteristics (i.e., storage characteristics) when the battery is stored for a long period of time after manufacture. , especially high-rate and low-rate discharge characteristics are reduced)
In addition, if the generated gas accumulates, the pressure inside the battery (internal pressure) rises, thereby opening the explosion-proof valve to release the gas to prevent rupture that may cause leakage (decreased anti-leakage characteristics)

Method used

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Examples

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preparation example Construction

[0052] By controlling, for example, the plating step and / or annealing step in the preparation process of the nickel-plated steel sheet and the stretching step and / or thinning step in the manufacturing process of the battery case 8, the thickness of the nickel plating layer can be set within the above range. For example, the original thickness of the nickel coating of the nickel-plated steel sheet is reduced by the stretching step and / or the thinning step, but in order to obtain a nickel-plated steel sheet with a predetermined thickness of the nickel coating, the degree of thickness reduction can be estimated in advance.

[0053] In the manufacturing process of battery case 8, in Figure 4 There is a difference in the degree of stretching of the nickel plating between the first cylindrical side wall 8b and the second cylindrical side wall 8c in the arrow X direction. Therefore, the thickness of the nickel plating layer on the inner surface of the first cylindrical side wall 8b ...

Embodiment 1

[0081] Manganese dioxide powder (HHTF available from Tosho Corporation or NTA grade available from Delta Electrical Industries Co., Ltd.), nickel oxyhydroxide, and graphite powder with an average particle diameter of about 35 μm were mixed in a weight ratio of 50:40:10 to form first mixture. The first mixture and 40% by weight aqueous potassium hydroxide solution were mixed at a weight ratio of 100:1 and stirred well to form a second mixture. The second mixture is shaped into tablets and then crushed into granules. Sieve the particles with a sieve to obtain particles with a size of 10-100 mesh. These particles were molded into hollow cylinders under pressure to obtain positive electrode mixture tablets.

[0082] Nickel oxyhydroxide was prepared by chemical oxidation of nickel hydroxide powder available from Tanaka Chemical Corporation as follows. Nickel hydroxide powder having an average particle diameter of 15 μm was placed in an aqueous sodium hydroxide solution, and then...

Embodiment 2

[0103] This example used a nickel-plated steel sheet having a nickel plating layer of 1.0 μm thick on the surface to be the inner surface of the battery case and a nickel plating layer of 2.5 μm thick on the surface to be the outer surface of the battery case. In addition to changing the thickness of the nickel coating on the inner surface of the battery case as shown in Table 2, the strength ratio I Fe / Ni Using this nickel-plated steel sheet, an alkaline primary battery was produced in the same manner as in Example 1 except for the presence ratio.

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Abstract

For at least inside surface of a battery shell composed of nickel-plated steel, to provide a electrochemistry device such as alkalescence battery having excellent anti-leakage and stored performance through controlling one of the following conditions. The two conditions are: (1) the intensity rate IFe / Ni of Fe and Ni measured by a electron probe microscopic; (2) the proportion of the area which IFe / Ni is above 1.0 and the whole area.

Description

technical field [0001] The present invention relates to electrochemical devices such as alkaline batteries comprising nickel oxyhydroxide, manganese dioxide, or a mixture of nickel oxyhydroxide and manganese dioxide as positive electrode active materials. Background technique [0002] Alkaline batteries are a class of electrochemical devices that include a battery case, a positive electrode mixture (positive electrode), a gelled negative electrode comprising zinc or a zinc alloy, a separator separating the positive and gelled negative electrodes, and an alkaline electrolyte. [0003] Recently, the load on devices powered by alkaline batteries has been increasing. Therefore, an alkaline battery having excellent discharge characteristics is required. One method that has been used to improve battery discharge characteristics is to increase the positive electrode potential by mixing nickel oxyhydroxide into the positive electrode mixture. [0004] The battery case of such alka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/24H01M6/04H01M2/02H01M4/62H01M4/50H01M4/52H01M4/64H01M6/06
CPCY02E60/124Y02E60/10
Inventor 足立光司羽野正敏
Owner PANASONIC CORP