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Alkaline primary battery

An alkaline and battery technology, applied in primary batteries, primary battery electrodes, dry batteries, etc., can solve problems such as high residual zinc content and difficulty in alkaline electrolyte leakage, so as to reduce residual zinc content, ensure discharge performance, and inhibit The effect of leakage

Active Publication Date: 2013-01-02
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the electric capacity of the negative electrode is set larger than that of the positive electrode, the amount of residual zinc after the predetermined electric capacity of the battery is exhausted becomes extremely large.
Therefore, when entering the overdischarge state, a large amount of gas is generated in the battery, and it becomes difficult to suppress the leakage of the alkaline electrolyte.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Follow the steps (1)~(3) below to make figure 1 Alkaline dry batteries A1~A10 (LR6) of size 5 shown in . Using the obtained alkaline dry battery, the influence of the electric capacity ratio C2 / Cl concerning the leakage during overdischarge was investigated.

[0097] (1) Production of positive electrode

[0098] Graphite powder (average particle diameter (D50) 8 μm) as a conductive agent was added to electrolytic manganese dioxide powder (average particle diameter (D50) 35 μm) as a positive electrode active material to obtain a mixture. The mass ratio of electrolytic manganese dioxide powder and graphite powder is 92.4:7.6. Also, the specific surface area of ​​the electrolytic manganese dioxide powder used is 41m 2 / g of powder. The electrolyte solution is added to the mixture, and after being fully stirred, it is compression-molded into chips to obtain a positive electrode mixture. The mass ratio of mixture and electrolyte is 100:1.5. As the electrolytic solution...

Embodiment 2

[0127] In this example, the capacitance ratio C2 / Cl was set to a constant value, and the influence of the height ratio L2 / L1 on the liquid leakage during overdischarge was investigated.

[0128] Alkaline dry batteries V1 to Z10 were produced in the same manner as in Example 1, except that the size of the positive electrode and the negative electrode, the mass of the active material, and the mass ratio of the negative electrode active material and the electrolyte were changed as shown in Tables 2 to 6.

[0129] Using the obtained alkaline dry battery, the electric capacity ratio C2 / Cl and the height ratio L2 / L1 were calculated in the same manner as in Example 1, and the overdischarge tests A and B were evaluated.

[0130] The size, mass, and electrical capacity of the positive and negative electrodes are shown in Tables 2 to 6 together with the above-mentioned evaluation results. In these tables, the values ​​of the electric capacity ratio C2 / Cl and the height ratio L2 / L1 are a...

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Abstract

An alkaline primary battery which comprises: a bottomed cylindrical battery case; a hollow cylindrical positive electrode that is arranged in contact with the inner wall of the battery case and contains manganese dioxide; a gel negative electrode that is arranged within the hollow part of the positive electrode and contains zinc or a zinc alloy; a separator that is arranged between the positive electrode and the negative electrode; and an alkaline electrolyte solution. When the positive electrode has an electrical capacity (C1) and a height (L1) and the negative electrode has an electrical capacity (C2) and a height (L2), the electrical capacity (C1) and the electrical capacity (C2) satisfy the following relational expression (1): 1.05 = C2 / C1 = 1.25, and the height (L1) and the height (L2) satisfy the following relational expression (2): 0.85 = L2 / L1 = f(C2 / C1), provided that f(C2 / C1) = -0.3058 C2 / C1 + 1.3153.

Description

technical field [0001] The present invention relates to an alkaline primary battery, and in more detail relates to the improvement of the positive electrode and the negative electrode of the alkaline primary battery. Background technique [0002] Historically, alkaline primary batteries have been used in a wide variety of devices. In recent years, as the load on equipment using alkaline primary batteries has increased, there has been a demand for batteries with excellent discharge characteristics under heavy loads. [0003] Alkaline primary batteries have a problem in that a high-resistance film containing zinc oxide is formed on the surface of zinc as a negative electrode active material by a discharge reaction, and the internal zinc cannot be effectively used in the discharge reaction. Therefore, unreacted zinc (hereinafter referred to as residual zinc) remains even after the predetermined electrical capacity is exhausted and the device is not operated. [0004] The resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/08H01M2/18H01M4/06H01M4/50
CPCY02E60/12H01M4/06H01M4/50H01M6/085
Inventor 宇塚俊介住山真一小路安彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD