Unlock instant, AI-driven research and patent intelligence for your innovation.

Alkaline dry battery

A dry battery, alkaline technology, applied in the field of alkaline dry batteries, can solve the problems of easy reduction of zinc utilization rate, low ion conductivity, electrical connection and contact degree (insufficient conductive network, etc.), and achieve the effect of excellent discharge characteristics

Inactive Publication Date: 2011-10-05
PANASONIC CORP
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the negative electrode using zinc gel, the electrical connection and contact degree (conductive network) between zinc powders are insufficient, and the ionic conductivity of the gel-like alkaline electrolyte is also low.
Therefore, in the negative electrode using zinc gel, the utilization rate of zinc at the time of high-rate discharge tends to decrease.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alkaline dry battery
  • Alkaline dry battery
  • Alkaline dry battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] The alkaline dry battery of Embodiment 1 has the following configuration: a hollow cylindrical positive electrode is accommodated in a bottomed cylindrical battery case, a negative electrode is arranged in the hollow part of the positive electrode, and a separator is arranged between the positive electrode and the negative electrode. , and an alkaline electrolyte, the negative electrode contains a zinc porous body, and the alkaline electrolyte contains a surface active substance with an average molecular weight of 120 to 350 relative to the zinc mass in the negative electrode, which is 0.1% by mass to 2% by mass. agent, the MnO contained in the positive electrode 2 The theoretical capacity of Zn is 308 mAh / g, and the theoretical capacity of Zn contained in the negative electrode is 820 mAh / g, and the negative electrode / positive electrode capacity balance is 0.9 or more and 1.1 or less. Examples of zinc porous bodies include porous bodies formed of strips, foamed porous ...

Embodiment 1

[0057] -Production of positive electrode-

[0058] The positive electrode was produced as follows. Electrolytic manganese dioxide and graphite are mixed in a ratio of 94:6 by weight, and after 100 parts by weight of the mixed powder is mixed with 1 part by weight of the electrolytic solution (39% by weight of potassium hydroxide aqueous solution containing 2% by weight of ZnO), Stir and mix evenly with a mixer, and adjust to a certain particle size. Then, the obtained granules were press-molded using a hollow cylindrical mold to prepare positive electrode mixture pellets. Here, HH-TF manufactured by Tosoh Co., Ltd. was used for electrolytic manganese dioxide, and SP-20 manufactured by Nippon Graphite Industry Co., Ltd. was used for graphite.

[0059] -How to make the negative electrode-

[0060] Zinc fibers obtained by a melt spinning method (average diameter: 100 μm, average length: 20 mm, manufactured by Akao Aluminum Co., Ltd.) were compressed by a flat press to obtain a...

Embodiment 2

[0082] (Example 2, Comparative Example 3)

[0083] Dry batteries of Example 2 and Comparative Example 3 were produced in the same manner as in Example 1, except that the amount of isopropyl phosphate (surfactant) added to the alkaline electrolyte solution of Example 1 was changed. The evaluation results of the discharge characteristics of the dry batteries B2 to B6 of Example 2 and the dry batteries B1 and B7 of Comparative Example 3 are shown in Figure 4 .

[0084] The dry battery B1 with a small amount of surfactant added had substantially similar discharge characteristics to the dry battery Y of Comparative Example 1, and the medium-rate and low-rate characteristics were not improved. The dry battery B7 in which the added amount of the surfactant was too large had almost the same discharge characteristics as the dry battery Z of Comparative Example 2, and no improvement in the discharge characteristics was observed. In contrast, the high-rate discharge characteristics of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
crystal sizeaaaaaaaaaa
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

An alkaline dry battery having not only excellent high-rate discharge characteristics but also excellent middle-rate and low-rate discharge characteristics. The alkaline dry battery comprises a bottomed cylindrical battery case (8) which houses a hollow cylindrical positive electrode (2), a negative electrode (3) arranged in the hollow space of the positive electrode (2), a separator (4) arranged between the positive electrode (2) and the negative electrode (3), and an alkaline electrolyte solution. The negative electrode (3) contains a zinc porous body, and the alkaline electrolyte solution contains a surfactant having an average molecular weight of not less than 120 but not more than 350 in an amount of not less than 0.1% by mass but not more than 2% by mass relative to the mass of zinc contained in the negative electrode (3). The capacity balance between the negative electrode and the positive electrode (capacity of negative electrode / capacity of positive electrode) as calculated by assuming the theoretical capacity of MnO2 contained in the positive electrode (2) is 308 mAh / g and the theoretical capacity of Zn contained in the negative electrode (3) is 820 mAh / g is not less than 0.9 but not more than 1.1.

Description

technical field [0001] The present invention relates to alkaline dry batteries. Background technique [0002] Alkaline dry batteries (alkaline manganese dry batteries) using manganese dioxide as a positive electrode, zinc as a negative electrode, and an alkaline aqueous solution as an electrolyte are widely used as power sources for various devices because of their high versatility and low cost. [0003] Among commercially available alkaline dry batteries, there is an alkaline dry battery using zinc gel, which is a gel-like alkaline electrolyte in which a gel component (polyacrylic acid, etc.) is dissolved, as a negative electrode. And get. In the negative electrode using zinc gel, the electrical connection and contact degree (conductive network) between zinc powders are insufficient, and the ionic conductivity of the gel-like alkaline electrolyte is also low. Therefore, in a negative electrode using zinc gel, the utilization rate of zinc during high-rate discharge tends t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/08H01M2/26H01M4/06
CPCH01M6/045H01M2004/021H01M10/4235H01M2/0235H01M4/12H01M4/50Y02E60/12H01M2300/0014H01M6/08H01M4/42H01M50/182Y02E60/10
Inventor 加藤文生布目润岛村治成
Owner PANASONIC CORP