JPS60180065A - Air electrode - Google Patents

Abstract

PURPOSE:To improve polarization characteristics by making heat-treated polyacrylonitrile contained in active carbon for an air electrode. CONSTITUTION:An air electrode that makes heat-treated polyacrylonitrile contained in active carbon is used in a button type air battery, fuel cell, etc. For example, this air electrode is obtained by heating the powder of polyacrylonitrile in a nitrogen flow for approximately 10hr at 300-350 deg.C to form black and brown powder and mixing and molding this powder and the active carbon. This air electrode can be manufactured easily and has the excellent performance of polarization characteristics and such.

Description

[Detailed description of the invention] The present invention relates to a button type air battery and an air temperature battery.

The present invention relates to air electrodes used in air dry cells, fuel cells, etc., and more specifically relates to air electrodes having excellent polarization characteristics.

A button-type air battery that has been used for a long time.

Air electrodes used in air temperature batteries, air dry batteries, fuel cells, etc. are mainly made of activated carbon, and if necessary, noble metals such as silver and platinum or metal phthalocyanines such as copper phthalocyanine and iron phthalocyanine are used as catalysts. Because of this, there are disadvantages such as increased costs in the case of precious metals, and in the case of metal phthalocyanines, the expected effects cannot be obtained because only a small amount of metal phthalocyanine can adhere to activated carbon, and the process becomes complicated. had and was.

As a result of extensive research into an air electrode that is cost-effective, easy to manufacture, and has good performance, the inventors of the present invention have discovered that activated carbon contains heat-treated polyacrylonitrile. We succeeded in obtaining an air electrode with excellent polarization characteristics. That is, when polyacrylonitrile is heat-treated, it becomes a nitrogen-containing cyclic polymer as shown in the formula below, which has a dominant ability to decompose hydrogen peroxide. =pq=Sushita 7cho 01 Noah 21 Kuchi Nitokare The air electrode containing the cyclic polymer obtained by this heat treatment is obtained in the following manner.

■ Polyacrylonitrile powder in a nitrogen stream at 300~3
Heating for 50'010 hours gives a dark brown powder. A υ air electrode is obtained by mixing this powder and activated carbon and molding it.

■Polyacrylonitrile powder, activated carbon, artificial graphite, and thermoplastic resin are crushed and mixed in a ball mill, and then a round bar with a diameter of 10φ is made using an extruder. A round bar with 200'
Heating at 1400°C for 2 hours provides an air electrode.

The content of polyacrylonitrile in the air electrode is preferably 1 to 25% by weight; if it is less than 1% by weight, there is no effect, and if it is more than 25% by weight, the strength of the air electrode decreases, making it impractical.

The present invention will be explained in detail below using Examples.
The middle part of the example represents 2 parts by weight.

Example 1 10 parts of Yang shell activated carbon with a particle size of 0.1 to 1 μm, 9 parts with a particle size of 0.1 to 1 μm
10 parts of 0.5μ artificial graphite, 5 parts of thermoplastic resin, and 2 parts of polyacrylonitrile are mixed and ground in a ball mill. Next, it is extruded into a round bar with a diameter of 10IIIll by an extruder. This round bar was heated at 200°C for 1 hour in a nitrogen stream for 40 minutes.
Heate at 0°C for 2 hours to obtain an air electrode.

Comparative Example 1 An air electrode was obtained in the same manner as in Example 1, except that 2 parts of polyacrylonitrile was replaced by the same amount of coconut shell activated carbon.

Example 2 White powder of polyacrylonitrile was heated to 300~
Heating at 350°C for 10 hours yields a dark brown powder. Grind thoroughly with a ball mill.

Next, 2 parts of a cyclic polymer obtained by heat-treating polyacrylonitrile and 8 parts of coconut shell activated carbon were thoroughly mixed to obtain an air electrode for a button-type air cell.

Comparative Example 2 An air electrode for a button-type air battery was obtained in the same manner using 2 parts of iron phthalocyanine instead of 2 parts of the cyclic polymer in Example 2.

FIG. 1 shows the polarization curves of the air electrodes obtained in Example 1 and Comparative Example 1, and FIG. 2 shows the polarization curves of the air electrodes of Example 2 and Comparative Example 2.

As described above, the air electrode of the present invention exhibits excellent polarization characteristics and is suitable for button-type air batteries and air temperature batteries.

It is suitable as an air electrode for air dry batteries and fuel cells.

[Brief explanation of drawings]

FIG. 1 shows Example 1. FIG. 2 shows the polarization curve of the air electrode obtained in Comparative Example 1, and FIG. 2 shows the polarization curve of the air electrode obtained in Comparative Example 1. In the polarization curve of the air electrode obtained in Comparative Example 2, υ, ■ to ■ correspond to Example 1. Comparative example 1. Example 2. The polarization curve obtained in Comparative Example 2 is shown, in which the vertical axis represents current density (mA/cr/I) and the horizontal axis represents potential (v/5cE). Patent applicant: Bentel Co., Ltd.

Claims (1)

[Claims] ゛ An air electrode characterized by containing heat-treated polyacrylic acid.