JPS5846579A - Air cell - Google Patents

Abstract

PURPOSE:To improve the work efficiency of manufacture of a battery, and solve the safety and hygienic problem of the manufacture by using as a catalyst for an air electrode, a metal-phthalocyanine derivative which is soluble in water and formed by connecting the benzene rings of a metal phthalocyanine with -CO- or -SO- groups. CONSTITUTION:An air electrode 3 consists of 40pts.wt. pulverized Teflon powder and 60pts.wt. a material, which contains 10% of a cobalt phthalocyanine derivative formed by connecting the outer shell benzene-ring groups of cobalt phthalocyanine with two -CO- groups as indicated in the figure. The above material is prepared by using active carbon with a specific surface area of around 1,000m<2>/g to absorb an aqueous solution of the above derivative, and drying the active carbon impregnated with the solution at 105 deg.C. Since the solubility of the catalyst can be increased by turning a water-insoluble metal phthalocyanine into its water soluble derivative, the labor for the process of making the catalyst to adhere to the active carbon, from the impregnation of the active carbon with the above solution to the drying of the active carbon, can be reduced considerably by using the above solution with high concentraion. As a result, labor and time can be saved. In addition, since water can be used as a solvent instead of an organic solvent, there is no safety and hygienic problems because only water steam scatters from the above solution during the drying.

Description

[Detailed description of the invention] The present invention relates to improvements in air electrodes for air batteries.

The air electrode of conventional air batteries uses catalysts such as metal phthalocyanine to strengthen the oxygen reduction ability of activated carbon, etc. However, since metal 7-thalocyanine is insoluble in water, it cannot be saturated with organic solvents such as quinoline until it becomes saturated. Hakurinshi 1 Activated carbon is immersed in this solution, pulled up and dried to scatter the organic solvent and deposit the catalyst on the surface of the activated carbon. However, since the amount of saturated dissolution was small, this operation was repeated as many times as necessary, and about 10 tatami weight of catalyst was precipitated and co-existed on the activated carbon.

However, metal phthalocyanine, which is a catalyst for conventional air batteries, is used as a general VcIIs material, and is insoluble in most liquids, including quinoline, NN-dimethylformamide, α-chlornaphthalene, etc. It dissolves only in a limited number of organic solvents, and in addition, the amount of saturated dissolution is very small, and it dissolves only 1 to 2 pounds by weight in the solvent. In order to do this, the operations from impregnating the solution to scattering and drying the solvent had to be repeated about 1 time, which required a large number of laborious and time-consuming operations.
For example, quinoline has a boiling point of 238°C, NN-dimethylformamide has a boiling point of 153°C, α-chlornaphthalene has a boiling point of 263°C, and expensive equipment is required for drying. In addition, the vapor of the organic solvent that has been evaporated and scattered has disadvantages such as being unfavorable to the human body in terms of safety and health.

In the present invention, the benzene ring of metal phthalocyanine is used as the catalyst of the air electrode in -C〇- or -8O! The purpose of this invention is to use a compound having a structure linked by - to make it soluble in water, thereby improving the amount of work in battery manufacturing and solving health and safety problems.

An embodiment of the present invention will be explained based on FIG.

1 is a positive electrode can that also serves as a positive terminal, and has an air supply hole 2 at the bottom. 3 is an air electrode which is in contact with a lyophilic semipermeable membrane 4. Reference numeral 5 denotes an electrolyte holding layer holding a caustic alkaline electrolyte, which is a nonwoven fabric or porous material with excellent liquid retention and liquid resistance, and is in contact with the negative electrode 6 . Reference numeral 7 is paper with good air permeability, which is in contact with the air electrode through a Teflon sheet 8 having many micropores, and the other side of the air electrode 3 is the bottom of the positive electrode can l where the air supply hole 2 is provided. is in contact with 9 is the negative electrode can and gasket) 1
The battery is sealed by bending the opening of the positive electrode can 1 through the 0.

Air electrode 3#'i, surface area approximately 1 t) 00 m'/,
As shown in Fig. 2, the outer shell group of the benzene ring of cobalt phthalocyanine in an amount of 1 OIL was adsorbed onto activated carbon having 9 as a catalyst from an aqueous solution of a derivative linked by two K'', -CO- atoms, and dried at 105°C. 60 parts by weight of Teflon fine powder and 40 parts by weight of Teflon fine powder.

The gold-phthalocyanine derivative of the catalyst of the present invention is 182
1)! The metal phthalocyanine, which was linked to the 46th position of the outer shell of 1 phthalocyanine with 100- or 18O- as shown in u), was completely insoluble in water,
Because it becomes water-soluble by linking with skeleton atoms, it is now possible to impregnate the catalyst with an aqueous solution.Although the catalyst of the present invention is water-soluble, it does not cause electrolysis when it comes into contact with the battery electrolyte. Since the S degree of salt such as caustic potassium in the solution is very high, it hardly dissolves in the electrolytic solution and acts effectively as a catalyst for the air electrode 3 for a long period of time.

In the present invention, the catalyst, Kanasu phthalocyanine, which is insoluble in water, is resistant to dissolution in water and the amount of dissolution can be increased. The amount of adhesion operations can be greatly reduced, resulting in improvements in labor and time. Furthermore, since water can be used as a solvent without using an organic solvent, only water vapor is scattered during drying, eliminating any health and safety problems.

In addition, a catalyst of the present invention of a gold steel phthalocyanine flange conductor in which outer shell benzene rings are connected with -CO- or -5O1- is attached to form a nine-air #! Heat treatment in the temperature range of 350℃ to 8t)O"O in an inert gas atmosphere such as 13Fi, nitrogen, or argon improves the animal storage performance of the battery. Figure 3 shows that heat treatment at 500℃ for 10 minutes Heat-treated air electrode (1
] and the air electrode port which is not subjected to heat treatment] at 20℃ 10mA
A comparative diagram of discharge curves at a constant current of /d is returned. When this catalyst is heat-treated, it can be seen that the weight decreases because either the 7-thalyanine sublimes as it is, or some of the phthalocyanine decomposes or scatters. This is because when metal phthalocyanine is heated, its high co-at ratio increases and becomes stable over a long period of time.
As described above, the water-soluble metal phthalocyanine derivative linked with benzene@t-co- or 18O- is used as an air electrode catalyst. The air 'wt' pond used in this paper improves the production capacity of batteries and solves health and safety problems, and has great industrial value.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the air battery according to the present invention, Figure 2 is a structural diagram of a metal phthalocyanine derivative in which habenzene lI is linked with -CO- (Me = metal>, Figure 83 is a heat-treated air electrode [i]) It is a comparison diagram of the discharge curve of a single electrode with respect to the mercury oxide standard electrode with the air electrode [1]. 1. Positive electrode can 2. Air supply hole 3. Name of the air electrode patent applicant

Claims (3)

[Claims] (1) Benzene m of gold-7 talocyanine is -co-
An air battery using a metal phthalocyanine derivative with a structure in which 4 degrees are connected by -80, - as a catalyst in the air electrode. (2) The air cell according to claim 1, characterized in that the central element of the metal phthalocyanine of the cough catalyst is a transition metal element such as iron, nickel, aluminum, steel, manganese, etc. (3) Claim 1, characterized in that the cough catalyst is heat-treated in a temperature range of 350°C to soo'o.
The air battery according to item 24 or item 24.