JPS63248071A - Zinc-manganese battery - Google Patents

Abstract

PURPOSE:To eliminate metal corrosiveness and skin irritativeness of electrolyte to prevent handling trouble caused by electrolyte leakage by using an electrolyte containing one or more kinds of a specific imidazol having non-substituted first position as an essential composition. CONSTITUTION:When imidazol having non-substituted first position indicated in the formula is used as an electrolyte, electromotive force is produced between a zinc anode and a manganese dioxide cathode. In the formula, R2 shows hydrogen atom or alkyl group, and R4 shows hydrogen atom or methyl group. A typical imidazol having non-substituted first position is imidazol or 2-methyl imidazol. Each of these compounds or a mixture of these compounds is dissolved in water or kneaded with water soluble paste-forming material and water in a paste state to produce the electrolyte. Since the imidazol compound which is an essential composition of the electrolyte has extremely low metal crrosiveness and skin irritativeness, handling trouble caused by electrolyte leakage is prevented and a battery can safely be handled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention aims to provide a novel zinc-manganese battery.

BACKGROUND OF THE INVENTION Two types of existing zinc-manganese batteries are known: manganese dry batteries and alkaline manganese batteries.

The former uses ammonium chloride and zinc chloride as electrolytes, and the latter uses caustic potassium and zinc oxide. (Edited by the Electrochemistry Association: Electrochemistry for Young Engineers: Published by Maruzen Co., Ltd. in 1981) Problems that the invention aims to solve Ammonium chloride and zinc chloride, which are electrolytes in zinc-manganese dry batteries, have a g1 corrosivity to metals. Because of this, problems such as liquid leakage are likely to occur.

Furthermore, since caustic potash, which is the electrolyte of alkaline manganese batteries, has the property of corrosive to the skin, handling problems are likely to occur when the battery leaks.

Means for Solving the Problems As a result of extensive research, the present inventor discovered that when an unsubstituted imidazole at the 1-position of the general formula shown by the following general formula is used as an electrolyte, an electromotive force is generated between the zinc cathode and the manganese dioxide anode. was discovered and thereby achieved the intended purpose.

The zinc-manganese battery of the present invention has a thickness of, for example, 0°351
11111 zinc plate with an outer diameter of about 30 mm and a length of about 100 m.
Make a cylinder of m in diameter, insert a filter paper thimble into the cylinder as a diaphragm tube, fill the diaphragm tube with a mixture of manganese oxide, carbon powder, and diatomaceous earth kneaded together with methylcellulose glue, and place an outer diameter of 6.5 mm in the center. It can be made by inserting a carbon rod with a length of 150 m1 and immersing the entire body in an aqueous imidazole solution of about 1N.

This cell exhibits an electromotive force of about 1.25V at about 25°C.

Representative 1-substituted imidazoles and their melting points in the present invention are as follows.

Imidazole (m, p, 90-91°C), 2-methylimidazole (m, p, 145-147°C), 2
-ethylimidazole (m, p, 69-82°C),
2-isopropylimidazole (Lp, 128-13
3°C), 2-ethyl-4-methylimidazole (m,
p, 35 °C), 4-methylimidazole (m, p,
56°C), 2,4-dimethylimidazole (m, p
, 92°C) In carrying out the present invention, these compounds may be used alone or in a mixture of several types as required, and this may be completely dissolved in water or kneaded with water to form a paste with a water-soluble glue etc. to form an electrolyte. can be built.

In the practice of the present invention, when the electrolyte is used as an aqueous solution, the concentration of the imidazole compound is between 0.5 and 4.0.
Regulations are desirable.

The material of the anode is, for example, so-called manganese dioxide-graphite scraper, a carbon rod, a metal having a smaller ionization tendency than zinc, such as iron, nickel, tin, platinum, or a metal plated with a noble metal. The shape of the battery is arbitrary. Furthermore, the material of the container that houses the battery is also arbitrary. For example, any material such as synthetic resin metal can be used. Although the shape of the container is arbitrary, a cylindrical container is easiest and most economical to manufacture. The insulating sealing of the electrodes may be performed using epoxy resin, or may be performed by pressure-bonding, such as a dry battery method, using an elastic synthetic resin backing.

Example 1 A cylindrical filter paper with an outer diameter of about 30 mm and a length of about 90 mm was inserted as a diaphragm tube into a cylindrical cathode with an outer diameter of about 30 M and a length of about 100 mm made of a zinc plate with a thickness of 0.35 mm. It was filled with a mixture of manganese dioxide, carbon powder, and diatomaceous earth kneaded together with methylcellulose glue, and a carbon rod with an outer diameter of 6.5 mm and a length of 15 h+m was inserted into the center of the diaphragm tube. Then, the whole was immersed in an aqueous solution of about 1N 2-methylimidazole to prepare a battery. This product exhibited an electromotive force of about 1.25 V at about 25°C.

Example 2 A battery similar to that in the above example was made by replacing 2-methylimidazole with imidazole, and the electromotive force was measured, and it showed an electromotive force of about 1.25V at about 25°C.

Effects of the Invention The imidazole compound, which is an essential component of the electrolyte in the battery of the present invention, has extremely low corrosivity to metals and irritability to the skin, so troubles such as leakage can be avoided and it can be handled safely.

Claims (1)

[Scope of Claims] A zinc-manganese battery characterized by using an electrolyte containing as an essential component one or more of 1-position unsubstituted imidazoles represented by the following general formula. General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [However, R_2 in the formula
represents a hydrogen atom or an alkyl group, and R_4 represents a hydrogen atom or a methyl group. ]