KR800000496B1 - Manufacturing method of alkaline battery (zn-ag) - Google Patents

Abstract

The dry cell which can obtain contant closed-cct. voltage and high discharge capacity per unit capacity is disclosed. Separators(6,7,8) are laminated and fixed between the main and the subactive materials to smooth ion exchange. A packing(3) inserted into the junction part of outer housing(11) and cap(I) is attached to the sawtooth-shaped face to prevent from leakaging electroyte of the dry cell.

Description

Manufacturing method of divalent silver oxide-zinc-based alkali silver oxide battery

1 is a cross-sectional view of a divalent silver oxide-zinc based primary alkali silver oxide battery.

The present invention relates to a method for manufacturing a silver zinc oxide-based primary alkali silver oxide battery, the object of which is to obtain a high discharge capacity and a high constant closed-circuit voltage per unit of capacity regardless of the storage date, there is no leakage phenomenon It is to provide a primary alkali silver oxide-based battery of divalent silver oxide-zinc, which reduces the defect rate and makes manufacturing cost low.

Conventional silver oxide-zinc-based batteries have many defective products due to the natural consumption of closed circuit voltage, discharge capacity decrease and leakage phenomenon due to long-term storage, and the scope of application (aircraft, ships, satellites, missiles, various electronic devices, communication) Equipment, medical devices, hearing aids, electronic clocks, etc. are wide, but they are not generalized due to the high manufacturing cost.

The present invention has been studied for the purpose of improving such drawbacks, the production method will be described in detail by the following drawings.

As the positive electrode active material, a divalent silver oxide (80.13% in the amount of silver of metal), monovalent silver oxide (2.46% in the amount of silver of metal), 2% of smoking, 0.7% of a binder, and 38% of calcium hydroxide are used as an electrolyte. Used 5% zinc amalgam (4-14%), and the three layers of membranes, each with different ion exchange roles, consisted of a layer of polyethylene grafted with methacrylic acid (6) and cellofane. A layer of 0.0022 inch thin film obtained by laminating and fixing the layer 7 and the nonwoven polyamide fiber cloth layer 8 and the reducing metal layer 9 is electrolytically reduced in a 10% potassium hydroxide (KOH) solution. Was used. Then, in order to prevent the leakage phenomenon, the grooves (12) and (13) of several upper grooves (12) and (13) are formed on the inner surface of the upper end of the outer shell (11) and the lower surface (2) of the cap (1). .

In the present invention, forming the reduced metal layer 9 on the surface of the main active material layer 10 has a single reduction layer using divalent silver oxide to reduce manufacturing defects, and forms a triple separator layer. This is to prevent the generation of the electrochemical reaction interfering substances by reacting the main active material and the alkaline electrolyte during exchange so that ion exchange can be performed smoothly.

In order to help the understanding of the present invention, the discharge reaction process will be described with a chemical equation.

First, the reaction occurring at the cathode is amalgamated zinc electrode [Zn (Hg)] is reacted with potassium hydroxide (KOH) as follows.

And a _{= Zn (OH) 2 + 2e} , Zn (OH) 2 is OH around the back ^{- -} Zn (Hg) + 2OH reacted with Zn (OH) ₂ + 2OH ^- is a ^- = Zn (OH) ₄ On the surface of the Zn electrode, the positive electrode reaction terminates as the dehydration reaction takes place in order to release the required water, and the negative electrode (Zn) surface is passivated. In other words

_{Zn (OH) 2 = ZnO +} H 2 O Zn (OH) 4 - = 2OH - + Z n O - + H 2 O

In summary, the various reactions

It is possible → ZnO + H ₂ O + write turn into 2e ^- Zn + 2OH. In the anodic reaction, divalent silver oxide (AgO) becomes 2AgO + H ₂ O + 2e = Ag ₂ O + 2OH ^- from the surface as soon as water and electrons are supplied, and Ag ₂ O continues to be 2Ag ₂ O + H ₂ O + 2e = 2Ag + 2OH ^- to form a metal Ag. Eventually, the anodic reaction becomes AgO + H ₂ O + 2e = Ag + 2OH ⁻ as a reduction reaction.

In the ion migration situation between the cathode and the anode, OH ⁻ ions move from the anode to the cathode through the diaphragm.

Example 1

Divalent silver oxide (80.13% metal silver content), monovalent silver oxide (2.46% metal silver content), graphite 2%, binder 0.7% main active material and 5% zinc amalgam negative active material A metal reducing layer 9 having a thickness of 0.0022 inches obtained by electrolytic reduction in an electrolyte absorbing membrane 5 and a separator 6 (7) (8) having a different ion exchange between them, and a 10% potassium hydroxide (KOH) solution. In order to prevent the leakage and the leakage phenomenon, the packing (3) inserted into the junction between the outer shell (11) and the cap (1) was brought into close contact with the serrated face.

The divalent silver oxide-zinc based primary alkali oxide battery produced by the above method has a high current density of 300 mil A / cm ² or more, unlike the conventional one, and is 1.33-1.40 Volt After 13 months, the battery was still maintained as a battery, and the discharge capacity was 30-40% larger than that of monovalent silver oxide. In addition, as a result of the opening of several grooves 12 and 13 on the upper inner surface of the outer shell 11 and the lower outer surface of the cap 1, there was no leakage phenomenon, and it was possible to efficiently make a high quality silver oxide battery than the conventional one. .

Claims (1)

Laminating and fixing a separator layer having different ion exchanges between the positive electrode active material and the negative electrode active material so as to facilitate ion exchange, and the packing inserted into the junction between the outer shell and the cap is in close contact with the tooth-shaped surface. A method for producing a divalent silver oxide-zinc-based alkaline battery, characterized by preventing leakage.

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