JPS5910505B2 - Method for manufacturing electrochemical potential storage element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electrochemical potential storage element having a characteristic that its potential changes approximately linearly depending on the amount of current applied.

As shown in Figure 1, this type of element consists mainly of silver chalcogenide and has a pair of electrodes Al and A that have a certain potential with respect to silver.
It has a structure in which a silver ion conductive solid electrolyte E is sandwiched between the two, and the device potential shows a value depending on the activity of silver in silver chalcogenide.

That is, in FIG. 1, for example, if a direct current is applied in a direction that makes electrode Al positive and electrode A2 negative, the activity of silver in the silver chalcogenide constituting electrode Al decreases, and the potential difference between the two electrodes decreases. When the current flow direction is reversed, the activity of silver in the electrode Al increases and the potential difference between the two electrodes decreases. The relationship between this potential difference and the quantity of electricity shows approximately linearity when the current density is 100 pA/Cd or less.

Now, when manufacturing this element, as shown in FIG. 3, a terminal plate 14 to which a lead wire 12' is spot-welded, an electrode pellet 12, a solid electrolyte pellet 13, and an electrode pellet 11 are sequentially laminated inside a cylindrical exterior resin case 10. Then, the terminal plate 15, which has a screw stud formed in the screw groove 10' formed in the opening end of the case 10, is screwed together, and the above-mentioned stack is pressed under high pressure to make them come into close contact, and then the resin mold is formed. 16
The device was then completed.

In the above manufacturing method, the number of parts is large, making the manufacturing process complicated, and there are concerns that the pellets may be destroyed if the parallelism of each pellet and terminal plate stacked on the case 10 is not sufficient during crimping. It had

The present invention has been made with these points in mind, and aims to reduce the number of parts and simplify the manufacturing process by using a method of sintering each pellet when stacking them closely.

An embodiment of the present invention will be described in detail below.

A solid electrolyte pellet made of Agl-Ag4P2O7 thread solution is sandwiched between a pair of electrode pellets made of Ag2Se-Ag3P04 solid solution and a lead wire is fixed to one side by spot welding.
Heat treatment at 0°C temperature.

This heat treatment temperature is close to the melting temperature of the solid electrolyte, but it is necessary that the temperature is such that the electrode is maintained in a stable state. Incidentally, the melting temperature of the Ag2Se-Ag3P04 thread solution is about 400°C, and the melting temperature of the Ag2Se-Ag4P2O7 system-
That of the solid solution is about 240°C.

Now, the solid phase reaction is carried out by the heat treatment described above, and the electrode and solid electrolyte are sintered.

This sintered body is taken out, dipped in a thermosetting resin bath, and then hardened in a mold to form a completed device.

Figure 2 shows a cross-sectional view of the device obtained by the method of the present invention.
3 is an electrode having lead wires 1'' and 2'', 3 is a solid electrolyte, and 4 is a resin mold. As mentioned above, the present invention relates to a method for manufacturing an electrochemical potential storage element, in which a silver ion conductive material having a lower melting temperature than the electrode constituent material is placed between a pair of electrodes mainly composed of silver chalcogenide. This method is characterized by sandwiching a solid electrolyte and then sintering it at the melting temperature of the solid electrolyte, which reduces the number of parts and simplifies the manufacturing process compared to a manufacturing method using a pressure bonding method. .

[Brief explanation of the drawing]

Figure 1 is a diagram explaining the principle of an electrochemical potential storage element, Figure 2 is a cross-sectional view of the element obtained by the method of the present invention, and Figure 3 is a cross-sectional view of the element obtained by the manufacturing method that is the premise of the method of the present invention. It is. 1, 2... Electrode, 3... Solid electrolyte,
1″, 2″・・・Lead wire, 4・・・Resin mold.

Claims (1)

[Claims] 1 Between a pair of electrodes whose main constituent is silver chalcogenide,
A method for manufacturing an electrochemical potential memory element, comprising: sandwiching a silver ion conductive solid electrolyte having a melting temperature lower than that of the electrode constituent material, and then sintering at the melting temperature of the solid electrolyte.