JPS5857271A - Flat type organic solvent battery - Google Patents

Abstract

PURPOSE:To decrease overall height variation of a battery and improve discharge performance by mutually correlating in a specified relation a sectional area of a positive black mix and a sectional area of a negative electrode and an inner sectional area of an opening of a negative sealing plate. CONSTITUTION:In a flat type organic solvent battery, a sectional area S2 of a negative electrode 2 is limited to 70% or less of a sectional area S1 of a positive black mix 1. The sectional area S2 of the negative electrode 2 is specified in a range of 40-70% of an inner sectional area of the negative sealing plate 5. By this configuration of the battery, increase of thickness caused by volume expansion of the positive black mix and decrease of thickness of the negative electrode are balanced. As a result, increase of overall height of the battery caused by proceeding of discharge is prevented.

Description

Detailed Description of the Invention The present 1iIIIl is a flat-shaped O organic solvent battery, and more particularly, the total height change of 9 and Ii during discharge is extremely small, and
This invention relates to a flat organic hydrant battery with excellent discharge characteristics.

Organic SS batteries have a high energy of 51 degrees, can be operated in a wide range of direct ranges, have excellent storage characteristics, and are currently widely used in calculators, watches, and memory devices. .

The organic ammonium hydroxide usually has the structure shown in the figure. g is a longitudinal section showing IIMI of a flat organic solvent battery. In the figure, the positive electrode mixture generally contains manganese dioxide (MnO,) 7 fluoride ((CFx)n) in SV type batteries, and bis oxide v x ((CFx)n) in 1.5V type batteries. B is Om), copper oxide (Cub),
Mixing of cathode active materials such as iron sulfide (F@8) and iron disulfide (Fogm) with conductive material powders such as graphite and Kernock, and binder powders such as Bori Tetrafluoroethylene. After that, pellets tKjl with a predetermined cross-sectional area (S, )
Nine shapes are used.

Reference numeral 2 denotes a negative electrode, and 1 is usually a circular plate of metallic lithium having a sufficient shear area (Sm). The negative electrode 2 of the positive electrode mixture 1 and metallic lithium is globylene carnate.

r-Butyrolactone, dimethoxyethane-based organic mortar, permium, and electrolyte T-
It is still in contact with a separator 3 in which a dissolved organic electrolyte is held. In this way, a positive electrode mixture, a separator, and a negative electrode are laminated in this order, and a good product is called a power generation element.

This power generating element wire is housed in a metal (for example, stainless steel) battery case 4 which also serves as a positive terminal, with the positive electrode mixture l facing down, and from above the negative @0 also serves as a negative terminal.
A negative electrode sealing plate 5 made of metal (for example, stainless steel) having a predetermined cross-sectional area (8s) is attached to the inside of the opening. The peripheral edge of the negative electrode sealing plate 50 airtightly seals the opening of the battery case 4 via an electrically insulating gasket (hard shim) 6. Usually, the overall shape is a line-shaped one. Wow.

These organic solvent batteries have stable discharge characteristics comparable to those of conventionally widely used silver batteries, water complex batteries, etc., and can be prepared at low cost.
Currently, it is attracting wide attention as an alternative to the conventional batteries mentioned above.

By the way, in the above-mentioned organic m-medium battery, as discharge progresses, inside the battery, (1) the metal lithium, which is the negative electrode, gradually dissolves due to electrolysis, and its thickness gradually decreases. ■
On the other hand, the positive electrode mixture expands in volume and increases in thickness.

Therefore, if the two phenomena are not balanced, poor contact between the negative electrode and the positive electrode mixture will occur (if the phenomenon of ■ progresses more quickly than the phenomenon of ■), or the volume expansion of the positive electrode mixture will occur. Therefore, the total height of the battery increases (if the phenomenon of ■ exceeds the phenomenon of ■).

Generally, the increase in thickness due to volume expansion of the positive electrode mixture is significantly greater than the decrease in the thickness of the negative electrode, so the total height of the battery increases and exceeds the predetermined dimensional standard t- at the end of discharge. This results in a decrease in the battery's discharge capacity and destabilization of its discharge characteristics.

This project@Ministry and colleagues have conducted intensive research to eliminate the above-mentioned nine drawbacks of flat organic solvent batteries in which the positive electrode active material is iron disulfide and the negative electrode is metallic lithium. As a result, when the positive electrode copper-containing IO cross-sectional area S1, the negative electrode 20 cross-sectional area 8■, and the inner cross-sectional area SS of the opening of the negative electrode sealing plate 5 form a predetermined relationship, the above-mentioned phenomena ■ and ■ are balanced. They discovered that the change in total battery height is extremely small and the discharge characteristics are excellent, and completed the present invention.
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An object of the present invention is to provide an organic solvent battery with a flat side lid that exhibits extremely small changes in the total height of the battery and has excellent discharge characteristics.

The battery of the present invention is housed in a metal battery case, which holds a positive electrode mixture mainly composed of iron disulfide and an organic electrolyte, and a metal lithium negative electrode. A power generating element formed by laminating the above in this order; and the scissors power generating element 11!
In a flat organic solvent battery having a structure consisting of: a metal negative electrode sealing plate which is attached to a metal plate and is airtightly integrated with a silver battery case via an electrically insulating gasket;
llFr area C8m) is 70% or less of the cross-sectional area (Sl) of the scissors positive electrode mixture, and when opened Km negative electrode v/lIWM
R is 40% or more of the inner cross-sectional area (8 m) of the negative electrode sealing plate7
It is characterized by i at 0% or less.

In 11a of the present invention, the positive electrode mixture is a pellet containing F@8s as a main component and having an equilibrium product of 81, and the negative 4iFi fraction aO7III is Sto metal lithium lj (for example, a disk).

The first line of characteristics of the battery of the present invention is am/S between S and Sm.
This is the relationship between s≦70% and jin. am/St
exceeds 70%, the balance between the increase in the thickness and the decrease in the thickness of the negative m (!7 cm) is disrupted due to the volumetric expansion of the stone and the positive electrode mixture, and the phenomenon described in 9. height increases.

Furthermore, the second characteristic of the battery of the present invention is that a relationship of 40%≦Ss/Sm≦70% is established between the cross-sectional area of the negative electrode and the inner cross-sectional area (Sl) at the opening of the negative electrode sealing plate. * If 8 snow/8 m is less than 40%, the discharge capacity of the negative electrode (lithium) is too small, and the thickness of the negative electrode due to the progress of discharge is due to volume expansion of the positive electrode mixture. If the thickness is thicker than the increase, as a result, poor electrochemical contact between the negative electrode and the positive electrode mixture occurs, and the long-term sustainability of the discharge time is inhibited. Conversely, when %Ss/3m exceeds 70%, the thickness increase due to volume expansion of the positive electrode mixture becomes negative fI.
This results in a significant increase in the total battery height, which can be alleviated by reducing the thickness of the lithium.

The present invention (a) will only be effective if it satisfies the two characteristics at the same time, and its purpose will not be achieved if only one of the two characteristics is satisfied.

As is clear from the above explanation, the battery of the present invention has a conventional structure of 5XF-type awning #rope! In the pond, the positive electrode mixture, negative electrode,
By correlating the cross-sectional areas of each of the negative electrode sealing plates in a predetermined relationship, it is possible to suppress an increase in the total height of the battery as discharge progresses, which has great industrial value.

BEST MODE FOR CARRYING OUT THE INVENTION The battery of the present invention will be described below based on examples shown in the drawings.

Example 1 95 parts by weight of commercially available F@8m powder and 3 parts by weight of graphite powder were mixed with 2 parts by weight of * version Tet) Fawx ethylene powder, and then mixed at V<Kina. The resulting material was molded into 70 disks with a diameter of 8.7 mm and a thickness of 0.11 mm, and this was used as a positive electrode mixture. This ll1r
The WJ product (S, ) is 59.4-1.

The net value of these Ml and the thickness are both IJi■
and a negative electrode consisting of metallic lithium disks with different diameters, a 1 molar concentration of 701N bile & $-IA Hill, 2-zometoxy! Ryunodareme 3 impregnated with 0 mixed electrolyte (
4 L Robyrene non-woven fabric] was brought into contact with the needles through the center, and 70 needles of 721 types with different negative electrode cross-sectional areas (S) were prepared.

A negative electrode sealing plate s made of stainless steel and having an opening with an inner diameter of 7.0 mm was prepared. The inner cross-sectional area of this negative electrode sealing plate (
Sm) is 38.5-.

Next, place the electric element into the stainless steel battery case 4.
The negative electrode sealing plate 5 is placed on top of the negative electrode sealing plate 5, and the edge of the negative electrode sealing plate 5 is capped with a companion gasket (for example, rubber) 6 interposed therebetween.
Furthermore, the opening of the battery case 4 was opened to the inside to provide an airtight structure. In this way, 70 flat organic solvent batteries as shown in the figure, each having a diameter of 9.4 cm and a total height of 3.5 mm, were manufactured. In each case, these battery assemblies were carried out in a dry atmosphere with a relative humidity of 5 it2 or less.

The above 70 batteries were subjected to a constant load of 6.5 KQO at room temperature, and the discharge duration and total battery height at the end of discharge were kept constant.

Results t-6 types of batteries are collectively shown as an average value.

Example 2 2 parts by weight of commercially available Tetra 7R polyethylene powder were added to 95 parts by weight of commercially available Foam powder and 3 parts by weight of graphite powder, and then mixed using a Vt mixer. The obtained mixed powder was molded into 11 discs with a diameter of 8.7 mm and a thickness of 0.9 mm.
0 sheets were produced, and this was used as positive electrode mixture 1. This cross-sectional area (S
l) is 59.4-.

Next, the thickness of these positive electrode mixtures will be 41.8 cm.
A separator 3 impregnated with a propylene car in which 1 mol of 1 IfO lithium perchlorate is impregnated with a donor electrolyte of nate and l,2-dimethoxyethane ( −rideropyrene nonwoven fabric), and the negative electrode cross-sectional area (& )
0 different 1111111 various power generation forms *10 needle 1
I made 10 pieces.

Next, as shown in Figure 12, these power generation requirements are stored in a stainless steel-like battery case 4 of a battery cell for special value measurement in the form of a tan battery, and a stainless steel current collector 7 is provided on top of the battery case 4. Pressed with Teflon 1it) 7ta 8.

A constant load discharge of 6.5 KB was performed on the above 110 batteries at room temperature, and the discharge duration and the change in the total height of the batteries at the end of the discharge were measured. The results are collectively shown in the table as average values for each type of battery.

As is clear from the table, when Ss/St exceeds 70%, the total height change rapidly increases.

[Brief explanation of the drawing]

Figure 1 shows a typical flat type organic electrolyte akO! IfFW
FIG. I and FIG. 2 are cross-sectional views of the battery tube for measuring characteristics. 1...Positive electrode mixture, 2...Negative electrode, 3...Nanonorator for holding organic electrolyte, 4...Battery case, 5...
・Negative electrode sealing plate, 6... gasket, 7... current collector,
8... Lid made of thiamine, Sl... Cross-sectional area of positive electrode mixture, 81... Cross-sectional area of negative electrode, Ss... Inner cross-sectional area of negative electrode sealing plate.

Claims (1)

[Scope of Claims] Metallic/AO battery case: A battery case that was used in the war and that holds a positive electrode mixture mainly composed of iron disulfide and an organic electrolyte, and a battery case made of metallic lithium. Power generation is achieved by stacking the negative electrode and the negative electrode in this order! ! Bulk; and armpit electric element Kj! i! OIA
In the case of lI electrical conduction, the cross-sectional area of the scissors negative electrode is less than or equal to the cross-sectional area of the scissors positive electrode gold material (07011), and at the same time, the cross-sectional area of the scissors negative electrode is inside the scissors negative electrode sealing plate II? Area 040
A flat 4# & solvent battery characterized in that: -70- or less.