JPS60150553A - Nonaqueous electrolyte cell - Google Patents

Abstract

PURPOSE:To suppress an increase of the inner resistance at the later period of discharging and improve the discharge characteristic by adding titanium sulfide to a positive electrode using iron disulfide as the active material. CONSTITUTION:A pellet molded by pressure with the positive electrode black mix made by adding acetylene black and graphite as conductive agent and fluororesin powder as binding agent to a mixture of iron disulfide and titanium sulfide than thoroughly mixing them is burnt at a temperature of 200-300 deg.C to form a positive electrode 1. A punched lithium rolled plate is used for a negative electrode 4. In addition, a mixed solvent of propylene carbonate and 1,2-dimethoxyethane solved with lithium borofluoride, for example, is used as the electrolyte. Accordingly, an increase of rhe inner resistance at the later period of discharging is suppressed, and the discharge characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a non-aqueous electrolyte battery in which a disulfide needle is used as a positive electrode active material ML.

(II+> Conventional technology Lithium, sodium, or an alloy thereof is used as a negative electrode active material, and metal oxides, sulfides, chlorides, and metals are used as negative electrode active materials.
Lithium perchlorate, lithium borofluoride,
Nonaqueous electrolyte batteries that use dissolved inorganic salts such as aluminum lithium as the electrolyte have the advantage of having high energy density and low self-discharge.
In recent years, it has attracted particular attention, and to date, there have been no proposals for 3, OV-based non-aqueous electrolyte batteries that use -monocarbon manganese oxide or carbon sulfate as positive electrode active materials.

On the other hand, as disclosed in Japanese Patent Publication No. 56-313794, disulfide needle (FeS2) is used as a positive electrode active material.
Using this method, a 1.5V non-aqueous electrolyte battery can be obtained, which has the advantage of being able to replace existing dry batteries and alkaline batteries.

(c) Purpose of the Invention The present invention aims to improve the battery characteristics of a 15-type non-water-dissolved liquid ball pond using a disulfide needle as a positive active material.

(2) Structure of the Invention The present invention includes a negative electrode using lithium, sodium, or an alloy thereof as an active material, a positive electrode using Z iron sulfide as an active material, and a non-aqueous electrolyte, wherein the positive electrode is A non-aqueous electrolyte battery characterized by adding titanium sulfide.

(e) Examples Examples of the battery of the present invention will be described in detail below.

Titanium sulfide (TiS2) on commercially available iron disulfide (FeS2)
10% by weight of acetylene 77 and graphite as a conductor 1E agent and 10% by weight of graphite as a binder.
Add 5% by weight of base resin powder and mix thoroughly to form a T.
Pereno 1~ with a thickness of 11 mm and a thickness of 11 mm is obtained, and then Otsu no Beshi 71~ is fired at a temperature of 200~300°C to form a τ mold.

The negative electrode is a lithium plate with a thickness of 0.61 [1111 If-
This rolled plate was then punched into a diameter of 150 m.

The electrolyte is a mixed solvent of propylene carbonate and 12-methylene-quinethane containing 1 mol/1 of fluorocarbonate.
! It is dissolved.

Figure 1 shows a cross-sectional view of the battery of the present invention. (1) is the positive electrode, and the inner bottom surface of the positive electrode can (2)
The pressure contact is broken through. Further, (4) is crimped to the inner bottom surface of the negative electrode-C (negative electrode can 5) via the negative electrode current collector (6). (7) is a separator made of polypropylene woven fabric, and (8) is an insulating backing.

Figure 2 shows the relationship between the battery of the present invention (A) and the conventional battery (B') at an angle of 20 degrees.
A comparison of the discharge characteristics and internal resistance characteristics when a constant load discharge of 18 Ω was applied to 156 ohms in C.

Incidentally, in the -iron sulfide 11' electrode of the conventional battery <B), the sulfide 7 was not completely added.

As is clear from FIG. 2, in the battery of the present invention (A), the increase in internal resistance during the latter stages of discharge is suppressed compared to the conventional battery (B), and the discharge characteristics are improved. I understand.

Considering the second reason - 4 - In the case of conventional iron disulfide batteries, the internal resistance only increases due to the increase in discharge products during the late stage of discharge, either for unknown reasons or due to an increase in discharge products. However, in the case of heavy oil according to the present invention, M
It is thought that the sulfuric acid sulfate of the 3rd additive is involved in the reaction, and that the reaction product of butane sulfide acts to suppress the increase in internal resistance of the positive electrode. .

Note that the effect will be insufficient unless the amount of titanium sulfide added is at least 10% by weight based on the weight of the positive electrode, and if it is added over 300% by weight, the filling amount of iron disulfide, which is the main oil substance in the positive electrode, will be insufficient. It is best to avoid it because it is 11 tables, chants, and -ta.

Therefore, the amount of addition of titanium sulfide is preferably about 10 to 300% by weight based on the weight of the mold.

(F) Effects of the Invention According to the battery of the present invention, since titanium sulfide is added to the positive electrode, which uses iron disulfide as an active material, the internal resistance that increases by 1° in the late stage of release is suppressed. ,,,! Ii electric characteristics or reform I! ￥
In particular, it is extremely useful for the practical application of 1.5V non-aqueous electrolyte batteries, which have a battery voltage that is almost the same as that of existing dry batteries and alkaline batteries. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the battery of the present invention, and FIG. 2 is a comparison diagram of battery characteristics between the battery of the present invention and a conventional battery. . 1) - Positive electrode, 2) - Positive electrode can, 3) - Positive electrode current collector, (4) - Negative electrode, (5) - Negative electrode can, 6) Negative electrode current collector, (7) - Separator. , (8) ・Insulation bar/
King. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano

Claims (1)

[Claims] ■ A device comprising a negative electrode using lithium, sodium, or an alloy thereof as an active material, a positive electrode using a disulfide needle as an active material, and a non-aqueous electrolyte. A non-aqueous electrolyte battery characterized by: