JPS63202845A - Nonaqueous electrolyte battery - Google Patents

Abstract

PURPOSE:To increase the sealing capability and the leakage resistance of a battery by using a sealant comprising asphalt of base material and a specified material. CONSTITUTION:A sealant 7 is prepared by adding 5-15 wt.% atactic polypropylene to asphalt which is the base material. The sealant 7 is placed between an insulating gasket 6 and a positive terminal case 2 and between the insulating gasket 2 and a negative terminal plate 4. By using this sealant 7, the generating rate of crack or peeling off caused by dissolution of asphalt into an organic solvent, the expansion, and deterioration of the asphalt can be decreased. Therefore, the sealing capability between the gasket and the positive terminal case and between the gasket and the negative terminal plate is enhanced and the leakage resistance of the battery is increased.

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention relates to nonaqueous electrolyte batteries using light metals such as lithium, sodium, or alloys thereof as negative electrode active materials. Since the light metal used as the negative electrode active material is highly reactive with moisture, high airtightness is required to prevent moisture from entering from the outside.

Therefore, it has been proposed to interpose a sealant between the insulating PAVKING and the positive electrode terminal member and the negative electrode terminal member9.
As a sealant, for example, asphalt as disclosed in JP-A-56-32671 and JP-A-58-10365 is generally used. ◇ ＼ Problems to be Solved by the Invention Asphalt-based sealants have the problem of dissolving in electrolytes, swelling and softening, or causing siflux due to deterioration. Not suitable for electrolyte batteries.

2.Means to solve the problem 5.5 to 15% of atactic polypropylene is added to the asphalt.
When added in wt%, dissolution of asphalt in organic solvent,
The incidence of cracking and peeling due to swelling and deterioration can be reduced. It also prevents asphalt from softening during high-temperature storage, improving sealing performance.

To, Example Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a flat non-aqueous electrolyte according to an embodiment of the present invention! A vertical cross-sectional view of the pond is shown, and in the figure (1) is a positive electrode containing manganese dioxide as an active material, which is disposed on the inner bottom surface of a metal case (2) which also serves as a positive electrode terminal.

(3) is a negative electrode made by cutting a lithium plate into a predetermined size, and is pressed onto the inner bottom surface of the sealing lid (4) which also serves as a negative electrode terminal. (5) is a separator made of polypropylene nonwoven fabric, and contains 1 mol/l of lithium perchlorate in a mixed solvent of propylene carbonate and dimethoxyethane! It is impregnated with a non-aqueous electrolyte subjected to RI.

(6) Insulating packing for the Haboripropylene exhibition.

Therefore, (7) is a coating of a sealant which is the gist of the present invention, in which 1% of mineral oil is added as a gravel agent to asphalt.
Added 5-15% of atactic polypropylene 1
Is this mixture mixed at a temperature of 20 to 150°C and solidified? It is formed by coating and drying a solution dissolved in an organic solvent such as xylene. The dimensions of one battery were an outer diameter of 20.0 mm and a thickness of 1.6 mm.

Figure 2 shows the temperature at 70°C when the amount of atactic polypropylene added in the battery sealant shown in Figure 1 was varied.
Storage test in an environment of ℃, relative humidity 90% and temperature 60
This shows the rate of leakage of the battery after it has been subjected to a cycle test (6 cycles/day) that repeats storage at 10°C and -10°C for 50 days. In Figure 2, the solid line indicates the case of the storage test. , the broken lines indicate the case of the cycle test.0 From Figure 2, the amount of attached polypropylene added is 5
It can be seen that at ~15% by weight, the wave generation rate for θ is also significantly reduced. This is done with an added amount of less than 5%! 7:l
The effect of preventing cracks and peeling due to dissolution, swelling, and deterioration of Niasphald in the electrolyte is not sufficient, and if the concentration exceeds 15%, the hardness becomes too high and may cause damage to the positive and negative terminal members or insulation Viking. It is thought that as the adhesion deteriorates, the rate of residual liquid generation increases by 1.

FIG. 6 shows a vertical cross-sectional view of essential parts of a cylindrical non-aqueous electrolyte battery according to another embodiment of the present invention, and 1101 is added to the figure number in FIG. 1 for elements corresponding to those in FIG. 1. It is indicated by the figure number.

G. Effects of the invention As mentioned above, as a sealant, 5 to 15% by weight of atactic polypropylene is added to the main ingredient mainly composed of asphalt.
By using the additive, it is possible to improve the sealing between the insulating packing and the positive electrode terminal member and the negative electrode terminal member, and to improve the leakage resistance. In particular, light metal I, which is highly reactive with moisture, can prevent the intrusion of external moisture.
A non-aqueous electrolyte battery with A as a negative electrode active material (/i:
Its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a flat battery according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the zero additive amount of atactic polypropylene in the sealant and the leakage rate, and FIG. 2A and 2B respectively show longitudinal cross-sectional views of main parts of cylindrical batteries according to other embodiments of the present invention. +11 (Lυ... Positive electrode, +21 (13... Positive electrode terminal member, (3) σ... Negative electrode, (4) α... Negative electrode terminal member, (5) α9... Separator, +61 (16 )・・
- Insulating packing, (7) αη...Sealing agent.

Claims (1)

[Claims] (1) A power generation element consisting of a positive electrode, a negative electrode whose active material is a light metal, a separator, and a non-aqueous electrolyte is placed in a battery container composed of positive and negative terminal members and insulating packing that electrically insulates between these members. In the battery, a sealing agent containing 5 to 15% by weight of atactic polypropylene is interposed between the insulating packing and the positive terminal member and the negative terminal member. A non-aqueous electrolyte battery characterized by: