JPS59148279A - Nonaqueous electrolyte battery - Google Patents

Abstract

PURPOSE:To decrease absorbing time of electrolyte to a positive mix, decrease the vaporising amount of organic solvent in electrolyte, decrease scattering of discharge performance, and increase reliability by mixing fiber material of polyethylene, glass, or polypropylene to a positive mix. CONSTITUTION:A fiber material 30 of polyethylene, glass, polypropylene is mixed to a positive mix 16 in addition to a conductive material and a binder. The fiber material 30 is mixed to the positive mix 16 so that it is interwined and dispersed. Since the mixed fiber material 30 absorbs and holds the large amount of electrolyte, absorbing ability of the postive mix 16 is increased. When nonaqueous electrolyte containing volatile solvent is poured, it is absorbed in the poisitive mix 16 before vaporizing of volatile solvent. Therefore, the time from electrolyte pouring to sealing of a battery is remarkably shortened. Thereby, vaporising of volatile solvent in the electrolyte is decreased and scattering of discharging performance is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-aqueous electrolyte battery using light metals such as lithium, aluminum and magnesium for the negative electrode.

A non-aqueous electrolyte battery can obtain a high theoretical energy density by using a chemically active light metal such as lithium for its negative electrode. Therefore, it is suitable for constructing high-performance batteries, especially in the field of button-type or flat-type small batteries.

FIG. 1 shows a typical conventional example of a non-aqueous electrolyte battery. The battery shown in the figure includes a power generating element 10 consisting of a negative electrode 12 made of light metals such as lithium, aluminum, and magnesium, a separator 14 impregnated with a non-aqueous electrolyte, and a positive electrode mixture 16, a negative electrode terminal 22, an insulating gasket 24 It is housed and sealed in a button-shaped battery case 20 consisting of a positive electrode can 26 and a positive electrode can 26. The positive electrode mixture 16 is obtained by kneading and press-molding an active material such as manganese dioxide together with a conductive additive and a suitable binder. This positive electrode mixture 1
6 is fitted with a reinforcing positive electrode ring 18 if necessary. This positive electrode ring 18 serves not only for reinforcement but also for enhancing the current collecting effect of the positive electrode.

Incidentally, the non-aqueous electrolyte used in this type of non-aqueous electrolyte battery is often one in which a suitable electrolyte is dissolved in an organic solvent. In general, many of these organic solvents are volatile. Therefore, in the process of assembling a battery, even while the electrolyte is injected and absorbed into the positive electrode mixture, a considerable amount of the organic solvent in the electrolyte evaporates. Therefore, after pouring the electrolytic solution, it is necessary to quickly cover the container tightly before the solvent evaporates too much. However, the sealing can only be performed after the liquid electrolyte is sufficiently absorbed into the positive electrode mixture 16. If the container is sealed with the liquid electrolyte remaining unabsorbed, problems such as the electrolyte being pushed out to the outside may occur during sealing. However, in the past, it took a long time for the injected electrolyte to be sufficiently absorbed into the positive electrode mixture. Therefore,
During this time, some organic solvent may evaporate (
<'i< was done.

However, the problem here is that the amount of evaporation of the organic solvent is not constant depending on, for example, the surrounding environment. For this reason, the amount of organic solvent evaporated is small for each battery or for each manufacturing lot, which increases the dispersion in the discharge M capacity and becomes a major cause of lowering the reliability of the battery.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to absorb the injected non-aqueous electrolyte into the positive electrode mixture without making any structural changes. The time required for discharging can be significantly shortened compared to conventional methods, thereby reducing the amount of time the organic solvent in the electrolyte evaporates, reducing variations in discharge performance and increasing reliability. An object of the present invention is to provide a non-aqueous electrolyte battery. .

In order to achieve the object stated in -1-, the present invention provides a power generation element consisting of a negative electrode made of light metals such as lithium, aluminum and magnesium, a separator impregnated with a non-aqueous electrolyte, and a positive electrode mixture, in a battery case. The non-aqueous electrolyte battery is characterized in that a tJAH-like substance such as polyethylene, glass, polypropylene, etc. is mixed into the positive electrode mixture.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. Note that the same reference numerals are used for the middle portions of each figure or corresponding portions.

FIG. 2 shows an embodiment of a non-aqueous electrolyte battery according to the present invention. The basic structure of the battery shown in the figure is the same as the conventional battery described above. First, a power generation element 10 consisting of a negative electrode 12 using lithium, which is a light metal, a separator 1 impregnated with a non-aqueous electrolyte, and a positive electrode mixture 16 is prepared.
has. This power generation element 10 is housed and sealed in a button-shaped battery case 20 consisting of a negative electrode terminal 22 , an insulating gasket 24 and a positive electrode can 26 . The above positive electrode mixture 1
6 is fitted with a positive electrode ring 18 which has both a reinforcing effect and a current collecting effect. The non-aqueous electrolyte to be absorbed by the positive electrode mixture 16 is one in which a suitable electrolyte is dissolved in a volatile organic solvent. Negative electrode terminal 22 and positive electrode can 2
6 is a non-aqueous electrolyte resistant metal, specifically stainless steel.

Here, the positive electrode mixture 16 is prepared by kneading a positive electrode active material such as manganese dioxide, a conductive additive such as carbon, and a suitable binder, and then press-molding the mixture into a predetermined shape. At this time, an 8M-like substance 30 such as polyethylene, glass, polypropylene, etc. is mixed in advance in the mixture 16 in addition to the S electrical auxiliary agent and the binder. This m-male substance 30 is mixed into the positive electrode mixture 16 so as to be intertwined and dispersed therein.

As described above, when the fibrous substance 30 is mixed into the positive electrode mixture 16, the mixed lli fibrous proboscis substance 30 absorbs and retains the electrolyte, and as a result, the positive electrode mixture 16 The absorption power of the electrolyte is significantly increased. Therefore,
Even when a nonaqueous electrolyte containing a volatile organic solvent is injected, the liquid is absorbed into the positive electrode mixture 16 more quickly than the volatile components evaporate. . This makes it possible to significantly shorten the time from injecting the electrolytic solution to sealing the battery, reducing evaporation of volatile components in the electrolytic solution, and significantly reducing variations in discharge performance. As a result, a highly reliable battery with stable quality can be obtained. Furthermore, in addition to the above-mentioned effects, the m- and m-like substances 30 mixed into the positive electrode mixture 16 also provide an action bed that strengthens the positive electrode mixture 1G to increase its mechanical strength. This is possible.

J's''-, the non-aqueous electrolyte battery according to the present invention is
A comparatively simple method of mixing lIImI substance into the positive electrode mixture
With this unique configuration, it is possible to significantly shorten the time from non-aqueous electrolyte liquid to sealing the battery, reduce evaporation of the liquid electrolyte, and reduce variations in discharge performance. can be significantly reduced to improve reliability, and furthermore, the mechanical strength of the positive electrode mixture can be increased to further improve quality stability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional non-aqueous electrolyte battery, and FIG. 2 is a sectional view showing an embodiment of a non-aqueous electrolyte battery according to the present invention.

Claims (1)

[Claims] (1) A nonaqueous electrolyte battery in which a negative electrode made of light metals such as lithium, aluminum, and magnesium, a separator impregnated with a nonaqueous electrolyte, and a power generation element made of a positive electrode mixture are sealed in a battery case. In the above-mentioned positive electrode mixture, polyethylene and glass are included. A non-aqueous electrolyte battery characterized by containing a fibrous substance such as polypropylene.