JPS59151756A - Method of impregnating plate for nonaqueous battery with electrolyte - Google Patents

Abstract

PURPOSE:To suppress contamination by water during electrolyte impregnation so as to improve the preservation performance of a plate for a nonaqeuous battery which s influenced by water content by impregnating the plate with nonaqueous electrolyte contained in a case the opening of which is sealed with a sealing member principally consisting of a water-absorbing agent. CONSTITUTION:A nonaqueous electrolyte 2 prepared by dissolving 1mol/l of lithium perchlorate in a mixture solvent consisting of equal volumes of porpylene carbonate and 1,2-dimethoxyethane, is contained in a cup-like stainless-steel case 1. The water content of the electrolyte 2 is adjusted to around 10-20ppm beforehand by means of a water-removing device. A sealing member 3 is made by packing into an annular stainless-steel frame 4 kneaded mixture 5 prepared by kneading zeolite working as a water-absorbing agent with polyvinyl alcohol, then drying the packed mixture 5. Positive plates 6 containing manganese dioxide as an active material are impregnated with the electrolyte 2 by putting such a liquid imprgnation case as above in a dry box with a water content of around 200ppm and immersing the positive plates 6 in the electrolyte 2.

Description

[Detailed description of the invention] (a) Industrial application field The present invention uses light metals such as lithium and sodium as negative electrode active materials, metal oxides, sulfides, halides, etc. as positive electrode active materials, and propylene as an electrolyte.・Regarding nonaqueous batteries that use inorganic solutes such as lithium perchlorate, lithium chloride, and lithium sulfide dissolved in organic solvents such as carbonate, γ-butyrolactone, and tetrahydrofuran alone or in combination, particularly This invention relates to an improvement in a method of impregnating an electrode plate with a liquid.

(b) Prior Art In this type of battery, since the light metal used as the negative electrode active material is highly reactive with moisture, it is necessary to remove as much moisture as possible from the electrode plate and the electrolyte.

Taking these points into consideration, the IT electrode plate is manufactured by removing moisture through heat treatment or the like, and an electrolyte is also used therein.

When impregnating the electrode plate with electrolyte, the water content is 20
The electrode plate is immersed in a non-aqueous electrolytic solution housed in a lip-shaped container in approximately 0 ppm Drybolix.

However, in the conventional method, since the top surface of the dry bottle is open, it is undeniable that trace amounts of water in the dry bottle mix into the non-aqueous electrolyte.

(c) Purpose of the Invention The purpose of the present invention is to suppress the contamination of moisture during impregnation of an electrode plate with a liquid, thereby improving battery performance.

B) Structure of the Invention The present invention has been made to achieve the above object, and includes immersing an electrode plate in a non-aqueous electrolyte stored in a cup-shaped container, and filling the opening of the container with a moisture absorbent. The present invention proposes a method for impregnating an electrode plate for non-aqueous foaming with a liquid, which is characterized in that the electrode plate is impregnated with a non-aqueous electrolyte while being sealed with a sealing member.

(e) Examples Embodiments of the method of the present invention will be described below with reference to the drawings.

The figure shows a cross-sectional view of a container for liquid impregnation used in the method of the present invention. (1) is a lip-shaped container made of stainless steel, inside which 1° of propylene carbonate is stored. It is. Incidentally, this electrolytic solution has been previously subjected to moisture removal using a moisture removal device (not shown) so that its moisture content becomes 10 to 20 ppm.

(3) is a sealing member constructed by filling and drying a mixed material (5) made by kneading zeolite, which is a water absorbent, and polyvinyl alcohol, into a stainless steel annular frame (4). In addition to zeolite, molecular sieve can also be used as a moisture absorbent.

Then, this liquid impregnating container is placed in Drybolix with a water content of about 200 ppm, and the positive electrode plate (6) containing manganese dioxide as an active material is immersed in the container.
impregnated with electrolyte.

The table below shows the relationship between the immersion time and the water content in the positive electrode plate according to the present invention and the conventional liquid impregnation method.

Table Water content in the dry box; Water content in the 20-port PPm electrolyte; 10 to 20 ppm It can be seen that the water content in the electrode plate did not increase even after the passage of time.

This is because in the method of the present invention, the opening of the container for liquid impregnation is closed with a sealing member mainly made of a moisture absorbent, which prevents trace amounts of moisture in the dry box from entering the container during the electrolyte impregnation process. This is also thought to be because a trace amount of water in the electrolyte is absorbed by the water absorbent.

Therefore, if the method of the present invention is applied to incorporate a positive electrode plate into a battery, battery performance, especially storage performance which is affected by the amount of water, can be improved.

[Brief explanation of the drawing]

The figure shows a cross-sectional view of a container for liquid impregnation used in the method of the present invention. (1)...Cup-shaped container, (2)...Non-aqueous electrolyte,
(3)...Sealing member mainly composed of moisture absorbent, (6)...
...Positive plate. ° et al

Claims (1)

[Claims] ■ An electrode plate is immersed in a non-aqueous electrolyte stored in a lip-shaped container, and the non-aqueous electrolyte is poured into the electrode plate while the opening of the container is sealed with a sealing member mainly made of a moisture absorbent. A method for impregnating an electrode plate for a non-aqueous battery with a liquid, the method comprising impregnating an electrode plate with a liquid.