JP2701693B2 - Method for producing gelled negative electrode for alkaline battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a gelled negative electrode for an alkaline battery which can increase the productivity of a gelled negative electrode used for an alkaline battery.

[0002]

2. Description of the Related Art Conventionally, as a method for producing this kind of gelled negative electrode, an alkaline electrolyte is mixed with a gelling agent and a superabsorbent resin to form a gel electrolyte, into which zinc powder is added and mixed. And a method in which zinc powder is dry-blended with a gelling agent and a superabsorbent resin and mixed with an alkaline electrolyte.

[0003]

However, in the method of dry mixing, sufficient swelling was not achieved due to the use of the superabsorbent resin, and the mixing time had to be extended to obtain a predetermined gel viscosity. . In addition, in the method of preparing a gel electrolyte, a long-time mixing was required to completely disperse the gelling agent in the alkaline electrolyte.

[0004] In view of the above circumstances, it is an object of the present invention to provide a method for producing a gelled negative electrode for an alkaline battery which can reduce the mixing time even when a superabsorbent resin is used. .

[0005]

That is, the present invention provides a method of preparing a swelling solution by mixing a superabsorbent resin and an alkaline electrolyte, and mixing zinc powder, a gelling agent and an alkaline electrolyte. After the mixture is prepared, the swelling liquid and the mixture are mixed to produce a gelled negative electrode.

[0006] The amount of the alkaline electrolyte contained in the swelling liquid is 13 to 51% of the total amount of the alkaline electrolyte.

[0007]

According to the present invention, the superabsorbent resin swells in advance, so that the mixing time does not need to be extended in the production of the gelled negative electrode.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a graph showing the change in gel viscosity with mixing time.

First, the absorption capacity is 500 times of deionized water,
0.5% by weight of a 30-fold water-absorbent resin (Rheologic QP manufactured by Nippon Pure Chemical Co., Ltd.) of 0% by weight KOH solution was added to an alkaline electrolyte (40% by weight KOH, ZnO saturated) 2, 5, 10, 1
The swelling liquid was prepared by swelling overnight at 5, 20% by weight.

On the other hand, 60% by weight of zinc powder and 0.5% by weight of polyacrylic acid (gelling agent) are dry-mixed, the swelling solution is mixed therein, and the alkaline electrolyte is further reduced to 39% by weight in total. The resulting mixture was mixed to obtain a gelled negative electrode.

For the five types of gelled negative electrodes thus obtained (Examples 1 to 5, see Table 1) and the gelled negative electrode obtained by the conventional dry mixing method (conventional example), the change in gel viscosity according to the mixing time is shown. Examined. The results are shown in FIG.

In this embodiment, the ratio of the superabsorbent resin to the alkaline electrolyte was 1.28%.
Similar results were obtained at 0.64% and 1.92%.

[0014]

[Table 1]

As is clear from FIG. 1, in the conventional example, mixing for 200 minutes or more is required to reach a predetermined gel viscosity, whereas in Examples 1 to 5, mixing for a shorter time is required. To reach a predetermined gel viscosity. In particular, Example 1
~ 4 (that is, when the amount of the alkaline electrolyte during pre-swelling is 51%, 38%, 26%, and 13% of the total amount),
A predetermined gel viscosity is reached by mixing within 50 minutes (that is, mixing for a short time of 1/4 or less of the conventional example).

[0016]

As described above, according to the present invention,
A swelling liquid is prepared by mixing the superabsorbent resin and the alkaline electrolyte, and a mixture is prepared by mixing the zinc powder, the gelling agent and the alkaline electrolyte, and then the swelling liquid and the mixture are mixed. The gelled negative electrode was manufactured in such a manner that the superabsorbent resin swells in advance, so that the mixing time does not need to be extended during the production of the gelled negative electrode. It is possible to provide a method for producing a gelled negative electrode for an alkaline battery, which can shorten the mixing time even if is used.

When the amount of the alkaline electrolyte contained in the swelling liquid is configured to be 13 to 51% of the total amount of the alkaline electrolyte, the mixing time required to reach a predetermined gel viscosity is determined by the conventional method. The mixing time can be remarkably reduced, for example, it can be reduced to 1/4 or less as compared with the case.

[Brief description of the drawings]

FIG. 1 is a graph showing a change in gel viscosity with mixing time.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Akihide Izumi 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (56) References JP-A-59-42778 (JP, A) JP-A JP-A-50-31326 (JP, A) JP-A-50-31327 (JP, A)

Claims (2)

(57) [Claims] 1. A swelling liquid is prepared by mixing a super water-absorbent resin and an alkaline electrolyte, and a mixture is prepared by mixing zinc powder, a gelling agent and an alkaline electrolyte. A method for producing a gelled negative electrode for an alkaline battery, wherein the mixture is mixed with a mixture to produce a gelled negative electrode. 2. The method for producing a gelled negative electrode for an alkaline battery according to claim 1, wherein the amount of the alkaline electrolyte contained in the swelling liquid is 13 to 51% of the total amount of the alkaline electrolyte.