JPS597404A - Rolling method of metallic lithium - Google Patents

Abstract

PURPOSE:To enable rolling of metallic Li having an extra thin wall thickness with close dimensions by using a roll which consists of a sintered material having specific porosity as a roll material wherein the hexane injected in the central part thereof seeps on the surface and wets the same. CONSTITUTION:Hexane is supplied from a hexane supplier which is mounted in the axial direction of a centrally thick walled pipe 1 and consists of a hexane reservoir 6, a regulator 7 for the flow rate of the liquid to be transported, and a pipe 8 for transporting the liquid into said pipe. A roll 1 is supported by means of bearings 11, and is driven by a driver shaft 10. A sintered body 3 of Hoganas iron powder provided in the outside of the pipe 1 has 15-30% porsity and the hexane supplied in the pipe seeps on the surface of the sintered body layer 3 from perforated parts 2 thus wetting the surface.

Description

[Detailed description of the invention] The present invention relates to a method for rolling metallic lithium.

When trying to use metallic lithium as a starting element for a small-sized Kameike, it is necessary to first finish the metal into a ribbon shape of a fixed size.
It is obvious that it is desirable to cut or pull out the metal lithium before use, but if you try to roll metallic lithium into a ribbon, moisture in the air will adhere to the lithium surface, producing lithium hydroxide, which will cause the roll to stick. , Delicious (not good)

High-quality white petrolatum is often used to prevent this sticking, but petrolatum has poor wettability and is not uniformly supplied onto the rolls during rolling. - Lyserine bites into the lithium surface and is easily removed Can not. Therefore, the quality of the finished metal lithium ribbon is sacrificed to some extent.

Perhaps for this reason, the so-called T-die method is being considered, but although thick materials may be possible with the T-die method, it is not possible to manufacture each Kashihara material desired for lithium battery materials with precise dimensions according to each individual request. Not only is it difficult, but it is also extremely difficult to achieve extremely thin walls.

On the other hand, if hexane is used for the same purpose, no trouble will occur as long as only the moisture content in hexane is taken care of. However, it is quite troublesome to uniformly supply a sufficient amount of hexane to the roll surface during roll rolling. The object of the present invention is to enable rolling of metallic lithium to be carried out automatically and continuously without problems such as sticking, and without wasting hexane. Depending on the method, it is possible to give the rolled surface an extremely microscopic uneven surface, which has the advantage of contributing to imparting activity as a power generation element and improving grip on the conductive material. You can create a sintered material with an appropriate porosity and a hollow center, and then polish the surface and finish it into a roll material.
This is made possible by using a hexane supply roll, and the method for manufacturing and using the roll is shown below.

As shown in FIG.
A plurality of holes 2 with a diameter of 2 mm to 5 mm are made, and a material 4 made of foamed styrene, polyethylene, or the like is inserted into the tube 1 with a medium diameter of 2 to 5 mm, and the portion blown out from the holes is removed.

Next, apply a mixture of 10 to 300 menonyu (sigma) of Höganäs iron powder and 2 to 5'% by weight of acetic acid vinyl paste (6), or pack it using a split mold. come. After sufficiently solidifying, pre-baking is performed slowly at up to 400°C to incinerate or dissipate the acetic acid vinyl paste and the foam material in the center tube, and then sinter the Höganäs iron powder in a reducing atmosphere at 700-900°C. .

After sintering, surface grinding, roundness, etc. are performed to finish it into a roll. FIG. 2 is a cross-sectional view of the main parts of the rolling equipment used in the present invention, in which hexane is supplied with a stand 9 attached in the axial direction of the central thick-walled tube 1, a hexane reservoir, and a transportation liquid volume adjustment device 7.
, is supplied into the pipe from a hexane supplier consisting of a liquid volume transport pipe 8. The roll is supported on bearings 11 and driven by a driver shaft 10. The amount of hexane seeping onto the roll surface can be reduced to just the extent that the roll surface is wet.

As a result of rolling lithium materials using the rolling equipment described above, the rolled lithium material does not suffer from phenomena such as sticking after long periods of use, and has a glossy rolled lithium surface with appropriate unevenness or no unevenness at all. This is an excellent method for producing lithium foil or ribbon for batteries.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the roll used in the present invention before sintering;
The figure is a sectional view of the main parts of a rolling device used in the present invention.

Claims (1)

[Claims] A sintered material with a porosity of 15 to 30% is used as a roll material, and hexane injected into the center of the material is leached onto the surface of the sintered material roll and rolled using a roll that moistens the surface. A metal lithium rolling method characterized by: