DE386321C - Process for the production of collector electrodes - Google Patents

Description

GERMAN EMPIRE

ISSUED AL 7th DECEMBER 1923

REICH PATENT OFFICE

PATENT LETTERING

- JVe 386321 - CLASS 21b GROUP 17

(W60485 VIIIJ21 P)

Hugo Gari Wagner in Philadelphia. Process for the production of collector electrodes. Patented in the German Empire on February 15, 1922.

According to the Union Treaty of June 2, 1911, priority is due to this application of the application in the United States of America dated December 27, 1921.

It is well known that the type of accumulator has lead plates or lead grids for the negative and positive elements in the dilute sulfuric acid absorbing Containers are used, heavy, large and

difficult to handle. In addition, the diluted sulfuric acid can easily splash and for this reason the accumulator must be handled carefully or carefully be locked. Next is that

The entire construction and the replenishment are costly in view of the service life.

The purpose of the invention is to create a material which is easy to manufacture negative and positive collector electrodes can be used.

Another purpose of the invention is to manufacture this material in such a way that it weight is significantly lighter than the lead plates or used in ίο batteries up to now Lattice, the material conveniently being shaped into any desired shape can.

The material is porous, so when used in an accumulator it has a large Amount of sulfuric acid absorbed so that the free electrolyte space can be almost completely eliminated.

Finally, it is still a privilege of the new material to be seen in that it has a longer life has revealed itself as lead plates or grids and is also effective in the production and accumulation of electricity, as Before Using by the \ ^T.

In the drawing, the new material is in different phases of its production shown, and it show:

Fig. Ι to 8 schematic views of various Phases in the production of the material for positive and negative electrodes.

To produce the material for positive electrodes, wood particles 17 (Fig. 1), e.g. B. sawdust, soaked in a solution of ammonium sulfate until the individual wood particles are completely saturated with the solution and swollen to an extent that is larger than originally (Fig. 2), whereupon the wood is placed on a suitable device so that any excess ammonium sulfate can drain off. After draining, the wood, if it is still in the swollen state, is coated with one of the positive, active material, e.g. B. Red lead 18, rolled or mixed. This process is carried out until the surface of the wood particles is completely covered with red lead (Fig. 3). The soaked wood covered in this way is then rolled in carbon 19 until the particles are completely coated with carbon (Fig. 4), whereupon this free-flowing in calcined plaster of paris 20 is rolled or rolled (Fig. 5). The whole mass obtained can be shaped in any way; the hardening and setting of the mass depends on the amount of calcined gypsum and ammonium sulphate, the wood remaining in its swollen state. After "the mass has been shaped in the desired manner in the form of a positive electrode, it is placed in a drying room at a temperature of about 120 ^° C. until all the moisture has been driven out. At this stage the material is very porous, since the Wood particles have shrunk to their original volume (Fig. 6). After this drying process, the material is placed in a suitable container in which sulfuric acid, expediently with a specific gravity of 1.2, is, and the mass remains in this container until All the wood has been destroyed (Fig. 7). This makes the material ready for ■ use as a positive electrode. The ammonium sulfate solution has a specific gravity of 1.142. Fig. 8 shows two particles that have been bonded together during the process .

The same process is used to make negative elements, except that here, for the active material, it is appropriate to use black lead or lead dust.

Claims (1)

Patent claim: Process for the production of collector electrodes, characterized in that, that wood particles, expediently sawdust, saturated with an ammonium sulfate solution the swollen mass thus obtained with active material (powdered lead peroxide for positive and powdered metallic lead for negative electrodes), then a layer of carbon is applied to it, and finally the whole thing embedded in calcined plaster and shaped appropriately whereupon after the solidification of the electrodes formed in this way and the return to drying with heating leading to shrinkage of the wood by immersing the electrode in acid, z. B. sulfuric acid, is completely destroyed. HJerzu 1 sheet of drawings.