JPS5875773A - Air electrode - Google Patents

Abstract

PURPOSE:To achieve a tubular or a rectangular air electrode having high mechanical strength, liquid tightness and the excellent liquid-proof performance, bybending or folding a pressure contacted three-layer structure then welding and jointing the current collector layer at the heavy portion while mending the defective portion at the joint with perphloro-alkoxy resin. CONSTITUTION:It is made of a three layer structure sheet of a water repellent layer, porous catalytic layer and a current collecting layer laminated and pressed in thid order, where said sheet is bent or folded such that the current collecting layer will come to the inside while the water repellent layer will come to the outside then a portion of both ends of th sheet is ovelapped to produce a cylinder. Thereafter the exposed current collecting layer except a portion of the water repellent layer and the porous catalytic layer at the overlapped section is welded by a welder. Then a fluororesin is filled at the defective section not at the liquid-tight state thus to mend luquid-tightly. Perphloro-alkoxy resin is preferable as the fluororesin then the filled section is heated to the fusing temperature of the resin and cooled as it is to be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical or rectangular cylindrical air electrode, and more particularly to a 9-cylindrical air electrode that has high mechanical strength (and excellent leakage resistance).

Which cylindrical air battery O electrode is LR-1 or LR-141?
Sheet-like three-layer structure [, scissors current collector body O
The layer is curved inward and shaped like a cylinder, and both ends of the cylinder are adhered with an adhesive such as Eclipse/A or Nyxy resin to form a liquid-tight cylindrical electrode.

Here, as a water repellent layer, generally %I Litetra 7W5U
Ethylene, 4 liters 744 ethylene - life t) vx
a f a pyrene copolymer, f polyethylene-tetra 7a
(a) Ethylene copolymer surface may be any fluororesin, #family such as l-carbonate prepylene, etc., for example, its particle size Ql ~ 4011t)
Powder*0＠Pongee body, fibers are heated and made into non-woven fabric and made into paper-like material.
)%0. Also available in woven fabric and film form.
A porous sheet with oxygen gas permeability is used.

9. The porous catalyst layer is coated with nickel tungstic acid, palladium and cobalt with low oxygen reduction overvoltage, and is coated with 9-tundastene carbide, nickel, silver, platinum, palladium, etc. catalyst TA1 and activated carbon powder is coated with activated carbon powder %4 LITETRA7.
It is formed by integrating with a porous metal body, a porous body, and a fiber-free fabric using leroethylene cape as a binder.

Recently, construction work has begun on this dormitory, in order to improve work efficiency.
A sheet made of a hot-melt adhesive such as polyethylene, I-lyethylene-vinyl acetate copolymer, boriamide, boriinobutylene, etc. is applied to the joints on both sides of the T-3 layer structure, and ζζ is pressed while heating to about 250°C. The onomatopoeia method has also been attempted.

However, in any method, the adhesive or hot-melt adhesive sheet must be attached to the above-mentioned 1kIl aqueous layer, but these aqueous layers are mainly composed of fluororesin. Although it is larger, its adhesion effect is extremely low.

Therefore, the strength of the second threat part Ctg- is small).

Disperse the electrolyte in a liquid electrolyte and add the cathode mixture to the electrode.

The present invention eliminates the above-mentioned drawbacks, and is molded from a sheet of three-layer structure, and has high mechanical strength at the welded part of the nine-cylindrical body.Furthermore, it is completely sealed and has excellent leakage resistance. The provision of cylindrical or prismatic air electrodes shall be considered.

The air electrode of the present invention consists of a water-repellent layer having a permeability for hydrogen gas, a porous catalyst layer having an ability to reduce oxygen gas, and a current collector layer, and these three layers are laminated in this order and bonded together. Structure Sheet) 1- Curved or folded into a predetermined shape with the current collector layer 0 inside, the both ends of the sheet are partially overlapped, and the cylindrical or square structure has a 1m overlapped part. The cylindrical body of the cylinder, the current collector 0 layer in the wrinkle superimposed part [welded and joined,
The amount of defective parts in the aqueous layer and the porous catalyst layer kA-79g in the Mukurohatakai sK;
II! # Make it a statue.

The air electrode of the present invention includes a male, a water repellent layer, a porous catalyst layer,
The current collector layers are laminated in this order and pressed together to produce a three-layer structure sheet. The water-repellent layer is an oxygen-permeable O sheet made of I-liter rough 0 ethylene, I-lig trough 0 roethylene-hexafucho-zelen co-111, polyethylene-tetraflow ethylene copolymer, /17 f lobirene, etc. was used, and the porous catalyst layer was 1 day gold irises Δradium till manganese dioxide;
Activated carbon; nickel tungstic acid, d radium e; tungsten carbide coated with nord, nickel, silver, platinum, delta radium. A porous sheet is used. The current collector layer may be, for example, a nickel O wire mesh, a thin plate of Δ-antched metal, or a thin plate of Δ-antiated metal.

The current collector O layer of this three-layer structure is arranged on the circular side, that is, the aqueous layer is on the outside, and the patterned sheet is curved (cylindrical electrode) or bent (prismatic cylindrical electrode). Part of both ends are overlapped to form a cylinder. Next, the overlapping portion of the aqueous layer and porous catalyst layer is removed, and the exposed current collector layer is heated by spot welding, beam welding, Rede welding, or other layer twisting means. 9. For pigeon houses in which the current collector layer is exposed from the beginning, the conditions should be adjusted accordingly.

Therefore, the inside and outside of the cylinder are not in a liquid-tight state because they are connected at the overlapping part.

In the electrode of the present invention, the above-mentioned defective portion which is not in the IFO state is filled with a seven-layer resin to repair the defective portion in a liquid-tight manner.

Book! As a fluororesin used in II Ming, Isu Δ-7W
a basket noflorme F xipenkun, 19 arms - 7″*aN
70 ethoxyhexynane, I 70 roy 70 ru f
atlhequinane, - river fluoromono 2) * sz to medium naan, borina mother - 70 logif p purpentyl hequinane y, etc.
Takemoto I! I/#-70-alkoxy resin having a 7-alkyl group of 1 to i as a side chain, Epotetra-70-ethylene (PTF), I97 fluoroethylene, 4-67-fluoroethylene f12♂ lene t Among these, 0111 has excellent kinetics in the molten state (31
The viscosity at 2°C = 2°6 x 10 dI), the film formed after cooling is uniform, and the shearing modulus at 113°C is 6700 b/aJ (3000 to soo in the case of FTFIO).

q/-) and its high mechanical strength, the cy/9-7 4-alkoxy tree is preferable to the nail shape.

Also, in this purful tetraalkoxy tree IN, I
A-70 Russian tetraethoxyhexane is preferably used from the viewpoint of its O properties and workability.

These fluororesins are powdered when used as a power supply, but this powder is filled into the missing parts of the current collector layer tS*t, the O porous catalyst layer, and the water repellent layer, and then this part is filled with the resin. The melting temperature f
Heat it up to melt it, then do it! It is cooled and fixed, and the defective part is repaired in a liquid-tight manner.

In the air electrode of the present invention, the mechanical strength is increased by welding the layers of the current collector, and the mechanical strength of the overlapping portion is increased.
Type II is useful because the fluororesin is liquid-tightly filled with *-tS, and its mechanical strength and leakage resistance are improved as a whole.

The present invention will be explained below based on examples.

Example: A PTFE film with a thickness of 100μ with an average pore diameter of 10 sO* pores distributed in situ as a water-repellent layer.Activated carbon powder with an average particle diameter of 100 mm supported on 5 weight of platinum as a porous catalyst layer. The resulting mixed powder was mixed with a suitable amount of PTFIC powder, and the resulting mixed powder was rolled in a normal arc to form a film with a thickness of 0.5 mm and a layer of 0.1 mm as a current collector layer. I prepared a nickel wire mesh made of 40 mesh.

These are stacked in the order shown above and the total weight is t-1 ton.
It was pressed at /-0 pressure to form an electrode sheet.

Approximately 2cm on both sides of the nine sheets obtained! I PTFE
After cutting and removing the film and the catalyst layer film, a cylinder was formed with the nickel wire mesh on the inside, and the overlapped nickel wire mesh portions 1i-jC/twell were welded.

Fill the defective part with powder of I'4A-furopsifal ethoxy hequinane with an average particle size of 1!35μ to a thickness of about 1.4μ, and heat this part to 1320°C. / River 7a Russia 0 The ethoxyhexane melts well.

The resin layer was cooled in a trench to form a resin layer with a thickness of about 0.7 mm.

The nine cylindrical electrodes obtained were designated as sample 1.

Next, a cylindrical electrode was formed in the same manner as in Sample 14D, except that the defective part was filled with PTFΣ powder with an average particle size of 5G*0 to a thickness of about 5.4 parts, and the part was heated to 340°C. A tube was made. This was designated as sample 2.

9, Sample 1, Sample 20 (11) Used on both sides of the friend electrode sheet (ell) #, put the parts together, and put a sheet of hot melt adhesive made of polyethylene and a sheet of PTFW on that part. A cylindrical battery was prepared by applying the composite sheet to the hot melt adhesive so that it was in contact with the hot melt adhesive, and heating and pressing the whole body at 200°C and 310 (It/j). 1.2 is the electrode of the present invention, and sample 3 is a conventional electrode.

For each of these three types of Ili cylindrical electrodes, 5 *Tensile strength of the joint part) Each 5oar battery was prepared and stored for one year at room temperature (T S° C.), and the electrolysis #0 leakage rate CLs)k was in good condition.

The above results are shown in the table as average values for each battery.

Claims (1)

[Claims] Consists of a water repellent layer having an oxygen gas permeability of 1, a porous catalyst layer having an oxygen gas reducing ability, and a current collector layer.
A sheet of a 93-layer structure is laminated and crimped in the OIt order (curved or folded into a predetermined shape with the current collector layer on the circular side), and the both sides of the sheet O are partially overlapped, The body is a cylindrical cylinder, a forked square cylinder, and a cylindrical body with a t-chained nine structure. The overlapping part Owi current collector O layer is joined in contact with #1, and the defective part of the water-rich layer and the axillary porous catalyst layer at the joint part [, Part W] is repaired with tetraalkoxy resin.
t and wa air electrode.