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Composite gas diffusion electrode and battery

A technology of gas diffusion electrode and diffusion electrode, which is applied in the field of electrochemistry, can solve the problems of reducing battery water exchange, battery performance degradation, and reducing oxygen transmission capacity, so as to achieve the effect of reducing exchange transmission and prolonging discharge time

Inactive Publication Date: 2021-05-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduce the pore size of the gas diffusion electrode, but the reduction of the pore size not only reduces the water exchange inside and outside the battery, but also reduces the transmission capacity of oxygen, resulting in insufficient supply of the battery reaction gas and a decrease in battery performance; improving the hydrophobicity of the gas diffusion electrode, Can control the transport of liquid water, but has no effect on gaseous water molecules

Method used

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  • Composite gas diffusion electrode and battery
  • Composite gas diffusion electrode and battery
  • Composite gas diffusion electrode and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] One embodiment of the present invention, such as figure 1 As shown, the composite gas diffusion electrode is sequentially provided with a separation membrane layer 4, a diffusion layer 3, a current collecting layer 2 and a catalytic layer 1 from outside to inside; another embodiment of the present invention, such as figure 2 As shown, the composite gas diffusion electrode is provided with a separation membrane layer 4, a diffusion layer 3, a catalytic layer 1 and a current collecting layer 2 in sequence from outside to inside.

[0033] The separation membrane layer 4 is composed of at least one of membrane polymer and membrane-forming inorganic material, wherein the membrane polymer is one of polyolefin, polysulfone, polyamide, polyester, silicon-containing polymer, and fluorine-containing polymer or two or more, the film-forming inorganic materials are Pd and its alloys, SiO 2 、Al 2 o 3 、TiO 2 , ZrO 2 , molecular sieve, graphene, carbon nanotube or more than one....

Embodiment 1

[0047] Take a 3cm×3cm gas diffusion electrode, place the diffusion layer upward. Glucose, nitrogen methylpyrrolidone, polyethersulfone, and molecular sieves were heated at 60°C in a mass ratio of 4:70:20:6, completely dissolved, and degassed at constant temperature to obtain a casting solution. Use a brush to brush the casting solution on the surface of the gas diffusion electrode, and the loading of the casting solution is 0-25mg / cm 2 . After coating, the electrode was dried at 40° C. for 24 hours to obtain a gas diffusion electrode with a composite polysulfone-molecular sieve membrane.

[0048] A moisture-permeable cup was used to test the performance of the composite gas diffusion electrode against water vapor penetration, and the results were as follows Figure 4 As shown, the membrane loads of samples in groups A, B, C, and D were 18.8 mg / cm 2 、23.7mg / cm 2 , 14.4mg / cm 2 , 5.6mg / cm 2 , at a membrane loading of 18.8mg / cm 2 (Group A samples), the water vapor transport...

Embodiment 2

[0052] Take a 3cm×3cm gas diffusion electrode, place the diffusion layer upward. Glucose, nitrogen-methylpyrrolidone, and polyethersulfone are heated at 60°C in a mass ratio of 4:70:20:6, and after they are completely dissolved, they are degassed at a constant temperature to obtain a casting solution. Use a brush to brush the casting solution on the surface of the gas diffusion electrode, and the casting solution load is 20mg / cm 2 . After coating, the electrode was dried at 40° C. for 24 hours to obtain a gas diffusion electrode with a composite polysulfone membrane. Experiments show that the water vapor transmission performance of the composite gas diffusion electrode obtained in this example is reduced to 85% of that of the air electrode of the comparative example, and the oxygen transmission performance of the composite gas diffusion electrode is reduced to 28% of that of the air electrode of the comparative example.

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Abstract

The invention discloses a composite gas diffusion electrode and a battery. The composite gas diffusion electrode comprises a gas diffusion electrode and a separation membrane layer, wherein the separation membrane layer is attached to the surface of the gas diffusion electrode and used for blocking exchange of water molecules inside and outside the gas diffusion electrode. The separation membrane layer with oxygen permeation and water blocking functions is attached to the surface of the gas diffusion electrode, so that exchange transmission of water vapor inside and outside the electrode is greatly reduced under the condition of ensuring sufficient oxygen transmission capability, the discharge time of the battery is prolonged, and the problem that the performance of an existing metal-air battery is reduced due to the fact that water in the electrolyte is too much or too little due to water exchange between the electrolyte and the outside is solved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite gas diffusion electrode and a battery. Background technique [0002] Gas diffusion electrode (Gas diffusion electrode) is a high-efficiency oxygen reduction electrode. Since a large amount of gas can reach the inside of the electrode and communicate with the overall solution (electrolyte) inside the electrode, it can form a three-phase (solid, liquid, gas) In the reaction area, its unique solid-liquid-gas three-phase porous structure can promote the occurrence of oxygen reduction reaction. With the development of electrochemical technology, gas diffusion electrodes have been widely used in the field of electric energy, such as metal / air batteries, fuel cells, etc. [0003] In a metal-air battery, the air electrode is responsible for oxygen diffusion, oxygen reduction, and blocking electrolyte leakage, which makes the metal-air battery a semi-open...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M12/06
CPCH01M4/8605H01M4/8657H01M12/06
Inventor 王二东燕召孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI