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Zinc-air cell air diffusion electrode pore-forming method and its pore-forming agent

A zinc-air battery and air diffusion technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of air diffusion electrode appearance and internal structure damage, damage to air diffusion electrode quality and performance, and high average cost of electrodes , to achieve the effect of easy control of size and distribution, uniform size and low average cost

Inactive Publication Date: 2004-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. During the pore-forming process of boiling and reflux extraction, high-temperature distilled water or acid solution will damage the appearance and internal structure of the air diffusion electrode to a certain extent; after boiling the pore-forming process, the membrane size in the air diffusion electrode will shrink or The bonded structure of the membrane and the current collector is partially peeled off, thereby impairing the quality and performance of the air diffusion electrode, resulting in a low pass rate of the electrode and a high average cost of a single electrode

Method used

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  • Zinc-air cell air diffusion electrode pore-forming method and its pore-forming agent
  • Zinc-air cell air diffusion electrode pore-forming method and its pore-forming agent
  • Zinc-air cell air diffusion electrode pore-forming method and its pore-forming agent

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Effect test

Embodiment 1

[0044] 16wt% carbon black, 16wt% acetylene black, 32wt% catalyst, 32wt% (to solid content) binder, 4wt% pore-forming agent ammonium oxalate etc. are mixed with an appropriate amount of dispersant ethanol, Heat and stir at 50°C until a paste is formed, and then roll-form it to obtain a catalytic membrane. Mix 30wt% acetylene black, 66wt% (to solid content) binder, 4wt% pore-forming agent ammonium oxalate, etc., with an appropriate amount of dispersant ethanol, heat and stir at 50°C until a paste is formed Roll forming to obtain a waterproof and breathable membrane. According to the sequence of catalytic membrane, waterproof breathable membrane and foamed nickel alloy current collector from inside to outside, the three are laminated and rolled into a cylindrical air diffusion electrode. The air diffusion electrode was dried at 70°C for 30 min, and the thermal decomposition method was used to make pores.

[0045] The catalyst used is LiMn with spinel crystal structure 1.99 co ...

Embodiment 2

[0048] 12wt% carbon black, 12wt% acetylene black, 25wt% catalyst, 25wt% (to solid content) binding agent, 26wt% pore-forming agent ammonium bicarbonate etc. are mixed with an appropriate amount of dispersant ethanol, Heat and stir at 70°C until a paste is formed, and then roll-form it to obtain a catalytic membrane. Mix 25wt% acetylene black, 50wt% (relative to solid content) binder, 25wt% pore-forming agent ammonium bicarbonate, etc., with an appropriate amount of dispersant ethanol, heat and stir at 70°C until a paste is formed Press molding to obtain a waterproof and breathable membrane. According to the sequence of catalytic membrane, waterproof breathable membrane and nickel mesh current collector from the inside to the outside, the three are laminated and rolled into a cylindrical air diffusion electrode. The air diffusion electrode was dried at 250°C for 5 minutes, and the thermal decomposition method was used to make pores.

[0049] The catalyst used is LiMn with spi...

Embodiment 3

[0052] 13wt% carbon black, 13wt% acetylene black, 26wt% catalyzer, 26wt% (to solid content) binding agent, 22wt% pore-forming agent ammonium carbonate etc. are mixed with an appropriate amount of dispersant ethanol, at 55 Heating and stirring at ℃ until a paste is formed, and then roll forming to obtain a catalytic membrane. Mix 26wt% acetylene black, 55wt% (relative to solid content) binder, 19wt% pore-forming agent ammonium carbonate, etc., with an appropriate amount of dispersant ethanol, heat and stir at 55°C until a paste is formed, then roll-press Molded to obtain a waterproof and breathable membrane. According to the sequence of catalytic membrane, waterproof breathable membrane and foamed nickel current collector from inside to outside, the three are laminated and rolled into a cylindrical air diffusion electrode. The air diffusion electrode was dried at 110° C. for 25 minutes, and the thermal decomposition method was used to make pores.

[0053] The catalyst used is...

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Abstract

Pore creating material is added to waterproof-breathe freely membrane and catalyse membrane air diffusion pole of zinc air cell. Heating 5-30min under 70-250 deg.C makes thermal decomposition or thermal degradation of pore creating material so as to carry out pore creating for waterproof-breathe freely membrane and catalyse membrane. The pore creating material is carbowax, organic ammonium salt or compound of inorganic ammonium salt. The invention raises quality and discharging current density of air diffusion pole, and raises electrical property of zinc air cell.

Description

1. Technical field [0001] The invention relates to a thermal decomposition pore-making method and a pore-forming agent, which are suitable for the pore-making process of an air diffusion electrode of a zinc-air battery. It belongs to the field of chemical power sources. 2. Background technology [0002] A zinc-air battery uses zinc as the negative active material and oxygen in the air as the positive active material. Under the catalysis of the electrocatalyst, the active materials of the two electrodes undergo a chemical reaction to generate electrical energy. Taking the commonly used alkaline zinc-air battery as an example, the electrode reaction and battery reaction are expressed as follows: [0003] Positive reaction <chemistry num="001"> <chem file="03147019_cml001.xml" / > < / chemistry> [0004] Negative reaction <chemistry num="002"> <chem file="03147019_cml002.xml" / > < / chemistry> [0005] batter...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 周震涛王刚
Owner SOUTH CHINA UNIV OF TECH
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