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Metal-air battery cathode and preparation method thereof

A metal-air battery and air cathode technology, which is applied to battery electrodes, fuel cell half-cells, primary battery-type half-cells, circuits, etc., can solve the problems of easy corrosion of nickel foam, leakage of electrolyte, and increased service life And other issues

Active Publication Date: 2021-09-14
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

[0004] The traditional metal-air electrode cathode preparation method is to mechanically press a multilayer composite structure (generally composed of a hydrophobic diffusion layer-nickel mesh-catalytic layer formed by mixing and pressing carbon powder and PTFE). Electrodes prepared by this method Large structural polarization, poor hydrophobicity, easy electrolyte leakage, and foamed nickel is easy to be corroded
These problems have become the key issues restricting the improvement of electrode performance and the growth of service life.

Method used

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  • Metal-air battery cathode and preparation method thereof
  • Metal-air battery cathode and preparation method thereof
  • Metal-air battery cathode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of current-collecting layer: 30% PTFE emulsion 5.3g of water-repellent agent is mixed with acetylene black 0.4g, and then 2ml of ethanol is added and stirred evenly to obtain carbon powder / hydrophobic agent mixed paste, and the paste is scraped into nickel foam to obtain Collector layer, dry the collector layer at 25°C, and bake at 340°C for 1h; the filling amount of the carbon powder / hydrophobic agent mixed paste in the metal foam is 0.2mg / mm 3 ; The mass ratio of carbon powder and hydrophobic agent in the mixed paste is 1:4, first mixing the hydrophobic agent with carbon powder is to make the hydrophobic agent disperse more evenly, and to prevent the hydrophobic agent from agglomerating after directly adding the solvent .

[0038](2) Preparation of the catalytic layer: roll-press 60% PTFE emulsion 50g of hydrophobic agent and 180g slurry of Ag-MnOx / C catalyst into a catalytic layer by rolling method; and bake the catalytic layer at 350°C for 24h, The ...

Embodiment 2

[0042] (1) Preparation of current-collecting layer: Mix 4.0 g of hydrophobic agent 30% PTFE emulsion with 0.8 g of acetylene black, add 2 mL of ethanol solvent, stir evenly to obtain a carbon powder / hydrophobic agent mixed paste, scrape or squeeze the paste To obtain a collector layer in nickel foam, dry the collector layer at 25°C and bake at 340°C for 1h, the filling amount of the carbon powder / hydrophobic agent mixed paste in the metal foam is 0.5mg / mm 3 The mass ratio of the carbon powder and the hydrophobic agent in the mixed paste is 2:3; the hydrophobic agent is mixed with the carbon powder first in order to make the hydrophobic agent disperse more evenly, and to prevent the hydrophobic agent from agglomerating after directly adding the solvent .

[0043] (2) Preparation of the catalytic layer: roll-press 60% PTFE emulsion 250g of hydrophobic agent and 180g slurry of Ag-MnOx / C catalyst into catalytic layer by rolling method; and bake catalytic layer at 350°C for 24h, an...

Embodiment 3

[0048] (1) Preparation of current collecting layer: Add 2.3g of hydrophobic agent 30% PTFE emulsion and 1.3g of acetylene black into 2ml of ethanol solvent, stir evenly to obtain a mixed paste of carbon powder / hydrophobic agent, scrape or squeeze the paste until foam The collector layer was obtained in nickel, the collector layer was dried at 80°C for 1h, and fired at 340°C for 1h, and the filling amount of the carbon powder / hydrophobic agent mixed paste in the metal foam was 1.0mg / mm 3 The mass ratio of the carbon powder and the hydrophobic agent in the mixed paste is 1:2; the hydrophobic agent is first mixed with the carbon powder in order to make the hydrophobic agent disperse more evenly, and at the same time prevent the hydrophobic agent from agglomerating after directly adding the solvent .

[0049] (2) Preparation of catalytic layer: adopt roll pressing method to roll 1250g of 60% PTFE emulsion and Ag-MnOx catalyst 180g into catalytic layer; 0.5mg / mm 2 ;

[0050] (3)...

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Abstract

An air cathode of a metal-air battery, comprising a hydrophobic diffusion layer, a collector layer and a catalytic layer pressed sequentially, the collector layer is a metal foam uniformly filled with a mixture of carbon powder / hydrophobic agent, the present invention is compared with the prior art Compared with that, carbon powder and hydrophobic agent are filled into the foam metal gap to construct an air cathode with continuous and gradient distribution of hydrophobic agent, which slows down the leakage of electrolyte and reduces the corrosion of alkaline electrolyte on current collector. The catalytic layer slurry is rolled into a catalytic layer to reduce the shedding of the catalyst. The carbon fiber felt treated with PTFE hydrophobicity is used as the gas diffusion layer. The three parts of the entire electrode are hydrophobic to build a continuous hydrophobic structure with a concentration gradient. This structure is beneficial to the improvement of performance and service life, and at the same time, the method has the characteristics of simple preparation and mass production.

Description

technical field [0001] The invention belongs to the technical field of metal-air batteries, and relates to an air cathode for metal-air batteries, in particular to an air cathode for metal-air batteries used in alkaline electrolytes such as zinc and aluminum; [0002] The present invention also relates to a method for preparing the above-mentioned air cathode. Background technique [0003] A metal-air battery is an electrochemical reaction device that uses metal (such as zinc, aluminum, magnesium, etc.) as the anode fuel, oxygen in the air as the reducing material, and alkaline or neutral electrolyte as the electrolyte solution. my country's magnesium, aluminum, zinc and other metals are abundant and cheap, so metal-air batteries have broad application prospects in many fields such as emergency power supply, energy storage, mobile power supply, and reserve power supply. As power performance and stability are two important indicators. For metal-air batteries, the air cathod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/06
Inventor 王二东杜香龙孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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