Multi-layer composite cathode of metal-air battery

A metal-air battery and multi-layer composite technology, which is applied to battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as sweating, current collector corrosion, and affecting battery life, so as to reduce corrosion, improve performance, and prolong battery life. The effect of service life

Inactive Publication Date: 2013-12-25
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

However, the air cathode with this structure still exists during use. When the electrode is used for a long time, the nickel foam surface of the electrode will appear "sweating", which will cause corrosion of the current collector and affect the service life of the battery;

Method used

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  • Multi-layer composite cathode of metal-air battery
  • Multi-layer composite cathode of metal-air battery
  • Multi-layer composite cathode of metal-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The multi-layer composite cathode for a metal-air battery in the invention includes a catalytic layer, a hydrophobic diffusion layer and a current-collecting layer.

[0022] The current collector layer is made of nickel foam current collector with a thickness of 3mm and an anti-corrosion layer coated on one side of the surface. The anti-corrosion layer is made of hydrophobic material PTFE and carbon material XC-72 with a mass ratio of 3:7 to 50 times XC- 72 mass of ethanol solvent, mixed evenly, and then coated on the surface of the current collector on one side of the foamed nickel to prepare an anti-corrosion layer with a thickness of 1 mm.

[0023] The hydrophobic diffusion layer is a carbon fiber felt after the hydrophobic treatment of the PTFE emulsion; the original thickness of the carbon fiber felt is 3.5mm; PTFE accounts for 60% of the total mass of the hydrophobic diffusion layer.

[0024] The catalytic layer is made of 60%MnO 2 / C is a catalyst, PTFE is a hyd...

Embodiment 2

[0027] The multi-layer composite cathode for a metal-air battery in the invention includes a catalytic layer, a hydrophobic diffusion layer and a current-collecting layer.

[0028] The current collector layer is composed of foamed copper current collector with a thickness of 3mm and an anti-corrosion layer coated on one side of the surface. The thickness of the anti-corrosion layer is 1mm; It is prepared by mixing evenly in an ethanol solvent with the mass of carbon nanofibers and then coating on the surface of the current collector on both sides of the nickel foam.

[0029] The hydrophobic diffusion layer is a carbon fiber felt after the hydrophobic treatment of the PTFE emulsion; the original thickness of the carbon fiber felt is 10mm; PTFE accounts for 60% of the total mass of the hydrophobic diffusion layer.

[0030] The catalytic layer is made of 40%Mn 3 o 4 / C is a catalyst, PTFE is a hydrophobic agent; 40%Mn in the catalytic layer 3 o 4 The loading capacity of / C is...

Embodiment 3

[0033] The multi-layer composite cathode for a metal-air battery in the invention includes a catalytic layer, a hydrophobic diffusion layer and a current-collecting layer.

[0034] The current collecting layer is composed of a nickel mesh current collector with a thickness of 0.5mm and an anti-corrosion layer coated on the surface of both sides, and the thickness of the anti-corrosion layer on each side surface is 1mm; the anti-corrosion layer is composed of a hydrophobic material with a mass ratio of 9:1 PTFE and carbon nanotubes are mixed uniformly in an ethanol solvent with 50 times the mass of carbon nanotubes, and then coated on both sides of the nickel mesh.

[0035] The hydrophobic diffusion layer is a carbon fiber felt after the hydrophobic treatment of the PTFE emulsion; the original thickness of the carbon fiber felt is 3.5 mm; PTFE accounts for 60% of the total mass of the hydrophobic diffusion layer.

[0036] The catalytic layer is 40%Mn with a mass ratio of 1:1 3...

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Abstract

The invention discloses a multi-layer composite cathode of a metal-air battery, which comprises a catalyst layer, a drain diffusion layer and a current collecting layer, wherein the current collecting layer comprises a current collecting body, and an erosion resistant coating(s) which is coated on one side or two sides of the current collecting body; each erosion resistant coating is made from a drain material and a carbon material according to the mass ratio of (30:70)-(90:10); the thickness ratio of each erosion resistant coating to the current collecting body is (1:10)-(2:1). According to the multi-layer composite cathode disclosed by the invention, the drain treatment on the surface of the current collecting body is good for reducing the leakage of an electrolyte solution, and further relieving the erosion of the electrolyte solution to a metal current collecting mesh; a porous structure within a certain scale range is formed in the current collecting body of the battery due to the addition of carbon powder, the transport of air is facilitated, oxygen supply to the battery cathode is ensured, the increase of resistance due to the addition of other erosion resistant materials can be avoided, and the current collecting effect is ensured.

Description

technical field [0001] The invention relates to a cathode for metal-air batteries, in particular to a cathode for metal-air batteries such as magnesium, aluminum, and zinc; [0002] The present invention also relates to a method for preparing the above-mentioned cathode. Background technique [0003] A metal-air battery is an electrochemical reaction device that uses metal (such as magnesium, aluminum, zinc, etc.) as the anode fuel, oxygen in the air as the oxidant, and lye or neutral brine as the electrolyte solution. my country's magnesium, aluminum, zinc and other metals are abundant in reserves and low in price. Therefore, metal-air batteries have broad application prospects in many fields of mobile power sources such as communication power sources, field emergency power sources, lighting power sources, and reserve power sources. As a mobile power source, performance and stability are two important indicators. For metal-air batteries, the cathode is one of the importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/66
CPCY02E60/10Y02E60/50
Inventor 孙公权王二东舒朝著谷顺学
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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