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An air electrode of a lithium air battery and a preparation method thereof

A lithium-air battery and air electrode technology, which is applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc. Stabilizing performance, controlling reaction rate, inhibiting the effect of lithium peroxide disproportionation side reaction

Inactive Publication Date: 2018-12-25
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that in the currently widely used air electrode of lithium-air batteries, the catalyst easily causes side reactions to produce lithium oxide, resulting in excessive internal temperature of the battery and a decrease in cycle stability, the present invention proposes an air electrode for lithium-air batteries and a preparation method thereof , so as to effectively improve the stability of the battery

Method used

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  • An air electrode of a lithium air battery and a preparation method thereof

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Embodiment 1

[0031] The air electrode includes a hollow porous conductive substrate, a catalyst and a coating layer; the hollow conductive substrate is a cylinder, and its hollow part is used to connect an air compressor to facilitate the injection of air or oxygen; the material of the hollow conductive substrate is a conductive carbon-based material; the catalyst is CuFeN / C composite catalyst; the cladding layer is a perovskite ceramic-based oxygen ion conductor.

[0032] The preparation process is:

[0033] (1) Add copper phthalocyanine and iron phthalocyanine to anhydrous ethanol solvent to make a solution, put the carbon-based material as a conductive substrate in the solution system for a period of time, and then evaporate the ethanol solvent under the protection of argon. Take out the remaining carbon-based material for later use; the molar concentration of the solution is 7mol / L, and the molar ratio of copper phthalocyanine to iron phthalocyanine is 1:1; the soaking time is 2h;

[...

Embodiment 2

[0036] The air electrode includes a hollow porous conductive substrate, a catalyst and a coating layer; the hollow conductive substrate is a cylinder, and its hollow part is used to connect an air compressor to facilitate the injection of air or oxygen; the material of the hollow conductive substrate is a conductive carbon-based material; the catalyst is CuFeN / C composite catalyst; the cladding layer is a metal oxide type ceramic-based oxygen ion conductor.

[0037] The preparation process is:

[0038] (1) Add copper phthalocyanine and iron phthalocyanine to anhydrous ethanol solvent to make a solution, put the carbon-based material as a conductive substrate in the solution system for a period of time, and then evaporate the ethanol solvent under the protection of argon. Take out the remaining carbon-based material for later use; the molar concentration of the solution is 5mol / L, and the molar ratio of copper phthalocyanine to iron phthalocyanine is 1:1; soaking time is 1h;

...

Embodiment 3

[0041] The air electrode includes a hollow porous conductive substrate, a catalyst and a coating layer; the hollow conductive substrate is a cylinder, and its hollow part is used to connect an air compressor to facilitate the injection of air or oxygen; the material of the hollow conductive substrate is a conductive carbon-based material; the catalyst is CuFeN / C composite catalyst; the cladding layer is a perovskite ceramic-based oxygen ion conductor.

[0042] The preparation process is:

[0043] (1) Add copper phthalocyanine and iron phthalocyanine to anhydrous ethanol solvent to make a solution, put the carbon-based material as a conductive substrate in the solution system for a period of time, and then evaporate the ethanol solvent under the protection of argon. Take out the remaining carbon-based material for later use; the molar concentration of the solution is 10mol / L, and the molar ratio of copper phthalocyanine to iron phthalocyanine is 1:1; the soaking time is 3h;

...

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Abstract

The invention provides an air electrode of a lithium air battery and a preparation method thereof. The air electrode comprises a hollow porous conductive substrate, a catalyst and a coating layer. Theair electrode is mainly prepared by immersing the carbon-based material of the conductive matrix into a mixed solution of copper phthalocyanine, iron phthalocyanine and absolute ethanol, then evaporating and drying the ethanol to take out the carbon-based material, uniformly applying the ceramic slurry on the surface of the carbon-based material, preheating at a low temperature, treat at a high temperature and performing washing and drying after heat preservation. A surface of the hollow electrode is coated with a uniform and compact layer of ceramic-based oxygen ion conductor, and the reaction rate of the lithium-air battery can be further controlled by adjusting the thickness of the ceramic film, so as to prevent the internal temperature of the battery from being too high due to the reaction too fast and improve the cycle stability of the battery. The invention can effectively suppress the side reaction of the lithium peroxide disproportionation caused by the catalyst and solve theproblem of the lithium peroxide blocking the positive electrode channel.

Description

technical field [0001] The invention relates to the field of air batteries, in particular to the preparation of an air electrode, in particular to an air electrode of a lithium-air battery and a preparation method thereof. Background technique [0002] With the gradual depletion of fossil energy such as oil, coal, and natural gas and the increasing environmental problems caused by the greenhouse effect, it is increasingly urgent to develop clean energy and its application technology. The development of clean energy electric vehicles and hybrid vehicles to reduce greenhouse gas emissions such as carbon dioxide has become an inevitable direction for the development of the automotive industry today. High energy density, high power, high safety, and good environmental adaptability (such as working in high temperature, humidity, and vibration environments) are the must-have conditions for automotive power supplies. As a representative of the next generation of new energy sources...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M12/08
CPCH01M4/8605H01M4/8657H01M4/88H01M12/08Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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