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A positive electrode for lithium-air battery and its preparation and application

An air battery and cathode technology, which is applied to battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc., can solve problems such as blockage, increase the actual quality of electrode materials, and reduce mass transfer effects. , to achieve smooth oxygen transmission, improve operating current density, and maintain the effect of transmission

Active Publication Date: 2016-01-13
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 introduction of carbon paper increases the actual mass of the electrode material. On the other hand, as the discharge progresses, some of the pores constructed of carbon fibers will still be blocked by discharge products, reducing the mass transfer effect.

Method used

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  • A positive electrode for lithium-air battery and its preparation and application
  • A positive electrode for lithium-air battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1) Combine KB600 with CaCO 3 (particle size 30-50nm) mixed with ethanol at a mass ratio of 3:1, and added PTFE to obtain electrode slurry, wherein the mass fraction of PTFE in solid matter is 20%, and the mass ratio of solid matter to solvent is 70 mg solid / ml solvent; the electrode slurry is rolled to obtain a sheet electrode, and dried at 70 degrees Celsius to obtain an electrode;

[0051] Use a 2016 button battery case as the battery package, place the lithium sheet, the electrolyte diaphragm material celgard2340, and the electrode on the negative electrode case of the battery in turn, and drop the electrolyte solution 1MLiPF on the electrode 6 Propylene carbonate solution, until the electrode and membrane are completely infiltrated, place the electrode positive shell (holes on the surface of the positive shell to transmit oxygen). Press the above components together on the button battery sealing machine to complete the battery assembly.

[0052] 2) Prepare electro...

Embodiment 2

[0059] 1) Dissolve polyvinylidene fluoride in DMAC solvent and stir at a temperature of 30 degrees Celsius until the polymer is completely dissolved to form a solution with a mass concentration of 10%.

[0060] Add KB600 to the above solution, wherein the mass ratio of conductive porous material to organic polymer is 7:3, add DMAC, adjust the mass ratio of solid matter to solvent to 100mg solid / ml solvent, stir evenly to obtain electrode slurry,

[0061] The solution was coated on a glass substrate with a flat surface using a coating doctor blade with a thickness of 400 um. The coated slurry was volatilized in the air for 2 minutes, and then quickly immersed in water for 60 minutes to solidify to form an electrode containing a pore-building organic material. Immerse the above electrode in ethanol, let it stand for 1 hour, take it out and dry it at room temperature, and then dry it in a vacuum oven at 40 degrees Celsius to obtain the desired electrode.

[0062] 2) Prepare elec...

Embodiment 3

[0067] 1) Dissolve polyacrylonitrile in DMSO solvent, stir at a temperature of 30 degrees Celsius until the polymer is completely dissolved to form a solution with a mass concentration of 10%,

[0068] Add KB600 to the above solution, wherein the mass ratio of the conductive porous material to the organic polymer is 7:3, add PVDF, the mass fraction of PVDF in the solid matter is 20%, add DMSO to adjust the mass ratio of the solid matter and the solvent The ratio is 100mg solid / ml solvent, stir evenly to obtain electrode slurry,

[0069] The solution was coated on a glass substrate with a flat surface using a coating doctor blade with a thickness of 400 um. The coated slurry was volatilized in the air for 2 minutes, and then quickly immersed in water for 60 minutes to solidify to form an electrode containing a pore-building organic material. Immerse the above electrode in ethanol, let it stand for 1 hour, take it out and dry it at room temperature, and then dry it in a vacuum ...

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Abstract

The invention relates to an electrode for a lithium-air battery or a lithium-oxygen battery and a preparation method thereof. The electrode is mainly composed of a conductive porous material and an insulating material for constructing pores, and the mass ratio of the two is 5:1-1:1. During the whole discharge process of the battery, since the electrochemical reaction cannot be carried out on the surface of the insulating material, the pores constructed by it will not be blocked by solid discharge products, and can always be used as a dissolution and diffusion channel for the reactant oxygen, thus, it can be greatly improved. The space utilization of the entire electrode improves the battery discharge capacity.

Description

technical field [0001] The invention relates to a positive electrode in the field of lithium-air batteries or lithium-oxygen batteries, in particular to the composition of the electrode materials. Background technique [0002] Lithium-air battery is a rechargeable secondary battery with metal lithium as the negative electrode and air electrode as the positive electrode. The theoretical specific capacity of the negative electrode lithium is as high as 3,862mAh / g, and the oxygen as the positive electrode active material can be obtained directly from the air. Therefore, lithium-air batteries have extremely high specific capacity and specific energy. Taking lithium as the standard, its theoretical specific energy density can reach 11,140Wh / Kg. Taking the full battery as the standard, its actual specific energy density is expected to reach 10 times that of existing lithium-ion batteries. It has great application prospects in civilian and military fields. The future commercializa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/08
CPCH01M4/8605H01M4/8652H01M4/88H01M12/08Y02E60/10
Inventor 张华民张益宁张凤祥李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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