A kind of high-efficiency lithium-air battery air electrode carbon material and preparation method thereof

A lithium-air battery and air electrode technology, which is applied in the direction of fuel cell half-cells and primary battery-type half-cells, can solve the problems that are not suitable for lithium-air batteries, and achieve the effect of improving electrochemical performance and good conductivity

Active Publication Date: 2018-02-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nitrogen-doped carbon materials have been widely used in fuel cells, but most of the materials are deposited in dots or islands, which is not suitable for lithium-air batteries.

Method used

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  • A kind of high-efficiency lithium-air battery air electrode carbon material and preparation method thereof
  • A kind of high-efficiency lithium-air battery air electrode carbon material and preparation method thereof
  • A kind of high-efficiency lithium-air battery air electrode carbon material and preparation method thereof

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preparation example Construction

[0049] The preparation method provided by the invention comprises the steps of:

[0050] (i) adding a nitrogen-containing precursor on the surface of the carbon material of the support layer, so that a polymerization reaction occurs on the surface of the carbon material of the support layer;

[0051] (ii) After the polymerization reaction is completed, perform high-temperature carbonization treatment to obtain the air electrode carbon material;

[0052] Another preparation method provided by the invention comprises the steps of:

[0053](i') fully mixing the carbon material of the support layer with a nitrogen-containing precursor to obtain a mixed material;

[0054] (ii') performing high-temperature carbonization treatment on the mixed material obtained in step i') to obtain the air electrode carbon material.

[0055] The present invention realizes a controllable preparation method of the functional layer / support layer material, that is, an all-covering synthesis method, wh...

Embodiment 1

[0062] 1.1 Preparation of composite carbon material 1

[0063] Weigh 1.0g commercial carbon material Ketjen black (KB-EC600JD) (specific surface area 2672m 2 / g) into methanol, stirring-ultrasonic dispersion to obtain a uniform Ketjen Black methanol suspension, and put the beaker containing the suspension into an ice-water bath. Then add 1.2 g of aniline to 0.5 mol / L sulfuric acid solution to form a sulfuric acid solution of aniline, and at the same time prepare a sulfuric acid solution of ammonium persulfate (molar ratio 1:1), and add them dropwise to Ketjen Black methanol suspension. After stirring and reacting for 6 hours, the product was suction-filtered and vacuum-dried at 60° C. to obtain a polyaniline-ketjen black composite material. The synthesized composite material was transferred to a crucible, and sintered in a tube furnace at 900° C. for 3 hours under a high-purity nitrogen atmosphere to obtain a composite carbon material 1 .

[0064] The X-ray photoelectron spe...

Embodiment 2

[0075] Weigh 0.5g KB-EC600JD and add it into methanol, stir-ultrasonic dispersion to obtain a uniform suspension of Ketjen Black in methanol, and put the beaker containing the suspension into an ice-water bath. Then add 3.0 g of aniline to 0.5 mol / L sulfuric acid solution to form a sulfuric acid solution of aniline, and at the same time prepare a sulfuric acid solution of ammonium persulfate (molar ratio 1:1), and add them dropwise to Ketjen Black methanol suspension. After stirring and reacting for 6 hours, the product was suction-filtered and vacuum-dried at 60° C. to obtain a polyaniline-ketjen black composite material. The synthesized composite carbon material was transferred to a crucible, and sintered in a tube furnace at 900° C. for 3 hours under a high-purity nitrogen atmosphere to obtain a composite carbon material 2 .

[0076] The preparation of the air electrode, the assembly of the lithium-air battery, and the charging and discharging test methods are the same as i...

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Abstract

The invention discloses a high efficient air electrode carbon material of a lithium-air battery and a preparation method thereof. The air electrode carbon material has a composite structure, and comprises a support layer made of carbon and a catalytic layer made of carbon, wherein the catalytic layer completely or partially covers the support layer. The composite structure maintains the micro-porous structure and good conductivity of the carbon material of the support layer, and has the catalytic performance of the carbon material of the catalytic layer at the same time, so the electrochemical property of the lithium-air battery is prominently improved, and the primary discharge capacity is improved by 30% or more. The invention further provides a controllable preparation method of the air electrode carbon material. A composite electrode carbon material with a controllable catalytic layer thickness, nitrogen-carbon structure, and nitrogen content can be obtained by the provided preparation method, which has the characteristics of low cost and simple technology process.

Description

technical field [0001] The invention relates to the field of batteries, in particular to the field of lithium-air batteries, and in particular to an air electrode carbon material. Background technique [0002] Li-air battery is the energy storage device with the highest theoretical energy density, and it is the development direction of chemical power source. Its positive electrode active material is oxygen, which comes directly from the air and is inexhaustible. Even if it is used on a large scale, there will be no resource crisis; the negative electrode active material is metal lithium, with the highest capacity, which can reach 3.81Ahg -1 , the reaction potential is only slightly higher than that of the calcium metal system. Therefore, lithium-air batteries have the potential to achieve 1000Whkg -1 The above device energy density is close to that of gasoline. Under this energy density, the cruising range of electric vehicles can reach more than 600 kilometers. In addit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M12/06
CPCH01M4/96H01M12/06
Inventor 方燕群林欢刘杨王德宇刘现军
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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